A very useful feature would be the capability to delete a specific color. V3D does this with primary colors, but not with secondary, tertiary, etc. colors. The color to be deleted could be "registered" by clicking on the spot containing that color.After processing the color, nearby pixels of that approximate color would be deleted. The program would have to be sufficiently sophisticated to accommodate shifts in color due to ramping. These shifts can be quite dramatic through the depth of a sample, so the program would have to recognize transitions along a path initiated by a single point and adjust its deletion criteria according to these color shifts. This capability would enable the user to simplify a complex image by removing "clutter," or irrelevant data.