ICEpdf
  1. ICEpdf
  2. PDF-555

CMYK black configuration

          Details

          • Type: Bug Bug
          • Status: Closed
          • Priority: Major Major
          • Resolution: Fixed
          • Affects Version/s: 4.4, 5.0.0 alpha1, 5.0.0 beta1
          • Fix Version/s: 5.0
          • Component/s: Core/Parsing
          • Labels:
            None
          • Environment:
            any

            Description

            The cmyk colour conversion to rgb algorithm has always produced image that were a little dark when compared to acrobat. During the image refactoring work there was a consolidation as to which cmyk algorirthms where being used add a a result the black levels are a lot closer then in 4.x.

            I'm going to revert our fudge value but also include a system property org.icepdf.core.cmyk.black=255. Values greater than 255 will lighten an image and values less than 255 will darken the image.

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              Patrick Corless added a comment -

              We actually have to place for black configuration. The first is in imaging and uses 255 int values and the other is for colorants for fill and stroke where we use 0-1 float values so we need two properties:

              org.icepdf.core.cmyk.colorant.black=1.0

              • value is multiplied by the black float values so 0.5 would make the blacks half as black.

              org.icepdf.core.cmyk.image.black=255

              • same as defined above.
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              Patrick Corless added a comment - We actually have to place for black configuration. The first is in imaging and uses 255 int values and the other is for colorants for fill and stroke where we use 0-1 float values so we need two properties: org.icepdf.core.cmyk.colorant.black=1.0 value is multiplied by the black float values so 0.5 would make the blacks half as black. org.icepdf.core.cmyk.image.black=255 same as defined above.
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              Patrick Corless added a comment -

              Closing

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              Patrick Corless added a comment - Closing

                People

                • Assignee:
                  Patrick Corless
                  Reporter:
                  Patrick Corless
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                  Dates

                  • Created:
                    Updated:
                    Resolved: