On Friday, September 20, 2019 at 9:08:14 AM UTC-7, GS wrote:

Images on buttons are usually used on toolbars where the buttons are
square and so match the image size without distortion.


Yes, my images are square and they fit on buttons, but the colors often come out wrong even when I choose 16-color bitmaps. I was just wondering if there was an ideal file format for button images?