Nice problem! ...Depends what you mean by color. Jops can provide a lightness histogram and waveform. Also a vectorscope that expresses the hue and saturation combined.
If it is just hue that you are interested in... You might try the following: From the top of my head: - Factor the rgb by the saturation values. This Will return an image in which the unsaturated values are entirely black. These need to be removed so as to remove all perceptually neutral values from consideration. - Then ColorSpace conversion to HSV. - Plot the H channel as a histogram. This will give you an indication of the hue distribution in the image. Doubtless there is a slicker method. Sent from my iPad On 11 Sep, 2012, at 10:51 PM, adamteale <[email protected]> wrote: > Hey Guys, > > I am trying to find out if it is possible to compare 2 images in Nuke. > > For example I would like to compare an image against a colorwheel, and have > the colorwheel only show the colours that the image and it have in common. > > I tried running a sampler pixel by pixel over the image to gather an array of > RGB values, then i thought i could somehow use a mergeExpression to compare > against the values, but then i realised i had no idea how to do that. > Also to run a sampler pixel by pixel is super super slow. > > Any one catch what I mean? Any ideas? > > Cheers! > > Adam > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users _______________________________________________ Nuke-users mailing list [email protected], http://forums.thefoundry.co.uk/ http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
