I think this explains a lot. BMP is a format invented by and for Windows OS, and so is the software. I am convinced that it is not the JPG file itself that is larger, it is what PPT does with them that produces this bizarre consequence. I still maintain that JPGs are inherently more compressed than BMPs. Lee On 2005 Jan 27, at 12:04, Eric Dunbar wrote: >> There is a slight hitch in PowerPoint and that is that (the Windows >> version at least) sometimes compresses BMP files. JPEGs come in as >> compressed images and PowerPoint seems not to be able to handle them >> effectively -- if you manipulate them they baloon in size. The few >> times I used BMPs I managed to retain the high quality of uncompressed >> images but with "smaller" .ppt files (I wonder if it runs BMPs through >> a GIF-style compression). > > Of course, my BMP images (maps) were conducive to effective lossless > compression since there were long lines of pixels with the same > colour. The JPEG images (same resolution, 75% quality) resulted in PPT > files at least three of four times as big. _________________________________________________ For information concerning the MUGLO List just click on http://muglo.on.ca/Pages/joinus.html Our Archives can be viewed at //www.freelists.org/archives/muglo Don't forget to periodically check our web site at: http://muglo.on.ca/