I've recently discovered the joys of using the Z-buffer to create high-resolution plots which I can then REBIN() to keep the fonts looking nice. However, my latest attempts result in floating underflow errors and an empty plot (axes but no data points) when I display the rebinned result of TVRD() in a regular IDL window. If I just plot straight to an IDL window without using the Z-buffer, I don't have any problem (but the fonts are blocky, of course). I have tried !EXCEPT = 0 and also FPUFIX() but this doesn't help with the blank plot, even tho' the former does of course rid me of the error messages. Given that I don't have problems when plotting to an IDL window directly I didn't expect FPUFIX() to actually help, but I'm getting desperate and starting to think that there's some unfortunate interaction between the plot routines and the Z-buffer. I really don't want to have to go back to plotting to a PostScript device and then generating a hi-res PNG file from that. I'm using IDL 6.1 on Windows XP Pro. Thanks, Andy.