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https://issues.apache.org/jira/browse/PDFBOX-166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Hewson closed PDFBOX-166.
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> ConvertColorSpace RGB to CMYK
> -----------------------------
>
> Key: PDFBOX-166
> URL: https://issues.apache.org/jira/browse/PDFBOX-166
> Project: PDFBox
> Issue Type: Bug
> Priority: Minor
> Fix For: 2.0.0
>
>
> [imported from SourceForge]
> http://sourceforge.net/tracker/index.php?group_id=78314&atid=552832&aid=1486459
> Originally submitted by ddelangle on 2006-05-11 05:15.
> Hello,
> I've corrected what seemed to me to be a bug on
> convertion on grey scales. I did this on CVS version
> from 19/04/2006
> I had to inverse the K value of CMYK (1 - value). Here
> is the corrected method :
> private void replaceGrayTokensWithCMYKTokens( List
> editedPageTokens, List pageTokens, int counter,
> Hashtable colorEquivalents )
> {
> // Get current RGB color.
> float gray = ((COSNumber)pageTokens.get(
> counter - 1 )).floatValue();
>
> ColorSpaceInstance grayColor = new
> ColorSpaceInstance();
> grayColor.colorspace = "Grayscale";
> grayColor.colorspaceValues = new int[] { 100 -
> Math.round( gray * 100 ) };
> ColorSpaceInstance cmykColor =
> (ColorSpaceInstance)colorEquivalents.get(grayColor);
> float[] cmyk = null;
> if( cmykColor != null )
> {
> cmyk = new float[] {
> cmykColor.colorspaceValues[0] / 100.0f,
> cmykColor.colorspaceValues[1] / 100.0f,
> cmykColor.colorspaceValues[2] / 100.0f,
> cmykColor.colorspaceValues[3] / 100.0f
> };
> }
> else
> {
> cmyk = new float[] {0,0,0,1 - gray};
> }
> //remove the Gray components that are already
> part of the editedPageTokens list
> editedPageTokens.remove(
> editedPageTokens.size() -1 );
> // Add the new CMYK color
> editedPageTokens.add( new COSFloat( cmyk[0] ) );
> editedPageTokens.add( new COSFloat( cmyk[1] ) );
> editedPageTokens.add( new COSFloat( cmyk[2] ) );
> editedPageTokens.add( new COSFloat( cmyk[3] ) );
> }
> I hope this is correct.
> Regards,
> Denis
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