New article on color management

Started Apr 26, 2013 | Discussions thread
Detail Man
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Re: Does Melissa "Gloss Over" Image Noise ?
In reply to gollywop, Apr 27, 2013

gollywop wrote:

Detail Man wrote:

They will also discover that the numerical values of RGB color readouts at low levels are erroneous.

The only apparent work-around would be to use sRGB color-space as the working color-space (if using Adobe Camera RAW, whereas Lightroom users are not afforded such color-space options).

As I understand it, Melisa is essentially ProPhoto RGB with an sRGB gamma, but it is not sRGB.

Granted. All that has been stated is that Melissa RGB uses sRGB's gamma-correction function.

It's also not clear in what sense the RGB color readouts at low levels are "erroneous."

Because they (according to Adobe's Jeff Schewe) report tone-level values within Melissa RGB's linearized low-level region that do not accurately reflect ProPhoto RGB or Adobe RGB values ...

They are what they are, and as long as they are converted meaningfully into the output space, it doesn't make too much difference how they're used as a working space.

But that is precisiely the point being made - that the "Melissa" preview display, histograms, and color values reflect sRGB (tone-level) values only - and do not reflect ProPhoto RGB or Adobe RGB.

I would assume that the ProPhoto RGB output space is legitimately ProPhoto RGB.

In terms of color-gamut, yes. In terms of preview appearance, histograms, and color values, no.

As to using sRGB as a work-around, I wouldn't want to limit myself to that in many circumstances.

Who would ? That is my point.

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