Second mode - 24bpp. In this mode limit of colors determinated by color-count of you mobile screen (some mobiles have 65536 colors, and some another 16 million colors). Saving files in this mode - only in BMP and PNG formats. And work with GIFs - DENIED (in 24bpp mode - gif menu items are grayed and cant be selected, it is normal. if you want to work with GIFs - then restart PaintCAD and select 8bpp mode)