Mark, you made my day! With this approach I even don't need to take the mousecolor anymore. I can just go with my blue and the threshold. Thanks, Tiemo
> -----Ursprüngliche Nachricht----- > Von: [email protected] [mailto:use-livecode- > [email protected]] Im Auftrag von Tiemo Hollmann TB > Gesendet: Freitag, 1. Juli 2011 12:41 > An: 'How to use LiveCode' > Betreff: AW: what RGB is blue? > > Thank you Mark, for your profound advice. > It sounds just as what I was looking for. I will give it a try > Thanks > Tiemo > > > -----Ursprüngliche Nachricht----- > > Von: [email protected] [mailto:use-livecode- > > [email protected]] Im Auftrag von Mark Schonewille > > Gesendet: Freitag, 1. Juli 2011 11:53 > > An: How to use LiveCode > > Betreff: Re: what RGB is blue? > > > > Tiemo, > > > > The distance between any colour (1) and a colour chosen by you (2; e.g. > r=0, > > g=0, b=255) can be calculated as > > > > sqrt((r1-r2)^2+(g1-g2)^2+(b1-b2)^2) <= T > > > > where T is a threshold between 0 and 442 set by you. Change the colour of > the > > background pixel whenever the distance between the colour of that pixel > and > > your selected colour is less than the threshold. > > > > I use this technique in Color Converter http://www.color-converter.com > > > > -- > > Best regards, > > > > Mark Schonewille > > > > Economy-x-Talk Consulting and Software Engineering > > Homepage: http://economy-x-talk.com > > Twitter: http://twitter.com/xtalkprogrammer > > KvK: 50277553 > > > > New: Download the Installer Maker Plugin 1.6 for LiveCode here > > http://qery.us/ce > > > > On 1 jul 2011, at 11:39, 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 _______________________________________________ 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
