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Show a basic storage type to handle a simple RGB raster graphics image,
and some primitive associated functions.

If possible provide a function to allocate an uninitialised image,
given its width and height, and provide 3 additional functions:
* one to fill an image with a plain RGB color,
* one to set a given pixel with a color,
* one to get the color of a pixel.

(If there are specificities about the storage or the allocation, explain those.)

''These functions are used as a base for the articles in the category [[Raster_graphics_operations|raster graphics operations]],
and a basic output function to check the results
is available in the article [[write ppm file]].''