Itunes connect can't upload large app icon

Question

I have everything else ready submitting app for review but the large app icon (1024x1024) is not working. I have tried:

1024x1024 jpeg 1024x1024 png 1024x1024 tiff 512x512 jpg

I have done and redone these images from original, checked and rechecked and can't find anything wrong. Also the error message I get is bit wonky. When trying to submit the icon, it loads it for maybe 10 secs and then errors:

"One or more screenshots aren't in the RGB color space."

I have submitted screenshots from all different screensize versions per instructions and they uploaded with no problems.

Scanned the site and net for answers but the specific error I'm getting is not found. Lots of problems related to large app icon uploading though but those I have mostly tried already.

Help appreciated. Thanks.

Answer 1

Problem solved: tried first basic black screen 1024x1024 in png format to large icon, made with Paintbrush. Didn't work, problem with alpha. I then ran it through preview and removed alpha, then no problem. I dug up an even older version of the icon that I then ran through preview and removed alpha, that worked. Apparently the first icon I tried had some colour space associations that messed up the upload. –