Kỹ thuật tạo PDF từ INDESIGN, AI, Corel,PTS

K thut to PDF t INDESIGN, AI, Corel, PTS

T khi Adobe ng ca Pagemaker 7.0 pht trin Indesign, Indesign tr thnh mt phn mm tiu biu vi gii thit k - in n, Indesign vi nhng chc nng cc mnh. Phn mm l s kt hp hon ho gia AI, Photoshop, tch hp hon ton cc chc nng dn trang ca Pagemaker khin INdesign rt nng ng cho thit k - in n. Indesign kt hp thnh cng tt c cc hiu ng ca cc phn mm thit k ca hng Adobe khin cho vic thit k nhanh chng. V d ta c th Place file photoshop c y cc layer vo Indesign khi ta c th quay tr v Photoshop sa li hnh nh cn layer. Hoc c th v xong t AI, sau place trc tip file AI vo Indesign. Indesign vi nhng tnh nng mnh m y Quarkxpress vo con ng theo nh gi ca gii chuyn mn th rt d b thay th. V d nh google serch v yahoo search. Nh vy to file PDF chun t Indesign mang i in n l mt vn tng chng nh n gin nhng t ra mt file PDF chun t Indesign chng ta s thc hin theo cc bc di y:

1/ u tin chng ta s chun ho mi trng lm vic vi vic dnh ngha li khng gian qun l mu ging nh bn AI. Ch bc ny phi thc hin v nu khng thc hin thao tc ny bn s rt d b sai mu trong file PDF, v lc file PDF c th b gn ICC profile m chng ta khng mong mun. Bc ny lm 1 ln duy nht, Indesign s ghi nh cho nhng ln m phn mm ny ln sau. Bc 1: M file Indesign bt k ----> Chn Edit -> Color setting

Ch bn - xut phim - ghi km

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Bc 2: Chn Emulate Adobe Indesign 2.0 CMS Off - Mc ch tt qun l mu trnh gn ICC mu khng mong mun cho file PDF


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2/To Present (To mt Style xut thnh PDF - ln sau mi khi to file PDF ta ch cn chn kiu xut Present v lu thnh PDF l xong) + Bc 1: M file Indesign bt k

+ Bc 2: Chn File --> Export chn ni cha file PDF v chn Save as type: Adobe PDF (*.PDF)


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+ Bc 3: Thit lp cc thng s theo cc bng di y ( y ti ly ton b thng s thit lp t AI v Indesign v AI cng hng Adobe nn cch thit lp t bc ny ging nhau) ----> Xem thm link K thut to PDF t AI (Adobe Illustrator CS4) * Mc General:


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* Mc Compression:


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* Mc Mark and Bleed: Nu bn nh ngha ng kch thc cha xn th bn bleed l 0, nu cha nh ngha cha xn th bn khai bleed 2 mm khi to file PDF c d xn khi xn trnh h trng.


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* Mc Ouput


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+ Bc 4: Save thnh mt Present V d: VIETNAMPRINT (hay cn gi l Style) sau ny mi khi cn xut thnh PDF ch cn chn Present ny xong, khng cn phi thit lp li na cc thng s nh trn( bn ch cn lm 1 ln duy nht trong cuci v Present ny s tn ti mi mi. Lu : Khi ghost my nh to li Present nhe)


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3/ Lu bt k file Indesign no ch cn chn Present va to l VIETNAMPRINT


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K thut to PDF t AI (Adobe Illustrator CS4)

Trong bi vit ny chng ti xin cp n k thut to PDF t AI (Adobe Illustrator CS4). Trcy thng khi mun ra mt file PDF ngi ta hay i theo hng in thnh file PS t cc my in o, sau Disttiler mt file PDF. V file PDF ny s c flatten trong qu trnh to ra PDF.

Chnh v vic Flatten s dn n mt s hu qu khng mong mun, v d nh file c hiu ng Transperncy t khi trong qu trh flatten c ch no nm di i tng transperency s dn n hin tng b gai khi in v b convert thnh bitmap trong qu trnh flatten. Nhng vi th h RIP c th y l gii php an ton nht v kh Rip no cng hiu ht c tt c cc hiu ng chng cht trong file thit k nh : Transprency, Len, T l tng Transprency trn nn mu spot (mu pha)...

Khi PDF Engnie ra i vi vic cng b PDF Print Engine, Adobe ln k hoch cho ngy v hu ca P (tc l phng php Disttiler file PS to thnh PDF) s b xo s. KHi Rip dng PDF Engnie th RIP s flatten trong qu trnh bin dch m s gi nguyn tng i tng trong file PDF.

Nh vy vi AI lm th no to c mt file PDF chun, file PDF khng ph thuc vo thit b v thch vi cc RIP c PDF Engnie. Chng ta bt u vo bi K thut to PDF t AI (Adobe Illustrator CS4). 1/ u tin chng ta s chun ho mi trng lm vic vi vic dnh ngha li khng gian qun l mu.

Ch lm duy nht cho 1 ln v xi mi mi. (Ch cc bn hay ln mng vc th c bn ghost win th sau mi l nh chun ho li mi trng lm vic. trnh vic nhiu khch hng gp chng ti ni ln ny lm PDF nhng thng sau file mi lm t tip li b sai mu. Chng ti c tm hiu v bit c my mi c GH trc khi to PDF nn cc thng s thit lp trc u b hu). Bc 1: M file AI bt k ----> Chn Edit -> Color setting


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Bc 2: Chn Emulate Adobe Illustrator 6.0.

