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#1
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Colour space in camera advice needed
ukbrown writes ...
What is the perceived wisdom for colour space in your camera Shoot RAW mode and the color space defined in-camera is ignored. You assign a space when you convert the RAW file later. If shooting jpeg then it's a personal choice, sRGB for web images, AdobeRGB for print images is common but many shoot AdobeRGB and convert the profile later for web files, and many shoot sRGB and print them, so it's a matter of choice. Will photos in Adobe 1998 format look any different once uploaded to my web pages or should they be converted to srgb. You should convert to sRGB first because the same color has a different numerical value in sRGB vs AdobeRGB and saturated colors look dull if not converted. This is because the web browsers don't use the ICM color management flow so ignore the profiles and sRGB values are closer to what the web browser will display. If you want to see an example here is a cardinal with very red colors converted from RAW into three working spaces, wide gamut ProPhotoRGB, AdobeRGB and sRGB. These were saved as jpegs without converting the ProPhoto or AdobeRGB files to sRGB first. The "red" of the feathers is represented roughly by 144/86/46 in ProPhoto, 200/77/39 in sRGB and 158/53/0 in AdobeRGB ... a color-managed program like Photoshop will read the profile tag and show roughly the same colors but a non-color managed app like your web browser will simply ignore profiles and see these as very different colors. Download these and assign the correct profiles in Photoshop and you'll see they look similar. Convert the ProPhoto or AdobeRGB images to sRGB and they will look similar on the web. Don't convert and they look terrible. http://members.aol.com/bhilton665/hilton_adobergb.jpg http://members.aol.com/bhilton665/hilton_srgb.jpg http://members.aol.com/bhilton665/hilton_prophoto.jpg Bill |
#2
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Colour space in camera advice needed
On 22 May 2006 13:18:47 -0700, Bill Hilton wrote:
You should convert to sRGB first because the same color has a different numerical value in sRGB vs AdobeRGB and saturated colors look dull if not converted. This is because the web browsers don't use the ICM color management flow so ignore the profiles and sRGB values are closer to what the web browser will display. Nitpick: I believe that recent versions of Safari on the Mac do understand color space information, at least to some extent. -dms |
#3
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Colour space in camera advice needed
Daniel Silevitch writes ...
Nitpick: I believe that recent versions of Safari on the Mac do understand color space information, at least to some extent For several years a few browsers have been "color managed" but there are two problems ... very few people use those browsers, and most jpegs for the web have the tags stripped out to save a few bytes, so the profile info isn't available in most images anyway ... Bill |
#4
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Colour space in camera advice needed
On 22 May 2006 15:10:36 -0700, Bill Hilton wrote:
Daniel Silevitch writes ... Nitpick: I believe that recent versions of Safari on the Mac do understand color space information, at least to some extent For several years a few browsers have been "color managed" but there are two problems ... very few people use those browsers, and most jpegs for the web have the tags stripped out to save a few bytes, so the profile info isn't available in most images anyway ... Well, there is that. Did the test jpgs that you posted have embedded profiles? When I looked at them in Safari 2.0, they were visibly quite different from each other, especially the ProPhoto one. -dms |
#5
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Colour space in camera advice needed
Daniel Silevitch writes ...
Did the test jpgs that you posted have embedded profiles? No. I used Photoshop's 'save for web' and the default is to strip out the ICC profiles, though there's an option to leave them in. I think AdobeRGB adds around 500 bytes, ProPhotoRGB around 1,000 bytes and sRGB almost 4,000 bytes to *each* image, so that's why they are stripped out by default. When I looked at them in Safari 2.0, they were visibly quite different from each other, especially the ProPhoto one. If they did have profiles and you were using a color managed browser then they would look very similar, which you can show by downloading, opening in Photoshop and assigning the right profile (if you have the missing/mismatch warning set it will prompt you automatically). Bill |
#6
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Colour space in camera advice needed
On 22 May 2006 16:19:06 -0700, Bill Hilton wrote:
Daniel Silevitch writes ... Did the test jpgs that you posted have embedded profiles? No. I used Photoshop's 'save for web' and the default is to strip out the ICC profiles, though there's an option to leave them in. I think AdobeRGB adds around 500 bytes, ProPhotoRGB around 1,000 bytes and sRGB almost 4,000 bytes to *each* image, so that's why they are stripped out by default. That's what I thought, because I've seen examples of jpgs with embedded profiles, and Safari gave similar-looking images for the different spaces, whereas Firefox gave very different looks. I'm mildly startled that Firefox doesn't support color management; I wonder whether it's on the to-do list. When I looked at them in Safari 2.0, they were visibly quite different from each other, especially the ProPhoto one. If they did have profiles and you were using a color managed browser then they would look very similar, which you can show by downloading, opening in Photoshop and assigning the right profile (if you have the missing/mismatch warning set it will prompt you automatically). I don't have Photoshop, but I'll take your word for it. -dms |
#7
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Colour space in camera advice needed
On 22 May 2006 15:10:36 -0700, "Bill Hilton"
wrote: Daniel Silevitch writes ... Nitpick: I believe that recent versions of Safari on the Mac do understand color space information, at least to some extent For several years a few browsers have been "color managed" but there are two problems ... very few people use those browsers, and most jpegs for the web have the tags stripped out to save a few bytes, so the profile info isn't available in most images anyway ... Bill If I read the notes correctly, Firefox (PC and Mac) are both ICC-aware as is Internet Explorer on the Mac. rafe b www.terrapinphoto.com |
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