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Subject: Re: raw 3.1 professional custom profiles for highend digital cameras



ps. Regarding the 15bit+1 issue. If they are talking about signed integers they mean 32bit integers. The 15bit+1 is unsigned and meant for really fast multiplies (read blending). And goes like so: an image pixel ranges from [0 ... 32768]. Multiply image pixels (as in a blending mode) and you get a maximum value of 32768x32768. This still fits in a 32bit signed integer. A really fast bit-shift operation can be used instead of a very slow division to bring this value back to the image pixel range.

I do not think this statement is correct. According to Roger Clark, Photoshop uses 16 bit signed integers.

The following is from Microsoft Visual C++ which supports integer types ranging from 8 to 32 bit signed and unsigned:



I don't know what language PS is written in, but probably C++.

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