Well remember that we perceive color in reference to the colors around it. What he might pick on a color wheel might not seem all that blue when it is by itself or nearby other colors.
Bob On Jul 1, 2011, at 2:55 AM, Keith Clarke wrote: > Hi Tiemo, > Not a colour expert but it's an interesting problem - especially as > 'blueness' may be subjective. > > I visualise RGB values correlating with x, y, and z axis values of a colour > 'sphere' where the origin is black and the surface, at cube-root(r-cubed + > g-cubed + b-cubed) where r, g and b all = 255, is white. > > Maybe you can define a section of that sphere's volume which is consistently > blue in nature, given your target hues? Maybe the surface area of this > section volume is defined by a slice (what is a 3D 'chord'?) by specific > colours on the blue-red, blue-green spectra? > > That's probably all rubbish but you never know? :-) > Best, > Keith.. > > On 1 Jul 2011, at 10:39, Tiemo Hollmann TB wrote: > >> Hello, >> >> I am taking the mousecolor at different points from an image by script (not >> by clicking). I would like to analyse if the color I've taken is a "kind of >> blue", or another color. I want to change the backgroundcolor of an image. >> The background is always blue, but different blues and changing over the >> background. So what I want to do is to verify, what is background and what >> is foreground of my image. >> >> 100% pure blue would be 0,0,255. But for a human being 25,75,130 (greyblue) >> is also still blue, but 240,20,180 is pink, though the third RGB value is >> higher as in my greyblue. >> >> So I can't just check only the third RGB value, neither the sum or cross >> total. Has anybody ever heard, if you can define at all by math "what is >> blue"? >> >> Any color specialist around here? >> >> Tiemo > > > _______________________________________________ > use-livecode mailing list > [email protected] > Please visit this url to subscribe, unsubscribe and manage your subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode _______________________________________________ use-livecode mailing list [email protected] Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
