(11-19-2018, 01:10 AM)Ofnuts Wrote: Is it a 8-bit PNG? If you export from a >8-bit image, you get a 16-bit PNG IIRC which is not widely supported yet. You can force a 8-bit PNG format with the selector in the PNG export dialog.
I checked with Photoshop Bridge, and the files Redbuble is refusing, says they are "8 Bit".
I did 3 types of conversion to force an 8 bit image, then upload, and none worked.
Method 1: Convert image to indexed Color 8bit- via Image > Mode > Indexed.
2: Mode > Grayscale.
3: In the export dialog > 8 bpc RGB.
Now for some unknown reason every time I try to covert the image via Image > Mode > Indexed Gimp Crashes.
How are you forcing the image to be 8bit PNG in the export dialogue?