Am 06.01.2011 13:06, schrieb zalakainz:

> What I can not understand is why this option is the default in the render
> window. Cause confusion.

To switch preview output dithering on or off depending on chosen file 
format, bit depth and output file dithering settings would have required 
a good deal of extra effort, so output dithering is always on (it's not 
the default - it's simply the one and only setting there is). The only 
question was whether to turn dithering on or off by default; the 
decision was to leave it off for backward compatibility, in order not to 
surprise the user with increased file sizes, or problems when trying to 
print POV-Ray generated images.

But I do understand your confustion - the situation is not ideal as it is.

Then again, the render preview behaviour is perfectly consistent insofar 
as it matches the behaviour when you choose low-quality output settings, 
such as 5-bit PNG or low-quality JPEG: In that case the preview doesn't 
show you the loss of quality either.

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