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ID Category Severity Reproducibility Date Submitted Last Update
0008424 [Scribus] Color Management major always 09-Sep-10 08:53 09-Oct-23 22:26
Reporter victorp View Status public  
Assigned To jghali
Priority normal Resolution fixed Platform Linux
Status closed   OS Fedora
Projection none   OS Version 10
ETA none Fixed in Version 1.3.6svn Product Version 1.5.0svn
  Target Version Product Build
Summary 0008424: Pure black CMYK(0,0,0,100) is wrong in PS when Color Profiles Applied
Description In 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.
Steps To Reproduce
Additional Information
Tags No tags attached.
Attached Files ? file icon blackpoint.sla [^] (91,570 bytes) 09-Sep-10 08:53
jpg file icon CM-settings.jpg [^] (79,090 bytes) 09-Sep-10 08:53
jpg file icon image.jpg [^] (756,488 bytes) 09-Sep-10 08:53
? file icon image.tif [^] (2,457,983 bytes) 09-Sep-10 08:54
jpg file icon print-preview.jpg [^] (85,736 bytes) 09-Sep-10 08:55

- Relationships

-  Notes
(0022479)
jghali (administrator)
09-Sep-10 12:07
edited on: 09-Sep-10 12:07

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
09-Sep-10 08:53 victorp New Issue
09-Sep-10 08:53 victorp File Added: blackpoint.sla
09-Sep-10 08:53 victorp File Added: CM-settings.jpg
09-Sep-10 08:53 victorp File Added: image.jpg
09-Sep-10 08:54 victorp File Added: image.tif
09-Sep-10 08:55 victorp File Added: print-preview.jpg
09-Sep-10 12:07 jghali Note Added: 0022479
09-Sep-10 12:07 jghali Status new => resolved
09-Sep-10 12:07 jghali Fixed in Version => 1.3.6svn
09-Sep-10 12:07 jghali Resolution open => fixed
09-Sep-10 12:07 jghali Assigned To => jghali
09-Sep-10 12:07 jghali Note Edited: 0022479
09-Oct-23 22:26 christoph_s Status resolved => closed



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