2/To Present (To mt Style xut thnh PDF - ging nh cc bn lm quark, Indesign hay chn Sty


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nh dng text cho nhanh) + Bc 1: M file AI bt k

+ Bc 2: Chn File --> Save as: chn ni cha file PDF v chn Save as type: Adobe PDF (*.PDF)


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+ Bc 3: Thit lp cc thng s theo cc bng di y * Mc General:


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* Mc Compression:


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* Mc Mark and Bleed


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* Mc Ouput


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+ Bc 4: Save thnh mt Present

V d: VIETNAMPRINT (hay cn gi l Style) sau ny mi khi cn xut thnh PDF ch cn chn Present n khng cn phi thit lp li na cc thng s nh trn( bn ch cn lm 1 ln duy nht trong cuci v Pres s tn ti mi mi. Lu : Khi ghost my nh to li Present nhe)


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3/ Lu bt k file Ai no ch cn chn Present va to l VIETNAMPRINT


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NH vy l bn c 1 file PDF ng chun mang i in, do bi vit c gii hn nn nu cn tm hiu th khai bo cc thng s trn xin vui lng lin h Cng ty c phn in Vit Nam (vietnamprint) vi [email protected] c h tr nhanh nht v mt k thut v thi gian in


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K thut to PDF t COREL

(COREL X3/X4/X5)

Trong bi vit ny chng ti xin cp n K thut to PDF t COREL (COREL X3/X4/X5). Bt u phin b 10, khi nimPublish thnh file PDF xut hin nhng t ai dm xi, v vo thi im ny RIP hu nh chy nhiu, cc hiu ng Transprency, Len... Rip khng h tr hon ton.

Do nu Publish ng ngha vi vic bo tn Transprency v vic bo tn ng ngha vi RIP (xut phim (CTP) khng hiu ---> Xut ra b bung hnh nh, mu sc km cht lng.

Do Corel b mang ting vi chc nng PUBLISH TO PDF. v ai ai Vietnam khi ni n PUBLISH PDF ca th ni "ng xi coi chng b h file", t chc nng ny coi nh b qun lng.

K t khi PDF Engine ra i vi chc nng bo tn ton b cc i tng trong qu trnh RIP khin Publish P thnh mt tiu im trong vic xut thnh PDF. Tuy nhin cng t ngi dm xi chc nng ny.

Qua bi vit K thut to PDF t COREL (COREL X3/X4/X5), chng ti s hng dn bn lm file PDF chun Corel mang i xt film hay CTP

Trc khi xut thnh PDF chng ta lun lun phi kim tra h mu ca file l CMYK trong Infomation ca Cor bit chc chn ton b h mu l CMYK Chng ta bt u nh: 1/ M file corel ----> File--> Publish to PDF


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2/ Bm lnh chn Setting hiu chnh cc chc nng khi to PDF


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3/ Hiu chnh cc thng s theo hng dn di y to c file PDF chun v khng ph thuc v b t Corel * Hp thoi General


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* Hp thoi Color: Corel cho 2 ty chn cho in n: 1- Chn Output color as: Native: nu mun Corel gi nguyn mi thuc tnh mu sc trong file thit k


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2- Chn Output color as: CMYK v embed color profile ( embbed profile ny vo bn phi vo color managerment v nhng profile ny vo)

Vi chc nng ny khi xut thnh PDF nu trong file thit k c mu pha (mu spot) hay RGB, Corel s t n convert mu sang CMYK vi ngi bin dch cho qu trnh convert l U.S. Web Coated SWOP v2. chn profile ny bn phi vo tools --> Color Managerment --> Color Setting


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Sau chn profile ny: U.S. Web Coated SWOP v2


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Tuy nhin chng ti vn khuyn bn hnhnh v mu sc trong file thit k lun l CMYK v d g i na conver ICC tuy chnh xc nhng i khi mt s mu sc vt khi ngng mu th convert cng khng c chnh x Nht l i vi nhng mu sng.


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* Hp thoi Document


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* Hp thoi Object:


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* Hp thoi Prepress:

Chn bleed l 2 mm Corel trn nn khi to PDF mc ch ca vic bleed l cha d ra khi kh thnh phm thnh phm l 20x 28 cm th file c bleed l 20,4 cm x 28,4 cm khi in xong ct khng b h trng) Nu bn xut ng thnh phm l 20x28 cm th chc chn khi mang n nh in h s tr bn mang file v lm


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4/ kt qu khi to ra file PDF v m bng phn mm Acrobat.


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6/ Chp file PDF ny mang i in...m khng s nh in bt mang v lm li.


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K thut to PDF t QuarkXPress (QuarkXPress 6,QuarkXPress 7, QuarkXPress 8)

Ly cm hng t nim am m sng to thit k ca cc nh thit k v cc i hi v mt k thut ca in n t cu,QuarkXpress phin bn 8 ra i b sung thm nhiu tnh nng mi gip vic thit k din ra nhanh chn vi l k thut to PDF t Quarkxpress cho php to ra file PDF nhanh hn, ng tin cy hn cho cc thi c bit khng flattened transparency c th tch hp tt vi h thng ch bn chuyn nghip c tch h ngh Adobe Print Engine.

K t khi PDF Engine 2 ra i vi chc nng bo tn ton b cc i tng trong qu trnh RIP khin Expo PDF trongQuarkXpress tr nn n gin cho tt c cc nh thit k cng nh cc chuyn vin phng ch bn Qua bi vit K thut to PDF t QuarkXPRESS (QuarkXPRESS 6/7/8), chng ti s hng dn bn lm chun t QuarkXpress mang i xt film hay CTP Trc khi xut thnh PDF chng ta lun lun phi kim tra h mu ca file l CMYK trong Utilities -> Usage 2 yu t: + Hnh nh ton b c link OK cha + Kim tra font ch nhng ht vo file cha Sau khi kim tra ton b nhng thng tin trn, chng ta bt u xut PDF t QuarkXpress:

Bc 1: M file QuarkXpress t phn mm QuarkXpress


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Bc 2: Chn File --> Export --> Layout as PDF


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Bc 3: + Chn ni lu file PDF v t tn file. + Chn OPTION hiu chnh c file PDF chun t QuarkXPRESS


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Bc 4: hiu chnh th Page:

+ Spreads: Cho php xut trang i t QuarkXPRESS, nu b chn s xut trang PDF n nhng nm tro PDF duy nht (v d: file lynhaky.pdf c 100 trang trong )

+ Export pages as separate PDFs: Cho php sau khi xut ta c tng trang PDF ring l mi file l mt tran nh lynhaky(Page 01).pdf,lynhaky(Page 02).pdf...lynhaky(Page 100).pdf +Include Blank Pages: In km theo c trang trng, nu b chn QuarkXpress s b trang trng i +Embed Thumbnail: to thumnail cho PDF


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Bc 5: Mc Compression: + Compression Chn None khng nn file PDF m bo cht llng ng nh file gc + Resolution: Keep Resolution gi nguyn phn gii ca file gc.


