I'm really not trying to offend you, and I'm sorry if some other thread mood spills over here.
1. the histogram is based on this setting, with adobe rgb you get a better representationWhat histogram? Oh, you mean the one that the camera shows you AFTER you've taken the picture.
What histogram are you using?
2. in every cr2 there's a full jpeg thumbnail with the color space selected.Of which the purpose is, beside for generating the utterly useless histogram?
It's extremely useful for quick sorting and browsing as a lot of software browsers use it - rendering the raw data takes a lot of time.
And in any case you should calibrate the monitor and use color management even with an srgb model.So when will you pop over to calibrate my screen, before or after you calibrate every other computer and iPad screen on earth?
If you don't invest in a cheap monitor calibration tool, that's your bad, I waited too long until I finally discovered how essential this is.
A lot of browsers have built-in color management nowadays: IE, Firefox, Safari.So what do these browsers do with an AdobeRGB photograph that is to be displayed on grandma's uncalibrated sRGB'ish monitor?
Obviously they display the photograph as srgb'sih if you set stock srgb in your browser and os color management. Are you sure you know how color management works :-o ?
Many better photo labs have printers that go beyond srgbWe don't have any of those around here ... just those KODAK self-service kiosks.
Ugh, time to move :-p ... where I live (Germany) most internet printing sites are wider gammut than srgb and also a lot of local print shops.
Ugh? How so?Obviously, because the gamuts aren't the same.
To repeat your full statement: "AdobeRGB to sRGB conversion is never 100% successful because the gamuts aren't the same". When you read it, does that make sense to you?
In my experience colour management only works when you can control all the devices in the chain.
When you edit a shot and then print it, this includes two devices - your monitor (use a color calibration tool) and a printer (use a color calibration tool or the print shop's cms profile). Doesn't sound like rocket science, esp. with soft proofing in software like Lightroom.
In these case sRGB is the common language.
Under closer scrutiny, srgb is rather different between devices that claim to be srgb. Probably better than displaying adobergb or photopro, but still calibration and color management is essential unless you don't care about the accuracy.