Are my images Green?

Started 5 months ago | Questions thread
Stacey_K
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Re: US Web Coated. Oops
In reply to Robin Casady, 5 months ago

Robin Casady wrote:

Stacey_K wrote:

Robin Casady wrote:

Stacey_K wrote:

Robin Casady wrote:

2. Why do normal looking photos often have out of gamut colors? This seems to be common to web images with bright colors. Stacy's image below was, I assume, processed in sRGB. The color detail in the flower was not blown out. The image looked normal. Yet almost all of the flower is out of gamut. What does this mean?

It means you have the proof device/profile set to something other than sRGB, likely a monitor profile or some other default device. It can't be out of gamut for it's own color space.

OK, that was it. Thanks. It was set for US Web Coated for a print job. I'd forgot about that. I've changed it to document profile. That made the difference. I'd assumed gamut warning was set by the working color space. Oops.

And gamut warning set for the documents color space would be pointless. It simply can not be out of gamut for it's own color space! The whole point of proofing/gamut warnings are to show you where problems may be when you convert to -another- color space. By the definition of "color space", all the colors must be inside of that color space "box".

So, if one were to edit in Adobe RGB or ProPhotoRGB with the intent of sending it to a spacific printer and paper you would set the proofing/gamut warnings to that paper, correct?

Yes. For example, my printer profile is smaller than aRGB. So I would set proof device to my printer/paper profile and then use gamut warning to look for problems, assuming I am editing in aRGB. Adjust that color or whatever to make the warning go away, then send the file to the printer. I use Qimage to print with as it's simple to setup to use specific printer/paper profiles.

It's why I still feel, unless you -really- understand why sRGB won't work for a specific image, just use sRGB and you can pretty much not concern yourself with color management problems. It's what I do most of the time.

If you know your printer has a larger gamut than sRGB you would want to edit in a gamut that was larger or equal to the printer's gamout, correct?

If you think it's important to the image. Lets say there is a red flower in the background that isn't really important. It's just there. The rest of the colors you know are -easily- inside sRGB. If the flower color doesn't come out super vibrant, not a big deal so I probably wouldn't bother. Not if this same flower is the subject of the image, I would by all means edit in a larger space, carefully check the gamut against the printer and "push" the printer profile as far as I can. Make sense?

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Stacey

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