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Revision as of 10:24, 3 February 2012
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
- Name: Tim Waugh
- Email: twaugh@redhat.com
Current status
- Targeted release: Fedora 17
- Last updated: 2012-01-23
- 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.
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.