OK... doesn't look like it's a 64k limit after all... Just worked my way up to 218k size (compressed, .raw) of 2048x2048 pixels without problems (using the same image in increasing sizes) and that's a far as I feel like going right now...

Can't see why my previous attempts failed though - those images were smaller in both dimensions (XxY), compressed file size (IIRC 64 to ~80k large) and about the same complexity.

I think it's time to call for Toby: visuals

/Michael