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IDProjectCategoryView StatusLast Update
0010996ScribusPDFpublic2012-08-04 12:14
Reporterkentonr Assigned Tojghali  
Status closedResolutionduplicate 
PlatformLinuxOSUbuntuOS Version12.04
Product Version1.4.1 
Summary0010996: PDF intended for print - RGB image with image effect (grayscale or colorize) converts to cmyk incorrectly
DescriptionWhen exporting to a pdf with the intended for "printer" selected the RGB images with an effect like colorize or grayscale are darkened. There is no problem with intended for "screen".
TagsNo tags attached.


duplicate of 0004270 confirmed Color management applied before, not after, image effects 



2012-08-04 11:00

administrator   ~0028755

Last edited: 2012-08-04 12:14

Duplicate of 0004270.

Image effects are currently applied after color management. When an RGB image is exported to RGB, the effect is applied in RGB colorspace. All is ok. But when an RGB image is exported to CMYK, the image is first converted to CMYK then effect is applied in CMYK colorspace, which can lead to somewhat different result.

In any case, one can not expect RGB to CMYK conversion to systematically preserve colors : the full RGB color range cannot be achieved in CMYK. ICC profiles implement gamut mapping strategy depending on color management settings used. The gamut mapping may in particular not preserve the color luminosity. Try to modify the rendering intent used in color management preferences : "Perceptual" and "Relative colorimetric" is what usually allow to get the best result.

Issue History

Date Modified Username Field Change
2012-08-03 03:58 kentonr New Issue
2012-08-04 11:00 jghali Note Added: 0028755
2012-08-04 11:00 jghali Relationship added duplicate of 0004270
2012-08-04 11:00 jghali Status new => resolved
2012-08-04 11:00 jghali Resolution open => duplicate
2012-08-04 11:00 jghali Assigned To => jghali
2012-08-04 11:00 jghali Status resolved => closed
2012-08-04 12:14 jghali Note Edited: 0028755