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Bc 6: Chn Color c 4 mode mu: + Grayscale: Chuyn sang en trng + RGB: Xut xem trn mn hnh hay ra nh + CMYK: In n OFFSET + CMYK v SPot: Nu xut 4 mu in n CMYK v km theo mu th 5 mu pha (mu PANTONE) + As is: Gi nguyn tt c cc thuc tnh mu c trong file QUarkXpress


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Bc 7: Xut xong chng ta c file PDF xem phn mm Acorbat


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Bc 8: Mang file PDF xut t QuarkXPRESS mang i in n. File PDF mang i in n c cht cao v ng ti ph hp vi h thng c tch hp Adobe Engine


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K thut to PDF t PHOTOSHOP (Adobe PHOTOSHOP CS4)

Trong bi vit ny chng ti xin cp n k thut to PDF t PHOTOSHOP (Adobe Photoshop CS4). Tr thng thng khi mun ra mt file PDF t Photoshop ngi ta hay i theo hng chnh sa hnh nh sau vo AI, Corel, Indesign, Freehand. Sau t mi xut thnh PDF. l con ng vng v mt rt nh gian. Vietnamprint xin gii thiu n cc bn phng php to PDF trc tip t Photoshop vi cht lng dng mang i xut FILM hay xut CTP.

Trc khi xut thnh PDF chng ta lun lun phi kim tra h mu ca file l CMYK v phn gii hnh t l 300 dpi, hnh khng b rng ca th file hnh nh ny mi dng in n c Chng ta bt u nh: 1/ M file hnh nh t Photoshop:


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2/ Bm lnh File ---> save as.

Nh tt ICC profile v nu dng ICC Profile chng ta phi rt hiu v n, cn nu khng s gy ra hiu qu m khng nh mong mun.

3/ Hiu chnh cc thng s theo hng dn di y to c file PDF chun v khng ph thuc v b t Photoshop * Hp thoi General


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* Hp thoi Compression


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* Hp thoi Output

4/ kt qu khi to ra file PDF v m bng phn mm Acrobat.


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6/ Chp file PDF ny mang i in...m khng s nh in bt mang v lm li.


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K thut overprint vi Corel, AI

Vi Corel

Chn i tng vietnamprint.vn cn Overprint (Fill hoc Outline) ri click phi chut phi ln mn hnh chn O Fill hoc Outline

Vi AI Vo Menu Window\ Attributes (Ctrl+F11) Chn i tng vietnamprint.vn cn overprint. Nu cn overprint fill (mu t) th check vo option Overprint nu cn overprint mu vin th chn overprint stroke nh.


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Ghi ch nu mang nhng file c overprint i xut phim th cc bn phi bo vi nhng ni xut phim ha trnh h b OVERPRINT CA MNH I LU PHI CHU TRCH NHIM VI NHNG I TNG BN CHN OVERPRINT. LC IN RA NHN MI THY KT QU ==> V CNG NGUY HIM

(v hu ht cc nh in trong TPHCM u dng overprint black, knock out other: Ngha l ch overprint m cn nhng mu khc u mc ra trnh in ra mu sc khng ng nh trn thit k) Ngun: Vietnamprint


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K thut xut Corel thnh JPG - Mang i ra nh?

Nhn c file Corel c khch hng a. lm sao xut thnh file JPG mang i ra nh hay vo Photoshop chnh li hnh cho p. K thut ny kh n gin nhng i vi cc bn mi bc vo ngnh ha th l mt vn ln. vi phng chm "in n cho mi ngi", nhng kin thc cn bn ny mong s gip cc bn rt nhiu trong cng vic.

Bc1: M file Corel t phn mm Corel, r chut chn i tng cn xut thnh JPG. Nu mun xut ht tt c bn chn CTRl-A

Bc2: Chn file -> export


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Chn nh dng file l JPG-JPEG Bitmaps. Chn select only vi mc ch ch xut ring i tng c chn t bc 1


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Bm export -> Bng lnh hin ra: Chn: +Color model: RGB mang i ra nh

+Quality: cht lng hnh nh highest l cao nht, nu xut ch xem trn mn hnh hoc website th


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bn chn lowest file JPG nh nht. Ch mang ra nh chn highest hnh p nht, chi tit.


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Pdf/X l g? nh dng PDF trong in nVi vic cng b PDF Print Engine, Adobe ln k hoch cho ngy v hu ca Postscript v ngy nay nh dng file pdf ch thnh nh dng file c s dng rng ri nht trong ngnh cng nghip in. Nhng file pdf nh th no l file pdf c th in c? Cu hi ny bt c ngi lm ch bn no cng t ra v khng t ln phi vt ln vi cc file pdf khng ph hp do khch hng a n. nh dng file pdf (portable document format) nh nguyn thy ci tn ca n l mt nh dng file c to ra t nhiu chng trnh ngun khc nhau, trn nn cc h iu hnh khc nhau u c th c xem v in ti ngi nhn. Nhng thi k u pdf c thit k ch yu cho mi trng vn phng, ngy nay pdf c th l mt file phc v vic xem trn mn hnh vi cc ch gii, hnh nh chuyn ng, bn mu.v.v cho ti cc file PDF/X-3 vi phn gii cao. PDF/X th c th ch bn c cn pdf thng thng th khng th hay ni cch khc l vi cht lng hn ch. PDF/X Vic s dng PDF cng ngy cng ph bin trong ngnh cng nghip in v nh vy xut hin nhu cu phi phi nh ngha file PDF nh th no l file PDF in c hay s dng c trong ch bn. Cc t chc nh DDAP (Digital Directions in Applications for Production) v NAA (Newspager Association of Armerica) nhn thy vn ny t rt sm v yu cu CGATS ( Committee for Graphic Arts Technical Standards) pht trin mt tiu chun chung t nhng nm 90, Kt qu l PDF/X-1 trong X c ngha "exchange" nhng bn cht vn khng ngoi nh dng PDF ca hng Adobe.


