# Differences

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 — blog:2021:09:08:2021-09-08_-_shoe_color [2021/09/08 20:02] (current)basz created 2021/09/08 20:02 basz created 2021/09/08 20:02 basz created Line 1: Line 1: + ====== 2021-09-08 - shoe color ====== + shoe colors? seriously? yes... but obviously not because of a shoe. interestingly,​ not quite about a color either... so let's start. + + some time ago i was asked by a friend of mine, what is the collor of this shoe: + + {{:​blog:​2021:​09:​08:​shoe_color.png|what color is this shoe?}} + + turns out that this was a fairly common photo sent around on the internet, around 1-2yrs ago. + + it's pink to me. but it turns out that many ppl see it as gray, instead. so it got me thinking... + + + ===== 1st approach ===== + + my 1st guess was that it's the same thing as with blue and green colors. the wavelengths of these two colors are next to each other, so around midway in between "​perfect blue" and "​perfect green",​ some ppl see "still green" yet others already interpret it as "​already blue". it's not so obvious however with gray and pink (not to mention shades), as these are not monochromatic. + + + ===== 2nd approach ===== + + these must be close to each other in color space, then! so let's see how our [[https://​www.color-hex.com/​color/​c4aead|pink-ish]] and [[https://​www.color-hex.com/​color/​808080|grey]] look like: + + * "​silver pink" = 196, 174, 173 + * "​gray"​ = 128, 128, 128 + + ok -- not exactly the same, but also not super far away... + + let's give it a shot in another color model, namely HSL/HSV: + + * "​silver pink" = 3deg, 12%, 77% + * "​gray"​ = 0deg, 0%, 50% + + now the proximty can be seen much better! only the last parameter is off by around 1/4. + + due to the above, there are some "​shares of pink", like [[https://​en.wikipedia.org/​wiki/​Shades_of_pink#​Silver_pink|silver pink]] that could be considered a bit more gray. thus the confusion.