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![Programming Puzzles & Code Golf](//cdn.sstatic.net/Sites/codegolf/img/apple-touch-icon.png)
Your task is to take a 24 BPP sRGB image and output the same image upscaled 3x into red, green, and blue subpixels. The resulting image will be made entirely of pure black, red, green, and blue pixels.
Each pixel from the source image, when zoomed, produces an arrangement of 9 sub-pixels that ca...