Most of the stock agencies require files of a certain size (e.g. 40Mb+). Does anyone know the reason they seem to equate file size to quality. Why not require a non-lossy file type and then require a minimum resolution?
I think that you are confusing two different things. The "40MB" requirement is for the uncompressed data (as shown when editing in Photoshop). That's essentially 6.7 megapixels at 16 bits per pixel per channel (48 bits per pixel R/G/B). It's not the actual JPEG filesize.
