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Originally Posted by henkvdg
Lena16fs on my iLiad looks more like a 3bit/pixel picture then a 4 bit/pixel picture.
I used microsoft Photoeditor to reduce the numer of tones to 8 and then it looks almost the same as on my iLiad. (with the image-viewer).
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The algorithm doesn't guarantee that all the available grey levels get used in a particular image.
It works in a manner similar to MP3 does for music, it pushes the visual error caused by the loss of grey levels into areas that the human eye doesn't pay as much attention to. Sort of like pushing dirt under the carpet to hide it.
Also, I deliberately used iRex's own chosen error distribution algorithm. I'm not saying it's the best (it isn't) but I figure it'll be quicker to get 2.8.1 of PDFViewer out of them by using it.