»Prisma« is a programme created with Processing that uses the integrated camera of the computer for recording a video signal. The values of red, green and blue are extracted from this signal. All values of each color are then calculated together and resulting in an average value for R, G and B.
These determined values are then visualized in several graphs and used for brightness / saturation and the amplitude of the graphs.
This means: the more color shares are available the higher the peak of the amplitude and the saturation of the curve.