Gray Anaglyph

This Generator maps all colors into some shade of gray. It works well if you are fine with the lack of color in the result.

Start with the same right and left images:

four cubes with black edges. Going clockwise from the upper left, the cube faces are red, green, gray, and blue.four cubes with black edges. Going clockwise from the upper left, the cube faces are red, green, gray, and blue.

Filter each image. For this Generator, all colors are mapped to a shade of red or a shade of cyan.

four cubes with black edges and red background. Going clockwise from the upper left, the cube faces are all shades of red.four cubes with black edges and cyan background. Going clockwise from the upper left, the cube faces are all shades of cyan.

Add the two images together, yielding:

four cubes with black edges. All the cube faces are shades of gray.

Add finishing touches to the result with the postDraw method:

four cubes with black edges. All the cube faces are shades of gray.

With red-cyan 3D Glasses all of the cubes look gray. Generally the results will look reasonable regardless of what colors are in the sketch.