SE507719C2 - Ways to produce a halftone image - Google Patents

Ways to produce a halftone image

Info

Publication number
SE507719C2
SE507719C2 SE9601662A SE9601662A SE507719C2 SE 507719 C2 SE507719 C2 SE 507719C2 SE 9601662 A SE9601662 A SE 9601662A SE 9601662 A SE9601662 A SE 9601662A SE 507719 C2 SE507719 C2 SE 507719C2
Authority
SE
Sweden
Prior art keywords
stochastic
image
film
raster
light
Prior art date
Application number
SE9601662A
Other languages
Swedish (sv)
Other versions
SE9601662L (en
SE9601662D0 (en
Inventor
Bo Jemseby
Original Assignee
Bo Jemseby
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bo Jemseby filed Critical Bo Jemseby
Priority to SE9601662A priority Critical patent/SE507719C2/en
Publication of SE9601662D0 publication Critical patent/SE9601662D0/en
Priority to EP97921067A priority patent/EP0951662A1/en
Priority to PCT/SE1997/000717 priority patent/WO1997041487A1/en
Publication of SE9601662L publication Critical patent/SE9601662L/en
Publication of SE507719C2 publication Critical patent/SE507719C2/en

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F5/00—Screening processes; Screens therefor
    • G03F5/22—Screening processes; Screens therefor combining several screens; Elimination of moiré
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F5/00—Screening processes; Screens therefor
    • G03F5/02—Screening processes; Screens therefor by projection methods
    • G03F5/12—Screening processes; Screens therefor by projection methods using other screens, e.g. granulated screen
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F5/00—Screening processes; Screens therefor
    • G03F5/14—Screening processes; Screens therefor by contact methods

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Preparing Plates And Mask In Photomechanical Process (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

The present invention relates to a method of producing with the aid of exposure a screened image of a picture (2) on the light-sensitive layer (6a) of film (6), plate, etc. The characterizing feature of the invention is that it incorporates utilization of at least one stochastic screen (5). This is located before the said film (6), plate, etc., on which the said screened image is intended to be created. The toner (5a) of the stochastic screen (5) is located in direct contact with the light-sensitive layer (6a) of the said film (6), plate, etc.

Description

507 719 10 15 20 25 30 35 2 ningsriktningen sett före den ljuskänsliga filmen 6 och med sitt toner- eller svärtningsskikt Sa vänt mot filmens 6 ljus- känsliga skikt 6a, dvs en direktkontakt föreligger mellan filmens 6 ljuskänsliga skikt 6a och det stokastiska rastrets 5 tonerskikt 5a. Detta stokastiska raster 5 är till format valt större än den ljuskänsliga filmen 6, såsom skisserat anges i figuren, och kvarhàlls således även med hjälp av sagda undertryck från exempelvis hålen 7e-7u mot underlaget 7. Det bör här noteras att såväl filmen 6 som det stokastiska rastret 5 företrädesvis är mjuka och flexibla och de anpassar sig därför till varandra och till underlaget 7. Det bör här speciellt observeras att det stokastiska rastrets 5 distinkta punkter 5a i sig kan ha identiska eller olika former men att de är diskreta, dvs de är skarpt avgränsade såväl var för sig som inbördes, och att dessa punkter är slumpmässigt fördelade över rastret. Vidare är det viktigt att, för det fall att flera stokastiska raster 5 nyttjas vid framställning av en given avbildning, stokastiska raster från olika tillverkare nyttjas eller vilka stokastiska raster har tillverkats av in- bördes oberoende, slumpvis arbetande rastergeneratorer för att undvika den potentiella risk som föreligger för att moirémönster skall alstras, om rastren genereras av samma rastergenerator eller av rastergeneratorer, vilka arbetar på samma basis, exempelvis nyttjar samma typ av slumptalsgenera- tor. 507 719 10 15 20 25 30 35 2 in the direction seen before the photosensitive film 6 and with its toner or blackening layer Sa facing the photosensitive layer 6a of the film 6, i.e. a direct contact exists between the photosensitive layer 6a of the film 6 and the toner layer 5 of the stochastic grating. 5a. This stochastic grating 5 is larger in size than the photosensitive film 6, as outlined in the figure, and is thus also retained by means of said negative pressure from, for example, the holes 7e-7u against the substrate 7. It should be noted here that both the film 6 and the the stochastic grid 5 are preferably soft and flexible and they therefore adapt to each other and to the substrate 7. It should be especially noted here that the distinct points 5a of the stochastic grid 5 may in themselves have identical or different shapes but that they are discrete, i.e. they are sharply delimited both individually and mutually, and that these points are randomly distributed across the grid. Furthermore, in case several stochastic rasters are used in the production of a given image, it is important that stochastic rasters from different manufacturers are used or which stochastic rasters have been made by mutually independent, random raster generators in order to avoid the potential risk that exists for moiré patterns to be generated if the grids are generated by the same grid generator or by grid generators which operate on the same basis, for example using the same type of random number generator.

