I've noticed more and more photographers making the mistake of not converting their images to the sRGB colourspace before posting their images here (or elsewhere on the WWW). This results in the image looking completely different when viewed in a non-colour managed environment, which is the case with most browsers. Furthermore, even if being viewed in a colour aware browser such as Firefox or Apple's Safari, the initial image in the gallery will still suffer, because the gallery software isn't colour aware and unless you view the full size image in a colour managed browser, then it's going to look flat and dull.
There's more on this in an article on the Microsoft Professional Photography portal (written by Rob Galbraith).
If you want to show your images off at their best on the WWW, my advice is to use the sRGB colourspace as a default colour space, unless you are well versed in the in's and out's of colour management and know when and when not to use a wider gamut.
The wider your chosen colour space, the worse the problem will be when it comes to viewing it in a non-colour managed environment, so if you post an image in the ProPhoto RGB space it will look worse than one posted in the Adobe RGB space.
- Thorsten.
