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Having issue with files in CS4 any suggestions?

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  #31  
Old 05-24-2010, 09:30 AM
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Re: Having issue with files in CS4 any suggestions

The numbers will not be the same since the source color space was different. The color appearance should look the same. Test it out.

At such a time that Version 4 ICC profiles for working spaces become the norm, we’ll have a bit more control over this gamut mapping. Today its going to be Relative Colorimetric even though Photoshop lets you pick Perceptual. There is no such table in the working space profiles PS installs. That’s what V4 brings to the table. But again, converting two such spaces to sRGB should maintain the color appearance, the two should look the same. On a wide gamut display, colors outside sRGB will appear less saturated of course.
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  #32  
Old 05-24-2010, 01:11 PM
Flashtones Flashtones is online now
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Re: Having issue with files in CS4 any suggestions

Quote:
Originally Posted by andrewrodney View Post
On a wide gamut display, colors outside sRGB will appear less saturated of course.

Sorry, I don't get what you mean here. Less saturated than what?
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  #33  
Old 05-24-2010, 01:15 PM
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Re: Having issue with files in CS4 any suggestions

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Originally Posted by Flashtones View Post
Sorry, I don't get what you mean here. Less saturated than what?
You’ve got a document that is say in ProPhoto RGB, it has some colors that exceed Adobe RGB (1998). You convert it to Adobe RGB then a copy to sRGB. You look at the sRGB and Adobe RGB document on a standard, sRGB like display. They will both look the same. The Adobe RGB doc (and for that matter, the ProPhoto RGB doc) have colors outside sRGB. You can’t see em.

Now you take the sRGB doc and the Adobe RGB doc and view them on an extended gamut display like my NEC 3090. The sRGB doc will not show saturated colors as vividly as the Adobe RGB doc on this display. Just as if you had a ProPhoto image with vivid colors and you printed it on a device that funnels everything through sRGB and then printed it on an Epson with HDR inks. That Epson print would show more vivid, saturated colors because you had those colors in the document and your output device can print them. The sRGB printer can’t.
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  #34  
Old 05-24-2010, 01:48 PM
Flashtones Flashtones is online now
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Re: Having issue with files in CS4 any suggestions

Sorry, I still don't get where colors outside of sRGB are looking less saturated on a wide gamut display. Less saturated than they'd look where?

Are you simply stating that after a document is converted to sRGB is will be of lower gamut, even when viewed on a wide gamut monitor? That I get, but if you're saying something beyond that I still don't get it.
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  #35  
Old 05-24-2010, 02:21 PM
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Re: Having issue with files in CS4 any suggestions

Colors outside of sRGB are not visible on an sRGB like display. They are out of gamut. They are more saturated. If you viewed the sRGB doc and the Adobe RGB doc on a wider gamut (Adobe RGB like display), you would see the more saturated colors in the Adobe RGB doc.

Quote:
Are you simply stating that after a document is converted to sRGB is will be of lower gamut, even when viewed on a wide gamut monitor?
Its gamut is what it is. Colors that exceed sRGB gamut are not visible on an sRGB display. And well yes, in the example above, the Adobe RGB doc converted to sRGB will be of lower gamut than the original.
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  #36  
Old 05-24-2010, 03:06 PM
Flashtones Flashtones is online now
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Re: Having issue with files in CS4 any suggestions

Quote:
Originally Posted by andrewrodney View Post
Colors outside of sRGB are not visible on an sRGB like display. They are out of gamut. They are more saturated. If you viewed the sRGB doc and the Adobe RGB doc on a wider gamut (Adobe RGB like display), you would see the more saturated colors in the Adobe RGB doc.



Its gamut is what it is. Colors that exceed sRGB gamut are not visible on an sRGB display. And well yes, in the example above, the Adobe RGB doc converted to sRGB will be of lower gamut than the original.
Andrew, I'm sorry, I guess I'm dense. All your answers make sense in and of themselves but don't seem to be answering the question.

"On a wide gamut display, colors outside sRGB will appear less saturated of course."

What is the context of this statement? What is being compared to what?

Say we have an aRGB file, with colors outside of sRGB, and we are viewing it on a wide gamut monitor. Back to your statement, those colors in that document which are outside of sRGB appear less saturated "than what" on the wide gamut monitor?
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  #37  
Old 05-24-2010, 03:15 PM
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Re: Having issue with files in CS4 any suggestions

Quote:
"On a wide gamut display, colors outside sRGB will appear less saturated of course."
More saturated, sorry. You’ve got say a Photoshop generated spectral gradient. You know, all the colors of the rainbow. You build it in Adobe RGB (1998). You duplicate it and convert to sRGB. The more saturated colors in the Adobe RGB (1998) doc clip to the smaller gamut of sRGB. You have two docs in two different gamut working spaces.

In an sRGB display, both look the same. Because all those more saturated colors that do exist in the Adobe RGB (1998) doc are outside the gamut of the sRGB display.

OK, now you take both and view them on the wider gamut display. It can show you those more saturated colors in the Adobe RGB doc. That’s why people buy extended gamut displays. You should more easily see more saturated colors in the Adobe RGB doc on the Adobe RGB display but they were not visible on the sRGB display because they were out of gamut for that output device.

Quote:
Say we have an aRGB file, with colors outside of sRGB, and we are viewing it on a wide gamut monitor. Back to your statement, those colors in that document which are outside of sRGB appear less saturated "than what" on the wide gamut monitor?
They appear more saturated on the wide gamut display. They should appear the same on an sRGB display (the wider gamut colors can’t be shown to you). Consequently the sRGB doc on the wide gamut display would look less saturated in those very saturated colors than the Adobe RGB (1998) doc. The Adobe RGB doc has colors that are more saturated and you can now see them on the extended gamut display.
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  #38  
Old 05-25-2010, 10:38 AM
Flashtones Flashtones is online now
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Re: Having issue with files in CS4 any suggestions

Thanks Andrew, MORE saturated makes all the sense in the world.

Thanks for all the help.
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