Såsom nämnts kan flera raster 5 nyttjas med olika ljus- genomsläppligheter efter varandra för att i än högre grad styra gråskalan vid exponering av bilden 2 på filmen 6.As mentioned, several screens 5 can be used with different light transmittances one after the other to control the gray scale even more when exposing the image 2 on the film 6.

Vidare kan skilda ljusgenomsläppligheter nyttjas för bildens 2 ljusa och mörka delar. Ett första stokastiskt raster 5 med ca 60-70% ljusgenomsläpplighet nyttjas exempelvis för bildens 2 mörka delar, vilka exempelvis kan definieras såsom ljusogenomträngliga från ca 99-30%. Ett andra stokastiskt raster 5 med ca 70-90% ljusgenomsläpplighet nyttjas exempelvis för bildens 2 ljusa delar, vilka exempelvis kan definieras som ljusogenomträngliga från ca 30-1%. Givetvis kan flera stokastiska raster användas upprepade gånger liksom även exponering utan raster, exempelvis mellan två till fyra steg.Furthermore, different light transmissions can be used for the 2 light and dark parts of the image. A first stochastic grating 5 with about 60-70% light transmittance is used, for example, for the dark parts of the image 2, which can for example be defined as light impermeable from about 99-30%. A second stochastic grating 5 with about 70-90% light transmittance is used, for example, for the light parts of the image 2, which can for example be defined as light impermeable from about 30-1%. Of course, several stochastic breaks can be used repeatedly as well as exposure without breaks, for example between two to four steps.

Claims (9)

10 15 20 25 30 35 40 45 507 719 3 Patentkrav10 15 20 25 30 35 40 45 507 719 3 Patent claims 1. Sätt att med hjälp av exponering framställa en rastrerad avbildning av en bild (2) på en films (6), plåts, etc ljus- känsliga skikt (6a), k ä n n e t e c k n a t av att det innefattar nyttjande av åtminstone ett raster (5) med slumpmässigt fördelade, dis- tinkta punkter, benämnt stokastiskt raster, vilket lokali- seras före nämnda film (6), plåt, etc, på vilken nämnda rast- rerade avbildning av sagda bild avses att alstras, och att nämnda stokastiska rasters (5) toner (Sa) lokaliseras i direkt kontakt med sagda films (6), plåts, etc ljuskänsliga skikt (6a).A method of producing, by means of exposure, a screened image of an image (2) on a film (6), sheet, etc. light-sensitive layers (6a), characterized in that it comprises the use of at least one screen (5). ) with randomly distributed, distinct points, termed stochastic raster, which is located before said film (6), sheet, etc., on which said rasterized image of said image is intended to be generated, and that said stochastic raster (5 toner (Sa) is located in direct contact with said film (6), sheet metal, etc. photosensitive layers (6a). 2. Sätt enligt krav 1, k ä n n e t e c k n a t av att sagda bild (2) exponeras flera gånger på samma film (6), plåt, etc under nyttjande av flera stokastiska raster med skiljaktiga ljusgenomsläppligheter.2. A method according to claim 1, characterized in that said image (2) is exposed several times on the same film (6), sheet metal, etc. using several stochastic frames with different light transmissions. 3. Sätt enligt krav l eller 2, k ä n n e t e c k n a t av att flera stokastiska raster med skiljaktiga ljusgenomsläppligheter nyttjas primärt för ljusa respektive mörka delar av nämnda bild.3. A method according to claim 1 or 2, characterized in that several stochastic breaks with different light transmissions are used primarily for light and dark parts of said image. 4. Sätt enligt något av föregående krav, k ä n n e t e c k n a t av att stokastiska raster nyttjas, vilka har alstrats av inbördes funktionellt icke besläktade, slumpmässigt arbetande rastergeneratorer.4. A method according to any one of the preceding claims, characterized in that stochastic rasters are used, which have been generated by mutually functionally unrelated, randomly operating raster generators. 5. Sätt enligt något av föregående krav, k ä n n e t e c k n a t av att exponering av bilden göres i flera steg, varav i förekommande fall något steg genomföres utan stokastiskt raster.5. A method according to any one of the preceding claims, characterized in that exposure of the image is done in several steps, of which, where applicable, some step is performed without stochastic raster. 6. Sätt enligt något av föregående krav, k ä n n e t e c k n a t av att nämnda film (6), plåt, etc och det eller de stokastiska rastren (5) fasthålles och fixeras inbördes mot ett plant underlag (7) med hjälp av undertryck.6. A method according to any one of the preceding claims, characterized in that said film (6), sheet metal, etc. and the stochastic grid (s) (5) are held and fixed to each other against a flat surface (7) by means of negative pressure. 7. Sätt enligt något av föregående krav, k ä n n e t e c k n a t av att nämnda stokastiska raster in- begriper punkter med olika former men att varje punkt väljes att vara väl avgränsad och är därigenom distinkt.7. A method according to any one of the preceding claims, characterized in that said stochastic breaks include points of different shapes but that each point is chosen to be well delimited and is thereby distinct. 8. Sätt enligt något av föregående krav, k ä n n e t e c k n a t av att nämnda stokastiska raster (5) väljes så att dess format överstiger den avbildning som avses att alstras.8. A method according to any one of the preceding claims, characterized in that said stochastic raster (5) is selected so that its format exceeds the image intended to be generated. 9. Sätt enligt något av kraven 2-8, k ä n n e t e c k n a t av att åtminstone ett stokastiskt raster med ca 60-70% ljusgenomsläpplighet nyttjas vid expo- nering av nämnda bilds mörka delar och åtminstone ett stokas- tiskt raster med ca 70-90% ljusgenomsläpplighet nyttjas vid exponering av nämnda bilds ljusa delar.9. A method according to any one of claims 2-8, characterized in that at least one stochastic grating with about 60-70% light transmittance is used when exposing the dark parts of said image and at least one stochastic grating with about 70-90% light transmittance is used when exposing the bright parts of said image.
SE9601662A 1996-04-30 1996-04-30 Ways to produce a halftone image SE507719C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9601662A SE507719C2 (en) 1996-04-30 1996-04-30 Ways to produce a halftone image
EP97921067A EP0951662A1 (en) 1996-04-30 1997-04-29 Method of producing a screened picture
PCT/SE1997/000717 WO1997041487A1 (en) 1996-04-30 1997-04-29 Method of producing a screened picture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9601662A SE507719C2 (en) 1996-04-30 1996-04-30 Ways to produce a halftone image

Publications (3)

Publication Number Publication Date
SE9601662D0 SE9601662D0 (en) 1996-04-30
SE9601662L SE9601662L (en) 1997-10-31
SE507719C2 true SE507719C2 (en) 1998-07-06

Family

ID=20402414

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9601662A SE507719C2 (en) 1996-04-30 1996-04-30 Ways to produce a halftone image

Country Status (3)

Country Link
EP (1) EP0951662A1 (en)
SE (1) SE507719C2 (en)
WO (1) WO1997041487A1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5283154B1 (en) * 1990-10-24 1996-05-07 Nat Printing And Packaging Com Random screen waterless printing process
GB9325263D0 (en) * 1993-12-10 1994-02-16 Crosfield Electronics Ltd Method and apparatus for generating an output device control signal
FR2722584B1 (en) * 1994-07-13 1996-10-31 Nouel Jean Marie USE OF FREQUENCY MODULATED SCREENING TO LIGHTEN PRINTER SURFACES IN OFFSET

Also Published As

Publication number Publication date
WO1997041487A1 (en) 1997-11-06
SE9601662L (en) 1997-10-31
SE9601662D0 (en) 1996-04-30
EP0951662A1 (en) 1999-10-27

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