Apparently, the max size of a BMP image is 32768x32768, and with three bytes per pixel that would (uncompressed) be around three gigs. With an alpha channel, four gigs. Likely, the pixel size limit is hit here.
Apparently, the max size of a BMP image is 32768x32768, and with three bytes per pixel that would (uncompressed) be around three gigs. With an alpha channel, four gigs. Likely, the pixel size limit is hit here.