Am 21.03.2011 17:55, schrieb Trevor G Quayle:
I assume then that the dithering doesn't apply to jpg
saving?

Dithering works also with jpeg output but as jpeg is always lossy
and most of all the RGB -> YCbCr (the color space internal used by jpeg) 
  transformation is already lossy it might happen the the dithered color 
falls exactly into a gap produced by rounding errors of the lossy color 
space transformation, err, if you know what I mean, I'm not very good in 
explaining such things.
First try it with the option chroma-subsampling (within the 'Save JPEG 
Options' dialog) DISABLED and a quite high quality setting (lets say 
95%) if this doesn't help you can try to change the exposure value (just 
some barely visible amount increased or decreased) within the 
Tonemapping dialog so the dithered colors might miss the 'gaps'.

-Ive

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