As a developer, it is near impossible to get the pixel RGB colour from an image, without using external methods.
If this feature were to be added, I would be able to use the upcoming StudioService:PromptImportLocalAsset() alongside it for my heightmap importer plugin. I would get the colour value of each pixel within the image and use that, removing the need for an external program to convert the heightmap and texture map images into something Studio can read.
It would be nice to have something as seen in this post:
If the feature was something similar to the quote above, I could run a simple for loop to get each pixel colour within the image. I would also be able to get the image size (Provided the function returns nil if the pixel did not exit), although another feature request for that would probably be better.