2. Choose a picture something like this & then use the arrow keys to select the different profiles:
PBase Love my Viola II
Be
very, very careful using that PBase link. ONLY look at the ORIGINAL sized photo instead. PBase preserves embedded color profiles on original sized photos only. The small/medium/large thumbnails automatically generated by PBase do not have embedded color profiles, and Safari treats untagged pictures as monitorRGB, which makes things look wrong. Try it for yourself: Click on the "large" version, then the "original". Flip back and forth between the two. See the big difference? The only one that displays "correctly" is the original sized one. On my (hardware) calibrated IPS panel and MBP13" the large sized one looks way green. The original sized one looks correct.
I think Firefox 3 interprets untagged photos as sRGB which usually works as sRGB is the "web standard", however, you're still in trouble with this photo because it is tagged with AdobeRGB in its original size, meaning if you look at it in Firefox at S/M/L size, it will look way undersaturated because FF is assuming it to be sRGB when really it's AdobeRGB.
Making profile decisions based on untagged photos is completely wrong and will not lead to good results.
Don't forget that your eyes adjust to color shifts so when you change profiles the difference seems very obvious. But after time your eyes will adjust to the new profile, and you will think it looks okay. In fact your eyes are very good at this- ever notice why you can walk from fluorescent lighting indoors to the sunlight outdoors, and then to tungsten lighting elsewhere and you never really notice big shifts in color perception? But try taking pictures in all 3 conditions with your digital camera (which measures color in absolutes) without adjusting the white balance and everything looks widly yellow or blue. It's your eyes (really your brain actually) adjusting to the different lighting conditions and making the perception of color very consistent.
Since your eyes cannot measure in absolutes, you may be looking at a very messed up profile thinking it is okay- until you put it next to a properly calibrated screen, or worse, get back a printed picture that looks nothing like what you made it to be on the screen.
Here is a good demonstrator page with some info regarding color management in Safari. Safari 4 seems to behave the same as 3 did, the decision to treat untagged images as monitorRGB is deliberate on Apple's part, and is not really any more correct or incorrect than Firefox (or windows') decision to treat untagged images as sRGB.
http://www.gballard.net/psd/go_live_page_profile/embeddedJPEGprofiles.html
Ruahrc