[argyllcms] Re: Quality of camera profile - colour banding

Milan Kní?ek wrote:
There is a LZW compressed file: ?http://www.milan-knizek.net/files/tmp/argyll_banding/banding_photo_lzw.tif 

Thanks. Without starting to look at the color conversions,
I don't like the look of the original - it seems to have a great
deal of quantization and reversals, not something you'd normally
see in a natural image. I've isolated a section of the
blue channel, and picked out a range of values and magnified
them to make it obvious, and put it here:
<http://www.argyllcms.com/bandin_B.tif>.

In the original the reversals are only one bit
(ie. there are value sequences of 59, 61, 62, 61, 63, 61, 64, 63
etc., where a more steady (but noisier) sequence would be expected,
and if a similar thing is happening in the highlights,
and it hits a sensitive part of the color conversion (ie. small
device changes lead to large PCS changes), then this may
be the source of the problem.

Graeme Gill.

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