Hi,
In a java project that we are doing, we have to convert images and
colors from a RGB colorspace to a CMYK colorspace.
For the colorconversion we use the following code:
float[] cieValues = colorspaceInput.toCIEXYZ(values);
float[] returnValues = colorspaceOutput.fromCIEXYZ(cieValues);
where colorspaceInput is defined by
ICC_Profile inputProfile = ICC_Profile.getInstance("srgb
color space profile.icm");
ColorSpace colorspaceInput = new ICC_ColorSpace( inputProfile);
and colorspaceOutput by
ICC_Profile outputProfile = ICC_Profile.getInstance("EuropeISOCoatedFOGRA27.icc");
ColorSpace colorspaceOutput = new ICC_ColorSpace( outputProfile);
srgb color space profile.icm and EuropeISOCoatedFOGRA27.icc are
icc colorprofiles.
We have checked the values that result from this with somebody
else who has a lot of experience with color and who uses another
program programmed in another language for color conversion. He
uses the same input and output profiles for this test.
Unfortunately there were some differences between both programs,
see the list below.
Also visually the colors were off. For example colorconverting
RGB(0.88, 0.88, 1.00) which should be light blue, resulted in a kind a
somewhat purple color when printing it on a printing press. (using just
RGB on this same press resulted in a light blue color by the way)
Am I doing the color correction correctly or do have to apply some
other settings that influence the colorcorrection?
Input RGB : 0.00, 0.00, 0.00
Java CMYK result: 0.85882354,0.8509804,0.7882353, 1.0
Check CMYK result: 0.85, 0.85, 0.78, 1.00
Input RGB : 0.88, 0.88, 1.00
Java CMYK result: 0.13577478, 0.13638514,0,0
Check CMYK result: 0.15, 0.13, 0.00, 0.00
Input RGB : 0.20, 0.00, 0.00
Java CMYK result: 0.7904326, 0.83591974,0.8076448,0.9207599
Check CMYK result: 0.51, 0.95, 0.84, 0.84
Input RGB : 0.00, 0.80, 0.00
Java CMYK result: 0.75292593, 0.00, 1.00, 0.00
Check CMYK result: 0.74, 0.00, 1.00, 0.00
Input RGB : 0.94, 0.94, 0.16
Java CMYK result: 0.13614099, 0.00, 0.92170596, 0.00
Check CMYK result: 0.18, 0.00, 0.83, 0.00
Greetings,
Roland.
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