By the way, this is the TIFF 6 spec:
http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf


On 17 January 2012 23:40, Ian Tindale <[email protected]> wrote:

> Tiffs can be RGB as planar or chunky. Planar is stored as all the red;
> then all the green; then all the blue. Chunky is stored as a pixel’s RGB;
> then the next pixel’s RGB; then the next pixel’s RGB; etc. Chunky also pays
> attention to “bits per sample”, and “samples per pixel” (3 for RGB). I’ve
> never heard of a tiff chunky format that goes BGR or even RBG or anything
> that deviates from R first; then G; then B last.
>
>
> On 17 January 2012 22:49, Rogier Wolff <[email protected]>wrote:
>
>>
>> On Tue, Jan 17, 2012 at 03:11:18PM +0100, Harry van der Wolf wrote:
>> > The option to pass is --bgr (for: swap RGB order)
>> > It only happens with tiffs as far as I know.
>>
>> In case someone wants to look into this before I do:
>>
>> My "working theory" is that many tiffs come with the color planes in
>> RGB order, and multiblend ignores that and assumes that the first is
>> R, the second G, and the third B. The tiffs that go wrong happen to
>> have BGR order in the file. (*)
>>
>> George, you're welcome to compress and send me one of your 16-bit
>> tiffs so that I can investigate this theory....
>>
>>        Roger.
>>
>> (*) Or things could be exactly the other way around. Some program
>> wrote them out BGR and tagged them RGB, and Multiblend believes the
>> tags...
>>
>> --
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>>
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>
>
>
> --
> *Ian Tindale*
>



-- 
*Ian Tindale*

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