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Lu PDF/X-4 vi Acrobat 8 mt file c coi l ng chun PDF/X-1 th tiu chun ny ch nh ngha nhng th khng c php c trong file PDF, V d PDF/X-1 khng c php c nh km attachments hay annotations, hoc khng cha hnh nh khng gian mu RGB hay CIELab. Mt khc PDF/X-1 khng nh ngha r phn gii cn thit ca hnh nh. iu ny c nh ngha cc ch kim tra trc khi in (preflight hay PDF profile). PDF/X-1 nhanh chng c coi l tiu chun trong ngnh in v nm 2001 c cng nhn l ISO standard s 15930-1, nhng nm tiu chun ny c sa cha v cp nht sau khi i tn thnh PDF/X-1a. Hai nm sau li mt t cp nht na v nh vy chnh xc ta cn bit nm ca chun PDF/X-1a, v d PDF/X-1a phin bn 2003.


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Tt c mi ch bt u vi cc chun PDF/X. Trong khi PDF/X-1a c s dng rng ri trong vic trao i d liu ch cha hnh nh CMYK v mu spot th nhu cu x l hnh nh RGB v CIELab hay phi lm vic vi OPI hay DCS file vn tn ti. Hai phin bn mi cho PDF/X c son tho, PDF/X-2 chp nhn cc file DCS vi nhiu knh mu (Desktop Color Separations, c pht trin bi Quark nm 1989) v PDF/X-3 chp nhn hnh nh RGB v CIELab nhng khng c DCS v OPI. Ch c mt trong hai chun trn c chp nhn l PDF/X-3 v ch thnh chun ISO s 15930-2 vo nm 2003 PDF/X-3 cho php thc hin cc tc v ti bt k thi im no trong qu trnh x l file trong mt workflow (late binding process). C ngha l ta c th chuyn qu trnh tch mu chuyn i RGB sang CMYK ti RIP. lm c iu ny cc hnh nh trong PDF/X-3 phi c nhng km ICC profile ca khn ggian ngun v ICC ca qu trnh output cng phi c nhng. Mt khc phn gii hnh nh vn khng c nh ngha nhng c th lm vic c trong cc preflight profile. PDF/X-2 khng c cng nhn chun ISO v cng khng c s dng rng ri. iu ny hi l v chun ny rt l tng cho cc ngnh bao b vi vic in nhiu mu hn l ch c CMYK. File DCS l mt la chn v kh nng multicolor. Tt nhin l qu trnh x l cc file multicolor trong bao b rt phc tp nn cc nh in bao b vn tip tc s dng cc nh dng chuyn bit ca Illustrator, InDesign v QuarkXPress thay v hng dn khch hng cch dng PDF/X-2. PDF dng trong ch bn Ghent PDF Workgroup

Khi phi nh ngha lm cch no kim tra file PDF (Preflight) v to ra file PDF 100% s dng c trong ch bn th c mt t chc ng trn tt c. l GWG Ghent PDF WorkGroup hot ng t nm 2002. Tt c cc nh cung cp phn mm Preflight v rt nhiu nh in , xut bn l nhng ngi dng PDF ch yu l thnh vin ca GWG v cng b mt series cc preflight profile cho cc lnh vc ng dng khc nhau. D bn dng phn mm Preflight no, v workflow bn ang dng l g bn lun c th tm thy cc preflight profile c th nghim v kim chng download ti www.gwg.org. Trong nhiu chng trnh cc thng s preflight thng c gi l PDF profile v trong phn gii cn thit phi c nh ngha cho phng php in tng ng. Hin nay GWG tp chung vo qun tr mu (ColorManagement) trong file PDF chnh v vy GWG v ICC l hai t chc quan trng khi ta quan tm n qun tr mu, cht lng in. Hin nay Quark 7.0 v Adobe a ra Acrobat 8.0 nn cng l mt tng tt khi ta ng dng cc PDF profile trong cc ng dng ny. Kt xut ra file PDF t Microsoft Office 2007

Tt nhin l chng ta thy qu phc tp vi cc chun PDF/X khc nhau. N cn t hn na khi bit rng ngy nay PDF/X ch h tr hon ton PDF 1.3 v phin bn 2003 c h tr mt phn PDF 1.4 ( nhng khng c layers v transparency). Ni mt cch n gin th PAF 1.3 ch h tr cc c tnh ca postscript 3 cc tnh nng nh layers, transparency ca PDF 1.4 hay mi hn l PDF 1.7 khng c h tr mt cch trc tip vi postscript 3 RIP.


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Khi cc file ny cn phi flatten (chuyn layer hay transparency thnh mt lp) x l. H tr trc tip PDF 1.6 hay PDF 1.7 chi c duy nht PDF Print Engine mi ca Adobe hay cc ng dng dng PDF Library x l nh ca Artwork System, Esko-Graphics v Global Graphics). Nh vy vic ng dng trc tip PDF 1.6 hay 1.7 phi i n cui nm 2007 v khi chng ta cn mt tiu chun mi cho cc file PDF ny v lm cho chng tht s in c trong ch bn. Mt chun mi cho PDF/X ang c chun b bt u vi PDF/X-4 . Acrobat 8.0 c preflight profile da trn chun PDF/X-4 d tho cho 3 iu kin in khc nhau. Tt nhin l chng ta vn phi bng lng vi PDF/X-1 v PDF/X-3 cho n khi PDF/X-4 c cng nhn l chun ISO vo cui nm 2007. Mc d mi nhn cc chun PDF/X c v nh lc vo rng rm nhng tht ra n c logic v b qua cc file PDF/X th cn t hn l khi tm hiu k cng v n. Nu b qua cc chun PDF/X c ngha l chng ta b qua cc kh nng kim sot cht lng v cho php bt k file PDF no cng em in vi cht lng khng lng trc c.

