showColors

Visualize picture colors as an aid for painting

This function is meant to help artists recognize colors on a picture
Sometimes it is difficult to tell what color some part of a picture is.
With this function this should be easier. It takes the average color of
regions in the picture and shows the average in the whole region
It also shows the colors needed to make that color (in the
% Black-White-Yellow-Red-Blue system). The result uses at the most two of
the three colors and a combination of white and black if necessary
By repeatedly clicking on the figure, the color tip appears/dissapears