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I'm having a bit of trouble understanding the mathematics behind hexadecimal numbers.
I understand the FF in the red, green, or blue values would be the lightest possible red, green, or blue, and the same for 00 being the darkest, but what is the difference between #6ab47a, and #a64ba7 (just flipping the values for each color)? I'm just looking for a few simple rules or guidelines to keep in mind when finding the right hexadecimal number without a chart on hand.