It's a little more challenging but one can make anaglyphs from the raw mastcam images. The difficulty is that the right image has about 3 time the resolution as the left image. But one can crop and resize the left image so both images cover the same field of view. Even though the left image isn't as detailed it still has some 3D information that is needed to construct the anaglyph. The eye can compensate some for defects in vision.