I actually found this out by accident.
I’d upload some jpeg photos to my website but unfortunately I forgot to convert the profile from ProPhoto RGB to sRGB when saving from PSD to jpeg. I initially saw no problems on my Windows 7 machine using a wide-gamut calibrated profiled display as I use Firefox which handles colour management with aplomb. It was only whilst I was looking at the uploaded photos using Safari on the iPad to check if the resolution was OK on a tablet that I got the shock of my life. Yup, Safari on the iPad does not colour manage…what a mess!
Those images with ProPhoto RGB should never have escaped into the wild in the first place as I knew how broken various systems and browsers are with regards to colour management. I just need to make sure that I am more diligent in ensuring that the profiles are converted to sRGB when saving to jpeg. I normally use Photoshop (CS4) “Save for Web & Devices…” or Adobe Bridge’s Photoshop “Image Processor…” but on this occasion I used Photoshop’s “Save as…” feature. Must be more careful next time.
My earlier findings on colour management of various browsers in Windows 7 remain though: