New article on color management

Started Apr 26, 2013 | Discussions thread
OP gollywop Veteran Member • Posts: 8,283
Re: Does Melissa "Gloss Over" Image Noise ?

Detail Man wrote:

gollywop wrote:

Detail Man wrote:

gollywop wrote:

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.

But, isn't this only as a working space?  If so, that's not great, but it's not the same as saying that the conversion on "export" is not to a proper ProPhoto RGB output space.  Is that what you're saying?

What I am saying is that the Adobe CR and LR preview displays, histograms, and color value readouts (which are provided using "Melissa RGB") do not (within the linearized low-level region of sRGB and Melissa RGB) accurately correspond (in terms of RGB tone-levels) to what will actually exist if/when the in-process image is then rendered into ProPhoto RGB or Adobe RGB 1998 (but not sRGB).

That could very well be the case.  I'm not sure why they would be doing that.  It is clear that the monitor rendering and histograms would have to be "gamma-ed" from the underlying linearized ProPhoto RGB, but it's not clear why it shouldn't properly reflect that working space.  I can't say that the issue has ever caused me any particular problems -- but that's really beside the point.  It would be an even worse situation if the output spaces were not accurate, but I don't believe that's the case.

Meanwhile, I get the feeling that ACR, for all the time it has been with us, is still trying to get its feet on the ground.  But they do seem to be making progress.  The current version is a far cry better than what was around even one version past.

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