.IMZ
format are compressed so that they consume less space. This slider allows you to change the level of compression used when saving in a format such as .IMZ
that supports compression. On this slider, the far left (0) provides no compression at all, 1 provides minimal compression and 9 (far right) provides maximum compression. The higher the compression the slower saving and loading is. You are unlikely to notice any performance difference between the options on any computer DIMG runs on but if you have to open a compressed disk image on a very very slow old computer you may want to use a lower compression level. Level 6 should be a good normal value but if you only plan to use the image files on modern computers you may as well pick level 9.