Ngun: Vietnamprint (Bi dch t www.gwg.org)


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Trapping trong in n Khi thc hin cc n phm c bit l cc n phm bao b, nhng ngi thit k gp khng t kh khn v lng tng khi phi x l nhng vng b l trng gia cc vng chng ln cc mu. i khi v cc hin tng ny m chng ta phi hao tn nhiu cng sc, thi gian v tin bc lm li. Bi vit ny nhm mc ch gip cc bn quan tm tm hiu thm v vn ny v mt s bin php khc phc TRAPPING L G? Trapping l vng chng ln c ch gia cc mu trong mt vng in khc phc cc li khng th trnh c trong qu trnh in. Trapping cn c nhiu tn gi khc nh m rng v thu hp(spreads and chokes), m hn v mnh hn (fatties and skinnies), co li v gin ra (shrink and spread)

TI SAO PHI THC HIN TRAPPING? Trapping dc thc hin b tr nhm trnh hin tng l trng vng tip gip gia cc mu. Nguyn nhn gy ra hin tng l trng c th l: -Sai s trong qu trnh ghi phim. -Cht lng phim khng tt ( co gin ln). -Li do bnh bn. -Do co gin giy. -My in chng mu khng chnh xc do cc li v c kh hay ngay c tay ngh cng nhn yu. -Cc tc ng mi trng khc nh nhit , mcng c nh hng n chnh xc trong qu


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trnh ghi phim cng nh qu trnh in.

CC K THUT TRAPPING to trapping theo phng pghp truyn thng c th s dng thi gian chp,p phim lu hn hoc mt s k thut m rng (enlarge-cn gi l chokes) vng mu to vng chng ln cn thit. Ngy nay,cc phn mm dn trang(page layout), ha,bnh bn (imposition),hay RIP u c chc nng t ng.Thm ch c mt s hng cung cp nhng phn mm chuyn gii php trapping chmg hn nh DK&A. Trapping in t c quyt nh theo 4 loi ty theo vic trapping xy ra u. Trapping bng tay: Ngi thit k c th to trap trn mt phn mm ha nh lllustrator,Corel Draw!hay Freehand bng cch xc nh thm dng k(steoke)hoc khung vin (frame) in ln vng mu k cn.Mc d cch ny d lm, nhng n c mt s nhc im sau: -Trapping bng tay mt nhiu thii gian.Ngi thit k pah to nhng phn t ha ring bit vi nhng thuc tnh v ng vin khc nhau thit lp trap. -Trapping bng tay i hi ngi thit k phi bit c phn trm thu phng hnh ha .Chng hn mt i tng trapping vi ln l 0.5pt,nu khi t vo chng trnh dn trang,i tng thu nh ch cn 50% th ln trpping ch cn 0.25pt,nh vy ln trap c th khng t yu cu. -Ngi thit k phi to trap da trn tn s tram,phng php in,thit b ins s dng cho cng vic.Chng hn mt i tng trap vi ln 0.5pt cho phng php in offset tn s tram150 lpi,th cng ln ny chng ta c th p dng khi in bng ohng php in flexo mt tram85 lpi. Vic xc nh trapping bao nhiu lun lun l iu cn thit cho nhng ngi lm cng vic thit k.Di y l mt s thng s tham kho cho vic thit lp ln trapping ty thuc vo tn s tram,loi giy v thit b in: Phng php in Loi giy Tn s tram(lpi) trap(mm) trap(pt) In offset t ri giy couch 150 0.08 0.25 In offset t ri giy thng 150 0.08 0.25 In offset cun giy couch 150 0.10 0.30 In offset cun giy thng 133 0.13 0.40


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In offset cun giy bo 100 0.15 0.45 In flexo giy couch 133 0.15 0.45 In flexo giy bo 100 0.20 0.60 In ng ng 150 0.08 0.25 Cng thc tham kho tnh ln trap: Trap (mm) = [1/ (tn s tram * 2)] * 2.54 Trapping bng chng trnh ng dng: Phng php ny s ng cc chc nng trapping ca cc ohn mm ng dng nh QuarkXpress,Pagemaker,Corel Draw, lllustrator Phng php ny tin li nhng cng c mt s nhc im sau: i hi ngi ng dng pghi rt am hiu v phn mm ng dng,c bit l cc lnh v trap,nu khng vic trap c th lm cho kt qu tr nn ti t hn.Chng hn cu hnh v trap ca QuarkXpress gm ba mc (Automatic,Color-specific,Object-specific)m nhiu ngi s dng khng am hiu lm. -Cu hnh v trapping ca cc chng trnh ng dng ch dnh cho cc i tng to trong cc chng trnh ,kn khng c nh hng vi cc i tng nhp t cc phn mm khc.

