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Question about colorspaces and photoshop?
Old 07-15-2003, 01:40 PM   #1 (permalink)
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I recently switched my photoshop default to RGB '98 at hte reccomendation of a book I was reading about digital photo retouching and it seems the images now have a greenish tinge to them. This green tinge doesn't show up in photo shop at all but when I compare the images side by side in ACDSee all the images I've edited have this greenish hue to them (even if all I did was crop them). In some cases while not quite a green hue skin tones just don't look as natural and the image comes out looking slightly flatter.

What colorspace do you use by default and does anyone know which the Olympus E10 uses?

Is RGB 98' the wrong colorspace to use? What do you all use or do you just leave images as they come off the camera?
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Re: Question about colorspaces and photoshop?
Old 07-15-2003, 08:54 PM   #2 (permalink)
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I use Adobe RGB 1998.
Did you change your monitor color management profile? also printer? if you have a flatbed or negative scanner? to RGB 98'
Don't know about the E10.
Go to Olympus website
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Re: Question about colorspaces and photoshop?
Old 07-16-2003, 09:33 AM   #3 (permalink)
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Yes I changed my monitor profile and customized it using adobe gamma. I also set up printer profiles. I don't have a scanner. Switching between colorspaces in photoshop shows no visible difference to me it's when viewing the images with other software that they look clearly different. Any ideas?
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Re: Question about colorspaces and photoshop?
Old 07-16-2003, 10:40 AM   #4 (permalink)
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when you print...does it look like photoshop or the other p.o.s.? GO buy a book called Real World Color Management by Bruce Fraiser.



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Re: Question about colorspaces and photoshop?
Old 07-16-2003, 11:41 AM   #5 (permalink)
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According to the EXIF information the E10 uses sRGB.

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Re: Question about colorspaces and photoshop?
Old 07-16-2003, 02:31 PM   #6 (permalink)
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Is it best to stick with the camera's native?
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Re: Question about colorspaces and photoshop?
Old 07-16-2003, 03:55 PM   #7 (permalink)
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(Please correct me if I am wrong...)

AdobeRGB includes most(all?) of the colors that sRGB can reproduce plus a good deal more. If your camera can only capture in sRGB, then there is no need to convert to AdobeRGB. On the other hand, if the sRGB images you are capturing will be used in a composite with images that are in AdobeRGB, then definitely go with AdobeRGB so that you will keep as much color data (from the other source) as possible.

As far as the green tint goes, how did you get your images into the AdobeRGB colorspace? If you're going through Photoshop, I believe you should have assigned the sRGB profile to your image (because that is the colorspace your image is in) and then convert from the sRGB space to the AdobeRGB space.
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Re: Question about colorspaces and photoshop?
Old 07-17-2003, 12:58 PM   #8 (permalink)
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The files come off the camera with sRGB already imbedded. It's when I convert them that I see the change.

I'm not really using other images with these images just touching them up in photoshop. Does that negate the need to convert?
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Re: Question about colorspaces and photoshop?
Old 07-17-2003, 04:00 PM   #9 (permalink)
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(Once again, if anyone more knowlegeable sees problems or errors with my explanation, please correct me. -Thanks!)

If it were me, I'd probably just stay with sRGB though there shouldn't be an issue with converting images over to AdobeRGB. If you want to standardize on a profile, then I'd go with AdobeRGB as it is *capable* of mapping more colors...better for "future expansion".

As far as your green tinge goes...
I searched a while on google and it seems that ACDSee does not support color profiles. So what's probably happening is that ACDSee is assuming every image it opens to be (untagged) sRGB- including images that were converted and tagged as AdobeRGB. Since the colors are not remapped/converted to the right profile, you end up with wrong colors being displayed.
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Re: Question about colorspaces and photoshop?
Old 07-17-2003, 08:37 PM   #10 (permalink)
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Maybe that's it. The top is adobe rgb while the bottom is srgb. I see the difference in my web browser as well. For the srgb I chose "use embedded profile" - this was straight from teh camera only resized and cropped. For adobe rgb I just took the same image and selected convert to profile, adobe rgb (1998), engine: Adobe (ACE), Intent: relative colorimetric, and checked black point compensation and use dither. Does it look different on your end?




Even side by side in photoshop there is a slight difference, the adobe rgb looks a hair lighter/brighter but the green tinge isn't there.
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