New article on color management

Started Apr 26, 2013 | Discussions thread
exdeejjjaaaa
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Re: Camera-->sRGB versus Camera-->ProPhoto-->sRGB
In reply to Detail Man, May 29, 2013

Detail Man wrote:

Iliah Borg wrote:

Detail Man wrote:

All raw converters ultimately have to take the demosaiced raw camera coordinates (RGB or GMCY) and map them to XYZ or Lab, though it may be only an intermediate step. This is especially true for raw converters that use ICC profiles, where either XYZ or Lab D50 is the working space. The final mapping from XYZ to any of the standard RGB spaces is just a linear transform plus an encoding curve. The lookup tables provide a mechanism for non-linear corrections (e.g., if you need to tweak deep saturated reds differently than less-saturated reds, something the earlier matrix-only profiles obviously could not do).

- Eric Chan, Reply #51 on: July 28, 2008, 08:31:26 PM

http://www.luminous-landscape.com/forum/index.php?topic=26524.msg211284#msg211284

Iliah Borg wrote:

All raw converters ultimately have to take the demosaiced raw camera coordinates (RGB or GMCY) and map them to XYZ or Lab

Thу above is incorrect.

(Perhaps) one exception being RAW Photo Processor (RPP) ?

The "have" part is totally wrong. Fantastically wrong.

Interesting.

I think IB is nitpicking to certain extent on Eric... software developer certainly can avoid using XYZ or Lab for any internal postdemosaick operations and can avoid using any CMS transforms involving PCS = XYZ or Lab if he wants to (code something different all by himself) and Eric Chan for sure knows that but he was not writing that text for IB and so was not that careful w/ wording (or was carried away by what was/is generally accepted)

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