I know Istock converts Adobe rgb to srgb for thumbnails, but how many of the other sites are doing that now?

All, If there smart.

and thats why I do it myself before uploading

So I should (shoot and) work in adobe RGB color space, and then convert after post-processing, just before saving to jpeg?  Another question.. which settings are best to use when converting to sRGB ( i.e. perceptual, relative colorimetric,  black point compensation, etc)?

This color space issue has had me a bit confused for the past several weeks (especially after noticing how drab some of my food photography thumbnails looked upon being accepted at some sites) and I'd love to get a definitive answer!

Thanks!

So I should (shoot and) work in adobe RGB color space, and then convert after post-processing, just before saving to jpeg?  Another question.. which settings are best to use when converting to sRGB ( i.e. perceptual, relative colorimetric,  black point compensation, etc)?

This color space issue has had me a bit confused for the past several weeks (especially after noticing how drab some of my food photography thumbnails looked upon being accepted at some sites) and I'd love to get a definitive answer!

Thanks!

just shoot SRGB. relative colormetric and blk point compensation.Unless your doing a lot of printing, then I would use Prophoto profile.For general use Just use Srgb and forget it. Your monitor is Srgb.

I always shoot raw and convert my files to adobe rgb tiff then  to adobe rgb jpg as we know SRGB  looks better on computer screen  but for printing purposes RGB is preferred.and you know converting  your colour profile from RGB  to SRGB is an easy task but if you convert  an SRGB file to   RGB you wouldn't get the same quality of an original RGB file thus I stick with my work flow and as mentioned above all sites should convert thumbs to SRGB for better looking colours.
may be all the sites  should  explain that  in their photo requirement sections  to end the confusion that  many contributers have.   

Here's Stockxpert. It's clear that Istock have change something...

Another example whit an other picture... This one was rejected for overfiltred first and finally accepted via scout (Istock)




This time whit Shutterstock and again Istock is the most away from the natural colors. Maybe this explain some overfiltred rejection?