During drawing of semitransparent images you can save simultaneously image from picture and alpha-channel from clipboard as BMP (for 8bpp mode) or BMP24 (for 24bpp mode) using formats named with addition of 'pic+CB'. Image will be saved to selected file (like mypic.bmp), but clipboard - to selected file name with 'CB' addition (like mypicCB.bmp). Also you can load image to picture and alpha-channel to clipboard from these files using formats BMP (for 8bpp mode) and ??? (for 24bpp mode) named with addition of 'pic+CB' in opening menu.