To create the MacOS icon, do * In GIMP, export the icon to tiff (png might be as good or better), fullsize (currently 128x128 [Aug 08]) * You should also export a 16x16 icon to the same format, tweaked for readability at that small size * Go to a mac machine * run 'Icon Composer' and create the icon from the exported tiff * drag fullsize tiff from finder to the appropriate panel in Icon Composer (currently the 128x128 panel) * it should ask about copying the image to different sizes, opt for 'Copy to all smaller sizes' * drag the 16x16 image to the 16x16 panel * exit Icon Composer * you will be asked where to save, save to shared/greenstone(2|3)/icon/icon.icns To create the Windows icon, do * In GIMP, export icons of these sizes: 128x128, 64x64, 48x48, 32x32, 16x16 * 16x16 icon should have the edges cropped for readability at this small size * Open each as a layer in a new GIMP image (File->Open as Layer), and delete other layers (like 'Background') * Save as an ico file