About wide vs. small gamuts, 8 vs. 16-bit &sRGB vs. Adobe'98

Started Apr 3, 2003 | Discussions thread
alFR Regular Member • Posts: 286
Re: Very nice. But what does...

I understood that from version 7, if you opened a document with a colour profile embedded Photoshop used that colourspace as the working space e.g. open a sRGB-tagged image, you edit in sRGB. I thought that the working space set within PS only determined the colourspace for new documents or those without an assigned profile. Is that correct?

As an aside, there was a big debate over at Robgalbraith.com about whether to convert documents to your working space or not, i.e. if you open a D60 image that has the sRGB (or a custom) profile assigned, should you convert it to AdobeRGB for editing or just leave it. Ian Lyons was of the opinion that you should just leave it, as the conversion to AdobeRGB wouldn't yield any real-world benefits and might degrade the image slightly. His argument seemed logical and now I've stopped converting to AdobeRGB as part of my workflow. Comments anyone?

Magne Nilsen wrote:

Any advandages of a wider gamut like AdobeRGB would be for editing
latitude of the most vivid colors. Less color clipping could occur
in long sequences or during heavy editing. The posibillities of
those quantization and rounding errors can be less with a wider
space if you solely think about the more saturated than sRGB
colors. But, it can get worse for your "inside sRGB gamut" colors
since there are fewer "buckets" to hold the sRGB part of the gamut.
If everything happened in 16-bit you would be safe, but even with
the smallest editing in 8-bit you would be worse off with AdobeRGB
than with sRGB, IMHO. For images, I think that you - as most others

  • are best adviced to use sRGB only. There are situations that

demands a larger gamut, but most of them are outside the
photgraphic world, like in creating logos, art, etc. that have a
fair chance of beeing reproduced on relevant output equipment.


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