Features/CUPS colord Support

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(How To Test: Pointer to FakeBRG.icc for testing)
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== Current status ==
 
== Current status ==
 
* Targeted release: [[Releases/17 | Fedora 17 ]]  
 
* Targeted release: [[Releases/17 | Fedora 17 ]]  
* Last updated: 2012-01-23
+
* Last updated: 2012-02-07
 
* Percentage of completion: 100%
 
* Percentage of completion: 100%
  

Revision as of 16:09, 7 February 2012

Contents

CUPS colord Support

Summary

ICC profile support for printing. Color management will be applied to printed jobs at the rasterization step.

This can lead to improved color fidelity in printed output.

Owner

  • Email: twaugh@redhat.com

Current status

  • Targeted release: Fedora 17
  • Last updated: 2012-02-07
  • Percentage of completion: 100%

Detailed Description

The idea is for CUPS to apply ICC profiles to print jobs when converting them to a raster format. It uses colord to determine the correct profile to apply, and the gstoraster filter applies the profile to the job.

Benefit to Fedora

A properly color managed system will provide better color fidelity from screen to print.

Scope

Most of the work is already in place. The main part remaining is testing.

How To Test

For "real world" testing, something like a colormunki is required. Does anyone have one of these?

A more accessible way of testing this feature is to use test profiles which are obviously wrong in some particular way (e.g. inverted), as a visual method for determining that a particular profile was in fact applied. One example is /usr/share/color/icc/FakeBRG.icc from the shared-color-profiles package, which swaps red to green, blue to red, and green to blue.

We need to test that:

  • No profile is applied when there is no profile to apply
  • The profile is applied when there is a single profile available
  • The correct profile is applied when there are several available, each for a specific resolution, color space, and media type
  • Warnings/errors in error_log are kept to a minimum

User Experience

Without an ICC profile set for a queue: no change.

With an ICC profile set for a queue: better color fidelity.

Dependencies

colord

Contingency Plan

In the worst case, the icc patch can be removed from the cups package.

Documentation

http://www.freedesktop.org/software/colord/

Release Notes

ICC profiles (for color management) are now applied to print jobs if available.

Comments and Discussion