Thanks everyone. I had thought there might be a pre-existing API that would do this (I was half expecting to find a method defined for the NSColorList class...), but I will implement the euclidean distance test myself... Cheers Jonny.
On 17 Jun 2014, at 12:43, 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. > > Better methods may exist, consult a book on computer vision or fine arts > maybe? > > On Jun 17, 2014, at 18:52, Jonathan Taylor <jonathan.tay...@glasgow.ac.uk> > wrote: > >> Hi all, >> >> Is there a way of identifying the closest match to a given NSColor, out of a >> list of possible colors to match? The user could have selected any color >> using the color picker, but I would like to know whether it is >> "approximately red", green, blue or white. >> >> Of course, it might be e.g. magenta, and not really map well onto one of >> those four, but I would still be interested in knowing the best guess. It >> struck me that there might be an API for that, but I couldn't immediately >> find one. >> >> I could probably come up with a way of doing this myself, but thought I'd >> see if there was anything out there already. >> >> Cheers >> Jonny. >> _______________________________________________ >> >> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) >> >> Please do not post admin requests or moderator comments to the list. >> Contact the moderators at cocoa-dev-admins(at)lists.apple.com >> >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/cocoa-dev/xcvista%40me.com >> >> This email sent to xcvi...@me.com > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
