I think this was made from two separately taken snapshots.
I suppose the image pair of the anaglyph was not ideal, being composed of images with differing distance as well as lateral position, and that the anaglyph was optimized in some sense for the rover, which looks real good.
Not sure how all that works out though.
I’ve made anaglyphs myself. Of course you need two pictures, taken from a slightly different location but at the same angle. You convert one to red and the other to cyan and merge them. It’s tricky to get it just right though.