Square rooting is slow, and not calculating square root do not throw off comparison.
On Jun 17, 2014, at 21:14, Mills, Steve <smi...@makemusic.com> wrote: > On Jun 17, 2014, at 06:43:54, Maxthon Chan <xcvi...@me.com> wrote: > >> One easy-to-implement method: colour cube. >> >> Define a colour using its RGB values as a 3-tuple (r, g, b) and standard >> colours (ri, gi, bi) (where i = 0..n).The square distance between the given >> colour and a standard colour is (ri-r)^2+(gi-g)^2+(bi-b)^2. You can >> calculate square distances between the given colour and each of the standard >> colours, and the one with the minimal squared distance is the best match. > > The algorithm I've seen then takes the square root of that value. > > -- > Steve Mills > office: 952-818-3871 > home: 952-401-6255 >
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