http://origin.mars5.jpl.nasa.gov/gallery/edr_filename_key.html
The image on this site have the filter and sometimes the Left or Right designator removed. If L or R is missing, then they were taken with the Left camera, which uses visible light filters.
These images were taken with the panoramic camera, because it's the one that uses color filters. The filters used vary from image to image. The available filters are:
| Left Camera | Right Camera |
| 1 = EMPTY (clear) | 1 = 436nm (37nm Short-pass) |
| 2 = 753nm (20nm bandpass) | 2 = 754nm (20nm bandpass) |
| 3 = 673nm (16nm bandpass) | 3 = 803nm (20nm bandpass) |
| 4 = 601nm (17nm bandpass) | 4 = 864nm (17nm bandpass) |
| 5 = 535nm (20nm bandpass) | 5 = 904nm (26nm bandpass) |
| 6 = 482nm (25nm bandpass) | 6 = 934nm (25nm bandpass) |
| 7 = 432nm (32nm Short-pass) | 7 = 1009nm (38nm Long-pass) |
| 8 = 440nm (20) Solar ND 5.0 | 8 = 880nm (20) Solar ND 5.0 |
Some bandwidths of visible light are:
| red | 650 |
| orange | 590 |
| yellow | 570 |
| green | 510 |
| blue | 475 |
| indigo | 445 |
| violet | 400 |
Everything gets kind of fuzzy from this point on. The visible light bandwidths are not even sharply delimited. The bandwidths in the Martian cameras don't necessarily match the color bandwidths on Earthling computers. In a lot of the images some of the bandwidths are missing. For example, this image:
only uses filters 4, 5, and 7, which more or less correspond to reddish-orange, yellow-green, and violet. There is a hole or two in the spectrum, notably red and blue, so it ends up looking a little weird. But it's still much better than black and white.
Some of the images from Mars use filters 2, 5, and 7, or some wide range like that. This provides more information for scientific analysis, but it doesn't look normal when combined. That is, if there is a "normal" for pictures from Mars. I skipped most of these.