Prepare the graphics for rendering. For all image types, it positions the image relative to the projection. For direct and indexed colormodel images, it creates the ImageIcon used for drawing to the window (internal to object). For indexed colormodel images, it also calls computePixels, to resolve the colortable and the bytes to create the image pixels.
@param proj Projection used to position the image on the window.
@return true if the image is ready to paint.
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