Details
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Type:
Bug
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Status: Closed
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Priority:
Major
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Resolution: Fixed
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Affects Version/s: 4.4, 5.0.0 alpha1, 5.0.0 beta1
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Fix Version/s: 5.0
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Component/s: Core/Parsing
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Labels:None
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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.
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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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.
Show
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.
Closing