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A study of FujiFilm’s FM screening method TAFFETA
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
2006 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Studie av FujiFilms FM raster TAFFETA (Swedish)
Abstract [en]

The study of Fujifilm´s halftoning method Taffeta has been done on behalf of Fujifilm Sverige AB, they especially wanted a subjective evaluation of Taffeta. Taffeta is a FM halftoning method of second generation, specific for this halftoning method is the structure of the dots, which should give a print with more evenness. Being present at the installation of Taffeta at Norrköpings Tryckeri gave a better understanding for the printing process and Taffeta. During the installation, the settings were done so the print with Taffeta is as similar it can be with print with AM halftoning method, in this way the printing company can use them both combined in print.

Due to Fujifilm’s wishes, a subjective evaluation of Taffeta was set with highest priority. An objective evaluation was also performed, in this way there could be drawn parallels between this and the subjective evaluation. There are several parameters that can be studied in these two evaluations; we chose some of them that we found had importance in both visual opinion and when measuring the objective capacity of Taffeta. When decision was made of which parameters we should study a sheet, which should be used during the installation at Norrköpings Tryckeri, was produced. This sheet contained images to the subjective evaluation and areas that could be used in the objective evaluation.

In the subjective evaluation a test panel was arranged, in this test panel it was eighteen persons present, these were divided into four groups dependent on experience from printing business. Parameters that were studied were; a general impression of the image, evenness, naturalness and sharpness in images. Persons in the test panel graded our five chosen images, printed with both AM halftoning method and Taffeta, in these five parameters. There was also a test where the persons compared the images, printed in AM and Taffeta, in this way we got a result which halftoning method that was found as better for each image. In the subjective evaluation we studied dot gain, gamut for prints and the amount of paint used in the halftoning methods.

These evaluations has shown that print with AM halftoning method and Taffeta is found visual almost as same, but sharpness is much better reproduced with Taffeta according the test panel. Results from the subjective evaluation shows that the professional category does not distinguish much. Persons working with advertising and people that work in the printing industry found print with AM as better, while teacher at the university and students found print with Taffeta as better. In the objective evaluation the dot gain and the gamut for the prints with the two different halftoning methods did not distinguish, because the settings that was done at the installation. The amount print that is used in print is much less with Taffeta, 15% less than print with AM halftoning method. Strands Tryckeri, which has used Taffeta a longer time has established this.

Abstract [sv]

Denna studie har utförts på uppdrag av Fujifilm Sverige AB, de önskade en utvärdering av deras rastreringsprodukt Taffeta. Taffeta är ett andra generationens FM raster, specifikt för detta raster är att punktuppbyggnaden är anpassad till god tryckbarhet som ska ge en trycksaksprodukt ett jämnare intryck. Närvarande vid installation av Taffeta på Norrköpings Tryckeri innebar en bättre förståelse för tryckprocessen och Taffeta. Vid installationen önskades tryck med Taffeta ge ett så likt resultat som möjligt som tryck med AM raster, på detta vis kan tryckeriet kombinera AM raster och Taffeta.

En subjektiv utvärdering av Taffeta var av högst prioritet, då Fujifilm speciellt önskade just det. Genom att även göra en objektiv utvärdering kunde paralleller med den subjektiva utvärderingen dras. Eftersom det finns många parametrar att studera i de två utvärderingarna valde vi ut ett fåtal som vi ansåg hade stor betydelse vid visuell upplevelse samt vid objektiva mätningar. Då beslut tagits om vilka parametrar som skulle studeras producerades ett testark som skulle användas vid installation av Taffeta på Norrköpings Tryckeri, detta testark innehöll bilder för den subjektiva utvärderingen samt mätytor för den objektiva utvärderingen. Vid den subjektiva utvärderingen arrangerades en testpanel på arton personer, dessa indelade i fyra grupper beroende på erfarenheter från tryckeri branschen. De parametrar som studerades var helhet av bildens intryck, jämnheten i bilden, naturligheten som bilden återger samt skärpan i bilden. Betygsättning av de fem utvalda bilderna, tryckta i AM raster och Taffeta, skedde, samt ett jämförelsetest av samma motiv tryckta med vardera rastreringsmetod.

I den objektiva utvärderingen framtogs punktförstoringskurvor, färgomfång och färgåtgång för de båda rastreringsmetoderna. Utvärderingen har visat att tryck med AM raster och Taffeta uppfattas visuellt som nästintill lika, skärpan återges dock bättre med Taffeta enligt vår testpanel. Resultaten från det subjektiva testet visar att yrkeskategoriernas uppfattning av tryck med Taffeta inte skiljer sig mycket, en viss antydan finns att originalare och tryckare uppfattar tryck med AM raster bättre, medan lärare och studenter uppfattar tryck med Taffeta som bättre.

I den objektiva utvärderingen framgick att punktförstoringskurvorna och färgomfånget inte skiljer sig markant mellan AM raster och Taffeta, detta till grund för installationens syfte att tryckeriet ska kunna kombinera rastreringsmetoderna. Färgåtgången skiljer sig markant mellan rastreringsprodukterna, vid framtagning av färgåtgång var resultatet att tryck med Taffeta innebär 15% mindre färgåtgång än AM raster, detta är något som Strands Tryckeri, som kört med Taffeta en längre tid, även har konstaterat.

Place, publisher, year, edition, pages
2006. , 89 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-97194ISRN: LITH-ITN-MT-EX--06/054--SEOAI: oai:DiVA.org:liu-97194DiVA: diva2:647460
Subject / course
Media Technology
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Examiners
Available from: 2013-09-11 Created: 2013-09-04 Last updated: 2013-09-11Bibliographically approved

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