v.hslhistogram v.hslhistogram performs a 3 dimensional histogram according to hue, saturation and luminance. v.hslhistogram performs a 3 dimensional histogram according to hue, saturation and luminance. The result is output as a 2-dimensional video frame with hue represented in the x axis, and the y-axis grouped into 8 saturation sections, which are themselves each made up of 8 lines of video representing 8 levels of luminance. This image is mostly useful only as a monitor. Hue is divided into 64 sections while saturation and luminance are divided into 8. The hue saturation and luminance of the most common colour is output as well. If the range of colour is limited, the resolution in that range can be increase so that the whole resolution of the histogram is used to encode and evaluate the desired range.

from the library : softVNS Format : External Environment : jitter / max commercial Max 4.x http://homepage.mac.com/davidrokeby/softVNS.html