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IDProjectCategoryView StatusLast Update
0008424ScribusColor Managementpublic2009-10-23 20:26
Reportervictorp Assigned Tojghali  
PrioritynormalSeveritymajorReproducibilityalways
Status closedResolutionfixed 
PlatformLinuxOSFedoraOS Version10
Product Version1.5.0svn 
Fixed in Version1.3.6svn 
Summary0008424: Pure black CMYK(0,0,0,100) is wrong in PS when Color Profiles Applied
DescriptionIn the attached sla i have a cmyk photo, an RGB photo, a barcode and 4 lines with pure cmyk colors. When applying color profile when printing to postscript file or during print preview, pure black becomes distorted in output.

Pure black is used for the barcode and the "Pure black" text.
But checking CMYK plates individually you can see, that "Pure black" is printed on all plates, that is not good.

I assume that "Use blackpoint compensation" checkbox in Document Setup/Color management is for leaving pure black as it is in output.

See attached sla file and screenshots.
TagsNo tags attached.
Patch

Activities

2009-09-10 06:53

 

blackpoint.sla (91,570 bytes)

2009-09-10 06:53

 

CM-settings.jpg (79,090 bytes)   
CM-settings.jpg (79,090 bytes)   

2009-09-10 06:53

 

image.jpg (756,488 bytes)   
image.jpg (756,488 bytes)   

2009-09-10 06:54

 

image.tif (2,457,983 bytes)

2009-09-10 06:55

 

print-preview.jpg (85,736 bytes)   
print-preview.jpg (85,736 bytes)   

jghali

2009-09-10 10:07

administrator   ~0022479

Last edited: 2009-09-10 10:07

Fixed. In case where input and output profiles where identical, the created colorimetric transform was less that optimal.

>> I assume that "Use blackpoint compensation" checkbox in Document Setup/Color management is for leaving pure black as it is in output
No, black point compensation map input colorspace blackpoint to output colorspace blackpoint. In case of a cmyk colorspace black point is not pure black but most often a color with ink coverage between 300-400%

Issue History

Date Modified Username Field Change
2009-09-10 06:53 victorp New Issue
2009-09-10 06:53 victorp File Added: blackpoint.sla
2009-09-10 06:53 victorp File Added: CM-settings.jpg
2009-09-10 06:53 victorp File Added: image.jpg
2009-09-10 06:54 victorp File Added: image.tif
2009-09-10 06:55 victorp File Added: print-preview.jpg
2009-09-10 10:07 jghali Note Added: 0022479
2009-09-10 10:07 jghali Status new => resolved
2009-09-10 10:07 jghali Fixed in Version => 1.3.6svn
2009-09-10 10:07 jghali Resolution open => fixed
2009-09-10 10:07 jghali Assigned To => jghali
2009-09-10 10:07 jghali Note Edited: 0022479
2009-10-23 20:26 christoph_s Status resolved => closed