Quote:
Originally Posted by sirt
Thanks for those answers. Another thing, could you clarify the difference between debanding and dithering ?
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In this context (gradfun2dbmod) they mean the same thing
In the more general sense, "debanding" can denote several different approaches to removing "banding" (and there are different type of "banding"), one method of "debanding" is dithering
http://en.wikipedia.org/wiki/Dither#Digital_photography_and_image_processing
There are different types of dithering, different algorithms. Basically they all add noise that "covers up" banding. Noise impairs compression - it requires more bitrate to encode. Ordered dithering techniques have less fluctuations, thus require less bitrate. And example in avisynth of ordered dithering is gradfun3