S dng cc phn mm trapping: Chng ta c th s dng cc phn mm trapping nh Luminous TrapWise, DK&A v Ultimate TrapEze to trap cho cc file EPS sau khi chng c to bi mt chng trnh ng dng no v trc khim n uc Rip.Phng php ny c u im l c th thc hin vic trapping mt i tng phc hp.Tuy nhin,vic s dng phn mm trpping i hi mt cng an ring bit trn my v thm ch phi s dng mt mas tnh khc. S dng cc phn mm trpping trn RIP: Mt s phn mm nh Scitex Auto-Frame v RAMPAGE thc hin vic trapping ngay trn RIP.Thng chng l nhng phn mm rt mnh n nhng kh t tin, tuy nhin h dng khi chng ta s dng cng cng ngh Computer to Plate. Gii php trapping ca Scitex,Full Auto Frames(FAF), trapping im trn cc RIP postscrip level2.FAF chun ha nhng mu sc thch hp khi trapping gia nhng cp mu vi nhau,khc vi vic trapping nhng i tng ln can.FAF s t ng trapping nhng i tng v tram trong tp tin,k thut ny s lm gim tc ca RIP t 15-30% nhng kim c cc thngso trpping ng nht vi nhau rt kh kim sot. LM TH NO TRNH VIC THIT LP TRAPING?


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i vi mt s ngi trapping l mt khi mim kh hiu v kh thc hin. Trong trng hp h c th thit k mu sao cho khng cn phi trapping.C mt vi cch trnh trapping : -Overprinting(in chng,in ln): khng mc trng ng ngha vi vic khng trapping. C mt s nh thit k,to mu vi nhng mng mu in chng ln nhau. V khng c mng mc trng nn tt nhin h khng cn phi thc hin vic trapping.Tuy nhin,vi phng cch ny,ngi thit k phi hnh dung ra mu tng hp khi cc mu mc c in chng ln nhau (overprint).Chng hn khi chn ch overprint cho mt vng trn mu Cyan,bean trong mt hnh vung mu Magenta th vng trn sau khi in xong s l mu xanh tm (Blue). trnh thc hin vic trapping m vn gi mng mu hnh trn mu Cyan, mt s nh thit k thit lp mt khung vin (frame) mu en xung quanh hnht rn ny. Mc nh, thng thng mu en c ch overprint, nn luc ny khung vin ng vai tr nh trapping m h khng cn phi thit lp. Trapping t nhin :commom color

Vic lin kt kh o lo cc mu c bn l cch n gin v thng minh trnh trapping. Tt nhin , bn phi c hiu bit v mu sc v cch tng hp mu.Chng han, cng trng hp nh trn trnh trapping m khng to khung vin, bn c th cho vng trn xanh Cyan mt cht Magenta (thng l 20%). Khi , nu c xy ra hin tng l trng khi in ht vng l trng thc s khn phi l trng na m l vng 20% Magenta,mt ngi b nh la v bn khng c cm gic l trng gia hai mng mu Cyan v Magenta. Ch :Thng htng mu chn thm l mu sng hn trong cp mu ang thao tc.Chng hn, gia hai mu Yellow v Cyan, nn chn mu Yellow.Gia hai mu Cyan, Magenta chn mu Magenta. Di y l bng tham kho : Phi thc hin trapping Khng cn thc hin trapping

Mu 1 Mu 2 Mu 1 Mu 2

100C 100M 100C 20M 100M

100M 100Y 100M 10Y 100Y 10M

100Y 100C 100Y 20C 100C

100C 100Y 100M 100C 100Y 100M 20Y -i khi ngi thit k c th thit lp cc khong trng cn thit xung quanh vng tip gip cc mu


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khng phi thc hin vic trapping (design out). Ngy nay cc phn mm dn trang v ha u c trang b thm cc cu hnh gip bn c th thc hin vic trppping t ng mt cch nhanh chng.Mc d vy , thc ra chng cng khng th tha mn heat nhu cu v trapping ca tt c cc i tng.Khng c mt phn mm ng dng no, nhoi cc phn mm trap chyn nghip, c th t ng trap tt c cc phn t khc nhau trong trang thit k.Ch nhng phn t no c to bi chnh chng trnh ng dng mi c th thc hin c vic trap. Phn di y s im qua cc kh nng thc hin vic trap ca mt s phn mm ng dng thng dng. ADOBE ILLUSTRATOR Adobe illustrator c nhiu chc nng trapping trong k thut PathFinder nh: ct cp (crop), kt hp (converge) v clip paths.Trong phn mm ny, k thut trapping t ng ch c thc hin cho cc i tng khp kn (closed paths), do , vn bn phi c chun thnh ng vin (convert to outline) v cc ng v phi c chuyn thnh cc khung khp kn (convert to closed paths). Kt qu trapping lllustrator c th c lu di nh dng EPS v t vo cc chng trnh dn trang nh Pagemaker hay QuarkXpress (nn nh ng thc hin vic thu phng cc i tng ny trong phn mm dn trang v vic ny c th lm thay i kach c trpping ). Ch : lnh trap ch p dng c cho cc ti liu s dng h mu CMYK . to trapping bng cch s dng knh Trap,thc hin cc bc sau: 1.Thc hin mt trong hai bc di y: -Chn hai hay nhiu i tng, chn lnh WindowShowPathfinder(trong Pathdinder,nu biu tng trap cha c hin th, bm chut vo mi tn gc trn bean tri hin th menu , chn lnh Show Options). Sau bm chut vo biu tng Trap gc di bn phi paletle Pathfider. -Chn mt hay mt nhm i tng, sau chn lnh PathdinderTrap t menu Effect. 2.Thit lp tr s trap ph hp trong trng Thickness (bn c th thit lp tr s t 0.01 n 5000 points). 3.Nhp mt s vo trng Height/With% xc nh ln ca trap theo chiu ngang so vi chiu ng. Tr s mc nh l 100% c ngha l ln theo trap theo hai chiu ngang v ng bng nhau .Vic xc nh hai tr s trap khc nhau gia chiu ngang v chiu ng nhm b tr nhng sai leach khch quan nh gin giy chng hn. 4.Nhp mt tr s vo ng Tint Reduction thay i sc ca trap. Tr s mc nh l 40% c ngi l mu khong trap bao gm 40%mu sng hn. 5.Ngoi ra cn c cc ty chn: -Traps with Process Color: chuyn mu ca khang trap t dng mu process (mu c tng hp t 4 thnh phn mu c bn C, M, Y, K). -Reverse Traps:thc hin vic trap cc mu ti hn vo cc mu sng hn .Ty chn ny khng lm vic vi mu en c cha thm cc thnh phn mu CMY.


