Jeff van Aswegen wrote: > convert img.tif -monochrome +matte -depth 8 -quality 100 img.png
This looks like you've got an 8-bit monochrome tiff. From a quick glance at: http://www.w3.org/TR/REC-png-multi.html it looks like PNG should support that, but it is mostly used for 24bit RGB and 32bit RGBA. I'm guessing that perhaps you're getting an RGB PNG, which would explain why it's larger than the Tiff. It does seem like the flags you're passing into convert should be doing this right, but I'd check to see if they are. You might see what PIL gives you, making sure you use the 'L' mode (8 bit greyscale) -Chris -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception [EMAIL PROTECTED] _______________________________________________ Image-SIG maillist - Image-SIG@python.org http://mail.python.org/mailman/listinfo/image-sig