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Regardless of the mode, images can have an optional alpha channel for transparency. GIMP sees this as an indexed image with only 2 colours. Monochrome: Two colours, often black and white.On the other hand, reduced or no dithering will result in smaller files when saved as GIF or PNG (or BMP with the Run-Length Encoded option set). For the best quality results (especially with pictures that have gradual tonal variance) use Floyd-Steinberg dithering: it will give a grainy texture to the picture, but reduce visible banding between different colours. When you convert an image into this mode, or when you are reducing the color depth of an image, dithering options give you control over how colours are scattered. Indexed: In this mode, the image consist of pixels picked from a palette of up to 256 colours.Supported formats: XCF, PNG, TGA, TIFF, SGI. GIMP supports grayscale well and is usable for most tools that don't specifically require colour information. Grayscale: The grayscale mode uses one channel to display a gray image.Supported formats: XCF, PNG, TGA, TIFF, SGI, BMP. It is made up from 3 channels of 256 tonal variants, making a total of 16.7 million colours - 256 * 256 * 256. True Colour (RGB): This has the best support in GIMP.