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6.Bm chn OK thc hin trap trn cc i tng c chn. Bm chn Defaults tr li cc tr s trapping mc nh. COREL DRAW! Trong Corel bn c mt s phng php trapping sau : C hai phng php to trapping t ng: lun lun overprint mu en (Always overprint black) v t ng m rng vng mu cn trap(auto-spreading). Tr s mc nh cho vic overprint black l 95%, ngha l cc i tng nm di mt i tng khc c cha 95 % mu en tr ln s kdng b mc trng. iu ny tht s hu dng cho cc vn bn c mu en. Ch Auto-spreading s t ng to mt ng vin (outline) xung quanh i tng cn trap, c mu ging vi mu nn ca i tng o v c thuc tnh overprint. Tuy nhin cn phi c 3 iu kin sau cho i tng cn trap : -Cha c ng vin (outline). - c t mu nn. -Cha thit lp thuc tnh overprint. a. thc hin vic trap bng cch overprint black 1. Chn lnh File/Print. 2.Bm chn trng Separations (trong hp thoi print). 3. Kch hat ty chn Print Separations. 4. Kch hat ty chn Alaways Overprint Back. b trapping bng cch auto-spreading: 1. Thc hin t bc 1 n bc 3 trong phn a trn v kch hat ty chn auto-spreading 2. Nhp tr s vo trong hp Maximum. m rng s ty thuc vo tr s trap cc i (maximum) m bn nhp trn v mu ca i tng. 3. Chn ty chn Fixed Width nu bn mun c nh b dy khang m rng. Tr s Maximum s thay i thnh Width khi bn chn ty chn ny. 4. Nhp vo tr s trong hp Text above, tr s ny xc nh co ch nh nht m Corel s bt u thc hin ch auto-spreading . Ch : bn ng nn chn tr s text Above qa nh , bi v khi cc an vn bn c co ch nh s cth b m hon bnh thng rt nhiu do chng c auto-spreading Trapping bng cch chn thuc tnh over-print cho cc i tng c chn Bn c th chn thuc tnh overprint cho cc i tng c bit no trc khi bn m hp thai print . Cc thuc tnh ny c th thit lp cho mu nn , cho ng vin hay cho c hai . Tuy nhin , cn lu l vic thit lp ch overprint cho mu nn s to cho i tng mt mu nn khi in ra t in s khc hn vi mu ang hin th trn mn hnh , bi v mu trn t in s l mu tng hp ca mu nn nguyn thy v mu nm pha di n . Mt khc khi thit lp b rng ng vin , bn nn nh rng ng vin trong corel lun lun c mt na b dy nm bean trong i tng , na cn li nn bean ngai i tng . Ngha l , nu bn thit lp b dy ng vin l 0,3 point , th thc cht trap ch l 0,15 point . trap bng ch overprint 1. s dng cng c pick tool , bm chut phi ln i tng cn trapping v chn ch overprint trn manu xung.


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2. Bn c th chn Fill hoc Outline hoc Both Quarkxpress Nh ni phn trc , trong quark chng ta c ba ch trapping bao gm : Automatic trapping c truy xut qua lnh Edit/Preferences /trapping Object-specific trapping truy xut qua lnh Edit/Color/Edit trap v Item Specific trapping truy xut qua lnh View / Trap Information Automatic Phng php Automatic trapping c p dng trn tan b ti liu , ngai tr cc i tng c thit lp trap color slpecific . ni chung , Quark thit lp tr s trap ty thuc vo mt ca mu foreground v mu blackground . Nu mu l i tng sng hn mu nn (blackground) th i tng s c m rng (spread) . Ngc li , nu mu i tng ti hn mu nn th mu nn s c m rng ( choke thu nh vng mc trng ) Phng php Automatic c hai ch : Absolute v Proportional . Absolute s dng tr s trong mc auto amount . Proportional s dng tr s da trn t l mt gi74a mu i tng v mu nn . Ngi s dng Quark cng c th xc nh tr s cho nhng mu khng xc nh ( Mu phc hp indeterminate ) . Cc i tng ng c trap vi mt nn phc hp ty thuc vo tr s ch th trong hp thai trapping preferences . Tr s t 0-36pt v bc tng 0,01pt . Mc ignore White c chn khi i tng c mt phn ln cc mu nn cn mt phn nm trn vng trng . Mc process trap trn c chn khi trong ti liu c s dng cc mu process ( mu tng hp t 4 mu c bn CMYK ) Color specific Trong lphng php ny , ngi s dng s quyt nh mi lin h gia mu i tng v mu nn . Sauk hi chn mu nn ( blackground) , ngi s dng nhp vo tr s dng trong mc trap m rng vng mu i tng hoc nhp tr s m m rng mu nn . Mt i tng cng c th in chng mu ln mu nn ( khng mc trng ) nu chnn ch overprint . Thng thng cc i tng trn trang Quark c trap theo tr s mc nh ( default ) chn trong hp thai Trapping Preferances . Nu ngi s dng mun thay i trapping mt i tng no khc i , phi chn Trap Specifications t menu view . C ba ch : Overprint, knockout , v custom. Overprint cho php in chng i tng ln mu nn . Knockout b vic trapping . Custom cho php ngi s dng thit lp tr s trap nhp vo - Black Attibute: ch yu dng thit lp cc thng s v ch -Black limit : gii hn mt tram mu en nh nht vn cho -Text below : co ch ln nht vn cn cho php Overprint. Ngun: Vietnamprint (Theo HAK) Overprint overprint


