Design of color test pages for consumer replaceable component yield testing for ISO/IEC JTC1 SC28: Problems, Approaches & Suggestions

Transcription

1 Design of color test pages for consumer replaceable component yield testing for ISO/IEC JTC1 SC28: Problems, Approaches & Suggestions Paul L Jeran Hewlett-Packard Company Convener ISO/IEC JTC1 SC28 WG2 Office Equipment Consumer Replaceable Components Editor Monochrome Laser Yield Standard Co-Editor Color Laser and Inkjet Yield Standards

2 Test target design challenges All 5% coverages not equal CMYK vs. RGB Coverage vs. Content File Format Current US thinking

3 All 5% coverages not equal Digital vs. actual Digital coverage = pixels in the file How to deal with grayscale pixels? Actual coverage = measured coverage on the page What threshold is used after scanning? One square vs. isolated pixels Edge effects account for a significant amount of toner usage more edge length = more toner usage Based on what area? Printable area? Page size Letter vs. A4?

4 CMYK vs. RGB Device 1 CMYK Device 2 CMYK Different colorant sets Majority of offices use RGB Most offices use Microsoft Digital scanners and cameras produce RGB data Many printers do not support faithful CMYK Several printers are treated as RGB devices Can t control individual use of CMYK. GDI printers are usually RGB How to control color? CCI profiles What rendering intent? Allow device dependant color?

5 Coverage vs. Content Analytical type Design type targets used for product design Good for measurement of specific performance attributes Difficult to make device independent Confusing to the customer Customer type Based on commonly printed document types Takes into account various content (raster, vector, font) Customer can relate to yield results Difficult to determine end of life

6 File Format Raster Removes part of the printer rendering Not generally how customers print documets PRN Generally device specific PS Well controlled Not all printers have PS capability PDF Well controlled Uses the whole printing system Driver & printer Commonly used work flow in the office

7 Current thinking srgb based Use a broad range of colors within the gamut Reduces device dependence Increases difficulty of target design 5% CMYK Simplifys testing cartridges run out about the same time Realized that usage will be slightly different for each printing system 5 pages 4 customer 1 diagnostic Provides content that relates to customer usage Consumer can relate to yield numbers Diagnostic provides measurement of end of life

8 Proposed Test Pages Stephen J. Singel Labanda Sinpat Abarress Tendar, BSF URANGLE 23 January 2004 Jonathan Q. Maderia Inpert Mampem Abaress 2343 Stantin Dawer Lank Benhibe, SDF LSA Funtres Solber Netener Business Letter Mr.Maderia: Nam liber tempor cum soluta nobis eleifend ption cogue nihil consequat, velillum. Dolore eu zril feugiat nulla acilisis at vero eros accumsan et iusto odio dignis sim qui blandit praesent lutatum ril lobortis nisl ut aliquip exea commodo consequat. Duis autem vel eum ireure dolor in hendreritin vulputate velit esse molestie tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim viniam, quis nostrud exerci tation ullam corpersus cipit lotis nisl ut aliquip ex ea commodo consequat. Lorem ipsum dolor sit. Stnecrep Balrecneps Amet, consectetuer adipiscing elit, sud diam nonummy nibh veniam, recneps adipiscing elit, sed diam nonummy nibtil laoreet dolore magmana aliam erat volutpat. Ut wisi enim minim veniam, quisient nostrud. Solyom uta nobis eleifendoptn cogue nihil imerdiet domg id quod mzim plerat facer posim aum. Lorem ipsm dolor sit amet, consectuer. Duis autem vel eum iriure dolor in hendreritin vulputate velit cesse ea commodo molestie. Nam liber tempor cum soluta nobis eleifend option cogue nihil consequat, A B C D E velillum. Dolore eu zril feugiat nulla facilisis at vero eros accumsan et iusto odio dignissim qui blandit praesent. Singabet, Stephen J. Singel Demperta Aminerimum Labanda Sinpat Abarress SJS:dwg FINAL

9 Proposed Test Pages Spread Sheet

10 Proposed Test Pages News Letter

11 Proposed Test Pages Business Slide

12 Proposed Test Pages Diagnostic Page

13 Work Needed Increase the distribution of colors used Reduce device dependence Investigate how to control color ICC not generally used in the office Use calibrated RGB in PDF? If the color usage is distributed, can we use device color?