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------- Additional comments from [email protected] Wed Jun 23 11:38:44 +0000 2010 ------- Suggestion: The conversion from CMY to CMYK as described in http://www.easyrgb.com/math.html (link from wikipedia) leads to this problem. What about converting as follows: CMYK => RGB R = maximum((1 - C + (CONST_C - 1) K), 0) * 255 G = maximum((1 - M + (CONST_M - 1) K), 0) * 255 B = maximum((1 - Y + (CONST_Y - 1) K), 0) * 255 RGB => CMYK cmy_C = 1 - (R / 255) cmy_M = 1 - (G / 255) cmy_Y = 1 - (B / 255) K = minimum(cmy_C, cmy_M, cmy_Y) C = cmy_C + (CONST_C - 1) K M = cmy_M + (CONST_M - 1) K Y = cmy_Y + (CONST_Y - 1) K where CONST_C, CONST_M and CONST_Y must be in range from 0 to 1. They might be configurable dependant on pre press demands. If most brilliant black is CMYK(0.5/0.4/0.4/1.0) we have to choose CONST_C as 0.5 or 50% and so on. CMYK values that whould result in a colour more black than the most brilliant black are changed accordingly. --------------------------------------------------------------------- Please do not reply to this automatically generated notification from Issue Tracker. Please log onto the website and enter your comments. http://qa.openoffice.org/issue_handling/project_issues.html#notification --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