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Bnh Trang v Bnh trang in t

Bnh trang l mt thut ng, ting Php l "montage" v ting Anh l "imposition", c ngha l sp t cc phn t vo bn trong mt trang ln hn (cn gi l t mise) sau khi in, thnh phm ta c mt n phm vi cc trang theo th t quy nh. y l cng vic m cc k thut vin hoc th bnh trang phi thc hin. V vic sp xp cc trang hon chnh vo bn trong khun kh ca mt t in ln hn ph thuc vo cc c im ca qu trnh in m trong cng on ch bn l cng on tip theo nn gi bnh trang l bnh bn cng khng sai. Trc y, do phim cn t nn ngi th bnh khng ch ghp cc trang nguyn di dng nhng ming phim ln to thnh t in m cn phi sp t cc thnh phn ca mt trang in, th d nh hnh nh dn ring, ch di dng phim hay giy can c dn ring, thm ch th bnh cn phi khot phim, co phim v v thm cc phn t trong mt trang. Ngy nay, gi thnh ca phim r i nhiu v hu ht cc n phm u c thc hin trn my vi tnh nn khi nim bnh trang th cng c hiu l dn cc ming phim ln cha ng ni dung ca mt trang li vi nhau hnh thnh mt t in. Bnh trang in t l mt khi nim dng ch hnh ng sp xp cc trang hon chnh li vi nhau trn my tnh theo mt trt t v v tr no xut ra mt t phim ln hay ghi bn trc tip b qua giai on bnh trang th cng. Ti sao phi bnh trang in t? C rt nhiu cu hi c t ra trc khi mt n v s dng cc gii php bnh trang in t, tuy nhin c mt im chung nht l tt c nhng n v s dng bnh trang u mc ci khi c ai hi mnh v iu ny!. Trn thc t c rt nhiu quan nim sai lm khi cho rng (1) Ti ang bnh trang bng QuarkXpress, corel, AI. v thy kt qu tt vy ti phi dng phn mm bnh trang in t lm g? (2) Ti ch xut phim thi ch khng dng k thut ghi bn trc tip, vy ti phi bnh trang in t lm g?


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tr

li

cu

hi

ny

trc

ht

ta

phi

nhn

vo

khuynh

hng

cng

ngh.

Theo d on ca t chc Vantage th cho n nm 2008 cng ngh ghi bn trc tip (CTP) s pht trin v dn thay th cho cng ngh ghi phim (CTF). V khi ghi bn th khng th c chuyn ct cc ming bn nh ra ghp li vi nhau, do vy vic phi bnh cc trang hon chnh ghi mt lc l vic lm tt yu trong tng lai rt gn. Tip theo, gi thnh u t my ghi bn ngy cng thp v gi km CTP cng ang trn gim dn nn vic u t h thng CTP v lu di s cho hiu qu kinh t cao hn. Trong tng lai khi lu lm vic k thut s hoc cc gii php tch hp nhm t ng ha cc cng on sn xut c ng dng rng ri th vic s ha hon ton d liu l mt nhu cu tt yu v bnh trang in t gn nh l mt cng on bt buc. Nu n v sn xut ch gia cng ch bn hoc ch c my ghi phim th bnh trang in t cng mang li nhng li ch nh sau: - Rt ngn thi gian sn xut - Gim thiu cc li pht sinh do bnh th cng - Tng cht lng sn phm do bn in sch hn - Cho kh nng tnh lng mc in, nhanh chng thay i k hoch sn xut khi chuyn t ng t kiu b tr tay bnh ny sang kiu bnh khc hoc khi c nhng thay i v kh my in, kh giy hay kiu my gp Ngoi ra khi cht lng sn phm ngy cng c ch trng th cc li do khim khuyt ca qu trnh thnh phm nh tay sch bn trong b y ra khi ng lng, ni ghp hnh nh lin tc gia hai tch sch khc nhau, b tr cho xon lch tay sch khi gp dn v mt pha. cng phi c b tr v tnh ton bng cc phn mm bnh trang in t. C nhiu vn lin h cht ch gia cc phng php bnh trang in t v lu lm vic. Ngy nay ngi ta thng tranh lun nhiu v cc lu lm vic k thut s v lu s quyt nh qu trnh bnh trang in t. Mt lu lm vic k thut s ngoi yu t n nh v ph hp vi tnh hnh thc t ca x nghip, n cn phi mang tnh linh hot c th tho mn c cc yu cu a dng ca khch hng. Cc yu cu i vi chng trnh bnh trang

Cc chng trnh bnh trang phi p ng cc iu kin di y:


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-To ra v lu tr cc trang c bnh. -X l s trang cho cc bn in (k c nh dng v cch sp xp, nh ngha cc khong cha l, cha ct v cc mu ho tit trn trang). -To ra nhiu kiu bnh khc nhau cho mi t in, k c bnh cc trang lin tc v cc trang ri rc. -C kh nng bnh theo cc phng php thnh phm nh ng lng ng kp, khu ch, dn keo v cc c th ca vic thnh phm trn my in nh: in lt mt, in nhiu bng trn my in cun. -X l trn l trang v ko dn hai trang k tip nhau. -Kt hp c nhiu kiu bnh. -To v lu li cc Template s dng nhiu ln -Tnh c dy giy v dung sai ca dao ct. -T ng b tr cho cc khim khuyt ca qu trnh thnh phm. -C nhiu h thng nh v cc du point v c l ph hp vi cc iu kin in. Ngoi cc yu t thun tu v k thut nh trn, cc chng trnh bnh trang cn phi: -Tch hp cc loi d liu t cc chng trnh dn trang khc nhau vo trong mt cng vic c th. -p ng c cc quy c v cu trc ti liu PostScript. -Bin dch c cc nh dng EPS, TIFF, PDF v cc trang PICT. -Cho xem cc trang trn mn hnh cc ch hin th. -Gi li cc trang hiu chnh, thm bt hay thay i k t. -Hin th cc chi tit v t in. Ngun: vietnamprint (Theo thy Ng Anh Tun - Trng khoa in v truyn thng HSPKT)


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Kỹ thuật tạo PDF từ INDESIGN, AI, Corel,PTS

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