Re: sRGB & Jazz (Roger Breton)
Re: sRGB & Jazz (Roger Breton)
- Subject: Re: sRGB & Jazz (Roger Breton)
- From: email@hidden
- Date: Thu, 22 May 2003 16:37:12 -0400
On any of my systems, OS X/PS 7, the default soft proof setting in
Photoshop for an untagged file is the CMYK workspace specified in color
settings, regardless of the colorspace of the file. Go to View / Proof
Setup / Custom and select the appropriate output profile or RGB workspace,
rendering intent, etc. Then save this setting and it will appear as a
choice in the pulldown menu for future uses.
Mark Muse
Shepherdstown WV
>
Jack,
>
You don't say whether the scans are RGB to begin with but that is what I
>
assume. Now, it's very possible that the assumed 'internal' color space of
>
the scanner is 1.8 gamma based. That would account for the incredible
change
>
of brightness you describe when you say you to your image. As you know,
>
does not use 1.8 but rather 2.2.
>
As for bringing the overly saturated colors back to life, I would suspect
>
again that this is a function of your Photoshop default RGB Working Space
>
setup, most likely set to AdobeRGB? Especially if you use the US PrePress
>
Defaults color setting. In that case, when you first open the RGB scan,
>
naturally, what you're seeing is the RGB colors temporarily interpreted as
>
AdobeRGB, so your colors could very well blown out all the way to the end
of
>
the spectrum, just because of the numerical mapping going on inside
>
Photoshop from AdobeRGB to your monitor. As sRGB primaries are much less
>
saturated than AdobeRGB's (an often criticized shortcoming), when you
>
manually assign the sRGB profile to your image through the
Image>Mode>Assign
>
command, all the colors "seem" to become more "natural" looking.
>
That's my take.
>
Roger Breton
>
Laval, Canada
>
email@hidden
>
Concerning the Assign Profile command in PS7, I observed this
>
interesting effect yesterday.
>
>
A local service bureau did some sample scans of a group of mounted
>
slides for me on their Scitex Jazz Plus. The scans were 8 bit, 20MB
>
each, with very little adjustment done in the scanning interface
>
software. I asked them to just make sure the important whites were
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not blown out. Because the service bureau only had the lowest level
>
Scitex software for this scanner, no ICC workflow was used, and the
>
scans were delivered to me as untagged TIFF files (we were shopping
>
for a rate on bulk scanning).
>
>
During the course of evaluating the scans I discovered that, right
>
after opening the TIFF in Photoshop, if I use the Assign Profile
>
command to assign the loathsome sRGB profile to the file, there is a
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dramatic, marked improvement in the overall image being displayed on
>
my monitor. It's similar to the dramatic change I see when sRGB is
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assigned to untagged digicam images.
>
>
What's going on here? If I assign sRGB to these scans, which fixes
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a lot of oversaturated colors real quick, then convert to Adobe RGB ,
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then finish the editing and save, am I doing serious damage to the
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file? Or, if I just assign Adobe RGB and then edit the glowing red
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faces and other oversaturated colors, etc., which takes more time, am
>
I doing less damage than the sRGB route above. Finally, perhaps the
>
dumbest question of all, did Scitex create a scanner or scanning
>
software that scans into the sRGB space whether you want it or not?
>
>
I realize that the newer scanners for Creo are now much more
>
sympathetic to the ICC /RGB workflow.
>
>
Jack Clark
>
UC Davis
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