In a set of picture I have some of them with big (sometime 80% of the
picture is covered) black (fully black) patch. These patches are also on
the exported images. I have bisected the issue to:

> commit d41531d53f9045e31c8a2c713b0f1363c47cb5de
> Author: Ulrich Pegelow <[email protected]>
> Date:   Thu Jan 3 18:06:16 2013 +0100
> 
>     dithering: automatic dithering according to output format with module 
> being auto-applied
> 

And indeed when I deselect the dither iop the black patch goes away. I
have no picture that reproduce this that I can share at the moment. I'll
keep an eye on this and will contribute a reproducer when I can. Or
maybe someone knows pretty well this module and can have a look? I'm
ready to do some testing...

-- 
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