Hints - Art of the Dress

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Hint to start puzzle: Rarity likes to label her dresses by making marks on their dress stand. She calls it Horse Code. For color extraction, make sure you use an image format that does lossless compression. PNG is good, JPEG is bad. The hexcodes you should get for the first color are #BD9865 and #6C5765.
Hint for extraction: The earlier example gave Pale Gold and Black Plum. If we remove the white/gold/blue/black part of each color name, what's the same across each pair?