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, 
and a basic output function to check the results
is available in the article write ppm file.




w=800 : h=600
CreateImage(1,w,h) 
;1 is internal id of image
StartDrawing(ImageOutput(1))
; fill with color red
Box(0,0,w,h,$ff)
; or using another (but slower) way in green
FillArea(0,0,-1,$ff00)
; a green Dot
Plot(10,10,$ff0000)
; check if we set it right (should be 255)
Debug Blue(Point(10,10))
 