A monochromatic image is just a function f(x,y) of intensity values. For filter, these intensity values are in the range (0, 1), and are automatically converted to the bitrate needed to export and from the bitrate needed to import.
The coordinates (x, y) are in the range (0, width] and (0, height], respectively, and adhere to the image processing convention of the x axis increasing to the right and the y axis increasing downwards.
A color image is stored as multiple channels of individual monochromatic images, each with the same size.
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