Right you are Sean, I was refering to the pixel dimensions. Most of my pics are done @ 1024 x 768 which gives me a file (bmp) of 2305 KB. Tried one of 8000 x 6000 after reading this question, and ended up with a corrupt file of 140 MB in size. Don't think my computer has the grunt for that size. According to Manu, seems to be ok with bigger sizes =====================================================The Chaoscope mailing-list Archives : //www.freelists.org/archives/chaoscope Admin contact : chaoscope@xxxxxxxxxxxxxx Web site : http://www.chaoscope.org =====================================================