steg challenge rgb pixelated image

I have an input image that has alot of red green blue yellow and white pixels and an output image which looks like a part of a QR code(big black blocks). I also have a second input image which looks similar to the first input image but it’s alot bigger. How do I go about reverse engineering the process used to convert the input image to the output image?

submitted by /u/TheUnreactiveHaloGen
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