I was under the impression that the Photoshop "Image size" window was a reliable guide to the suitability of the size of my uploading image; however, this appears not to be the case.
Moreover, the crucial part of the Alamy Image Manager's error message is unreadable, and won't scroll into view. Please refer to This Dropbox folder for screen shots.
As you can see, Photoshop thinks the size would be 19.6M. Alamy's automated QC check obviously thinks differently, but I'm unable to read what it thinks. I've seen talk on this forum of some kind of Alamy image size checker, but I haven't found it yet.
If someone could direct me to this Alamy image size checker and explain how to use it, I would be very grateful.