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Ive <ive### [at] lilysoft org> wrote:
> 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
It had to do with the quality settings for JPG. Was set to 90%, setting to 100%
works fine. I hadn't found where the settings were before, the Format Option
button was a bit inconspicuous I guess.
Very nice little program.
-tgq
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