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Whether issued from a scanner or from any digital camera (P&S as DSLR) the original jpeg, tiff, raw, pictures have a color "world" profile.

Often camera settings allow to set it to say: Adobe RGB, ColorMatch, ProPhoto, sRGB, and many others, often brand proprietary profiles (i.e. Nikon RGB).
The web, as a whole is more text then picture oriented. Few file format are allowed as a "natural" display for your browser without special plug-ins.
Tiff is not recognized on web while it's a current file format in digital photography. GIF, JPEG are the favored formats.
A jpeg in sRGB should be the same viewed on your screen as viewed by anybody on a web site?
Most softwares allow for photo retouching in more elaborate profiles or gamuts (ex: ProPhoto in 16 or 32 bits) because you have a maximum of colors and shades... But when for web use, it is necessary to translate the resulting file in jpeg and sRGB !

You'll find more explanations in Bob's site ... :-)


"What can I do, What can I write, Against the fall of Night". A.E. Housman

by margouillat (hemidactylus(dot)frenatus(at)wanadoo(dot)fr) on Thu Feb 22nd, 2007 at 05:51:44 AM EST
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Bookmarked ! Thanks++
by balbuz on Thu Feb 22nd, 2007 at 05:57:00 AM EST
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Great info!  I do a lot of work in Photoshop (photo restoration and retouching), but mostly with output for prints.  I haven't really taken the time to get acquainted with posting to the web, and especially to this site, but am beginning to put together a collection for future web use. Since I convert most of my digital images from sRGB or RAW to Adobe 1998 color space), and scans to Adobe also, guess I'd best be careful to convert back to sRGB.  I know Photoshop has this capability (and I presume all the high-end tools, and and maybe Photoshop Elements, but am not sure other less expensive programs do.  With downloads from digital cameras and web posting so commonplace these days one would think it would be a necessity.

I can swear there ain't no heaven but I pray there ain't no hell. _ Blood Sweat & Tears
by Gringo (stargazing camel at aoldotcom) on Thu Feb 22nd, 2007 at 12:11:11 PM EST
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Thanks a bundle for the info and the site, margouillat!! In many ways, I'm a tech-illiterate with an appetite to learn. This is brilliant.
by Nomad (Bjinse) on Fri Feb 23rd, 2007 at 12:43:57 AM EST
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