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, GrĂ¼n 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.

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https://bugs.launchpad.net/bugs/874871

Title:
  Ristretto is not color managed

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