Ristretto is not color managed

[Andreas Siegert]

Ristretto is not color manged leading to a messed up display of standard images on wide gamut screens and loads of other display messups.
I seriously question the wisdom of bundling this sillyness with XFCE when there are already other viewers on Ubuntu that can display images correctly (geeqie).

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: ristretto 0.0.93-2ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Sat Oct 15 10:17:01 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
SourcePackage: ristretto
UpgradeStatus: Upgraded to oneiric on 2011-10-14 (0 days ago)

[Charlie Kravetz (cjkgeek)]

Since this application is a part of Xfce, it is supplied as a part of Xfce. As for "silliness", that does not seem to apply to bug report. Please respect the developers of all applications. I don't believe this report will lead to any developer wanting to take action with comments such as this.

[Lionel Le Folgoc (mrpouit)]

Also, it'd be great if you could really describe your problem ("Ristretto is not color manged" doesn't make any sense to me -- ristretto can display pictures with colors…).

[Andreas Siegert (afx)]

Yeah, ristretto displays color images. But with the wrong colors depending on the screen.
See http://en.wikipedia.org/wiki/Color_management

And try to display this in Ristretto: http://img.fotocommunity.com/photos/4763821.jpg
(Gelb should be yellow, Grün should be green, Blau should be blue, Purpur should be purple and Rot should be red)
Ristretto is incapable of displaying this image correctly as It does not know about color management (this is an extreme test image to show whether a program understands CM or not)

Displaying images without color management leads to unpredictable colors because no two screens display the same binary values in an image file identical.
As long as sRGB screens where the common ground that was ugly but not much of a problem for the masses. Now that wide gamut screens that display a gamut of Adobe RGB or wider become more and more common this problem will affect more and more people as the common assumption of everything is sRGB just does not work anymore.

As ristretto is the default image viewer that everyone who installs XFCE will get it should either handle images properly or be exchanged for a program that does it.

[Lionel Le Folgoc (mrpouit)]

Ok, I understand now (here, "Gelb" appears pink :). Thanks.

However, I'm not sure it's really a critical feature for ristretto (it's only a fast and simple image viewer… I guess if you care about color profiles you'll use something else -- gthumb and eog also display wrong colors here btw).
You may want to file a bug report for this feature on <https://bugzilla.xfce.org/> (you'll probably have more arguments to convince the upstream developer than me doing a copy-paste from your comments).

[Andreas Siegert (afx)]

Yeah, gthumb and eog are also broken, but they are not the default for XFCE....
They need fixing as well, can't remember how often I had to tell people to use geeqie instead of them if they want to see the same colors in the image viewer as in their raw developer....

The problem is the average guy out there who got his shiny new wide gamut Dell or whatever new screen and wonders why images suddenly look totally messed up when using the default image viewer compared to what he sees in his imaging program.

Hmm, why does the commandline Ubuntu burg report not open up a bug at the XFCE bugzilla when an XFCE component is reported?
I'll head over there.

[Lionel Le Folgoc (mrpouit)]

Thanks.

> Hmm, why does the commandline Ubuntu burg report not open up a bug at the
> XFCE bugzilla when an XFCE component is reported?

This is a necessary step to separate ubuntu-only (e.g. packaging issues that shouldn't be sent upstream) from real upstream bugs. Also, most users don't want to create another account on another bugtracker.

[James (jamestheawesomedude)]

Ristretto spectacularly fails when presented with the images from this page: http://www.libpng.org/pub/png/png-colortest.html