To me, that's the real kicker; there's absolutely no cost whatsoever to respecting the wishes.
If anything, it's not a great image; the standard scan is a bit washed out and doesn't have a full color range. (I can't speak to whether this is a characteristic of the scan, which is now from a very old scanner, or the original image, having never seen the original in print.) No one test image can capture everything an image algorithm might want to test, but more full use of available colors would probably still be advantageous.
If anything, it's not a great image; the standard scan is a bit washed out and doesn't have a full color range. (I can't speak to whether this is a characteristic of the scan, which is now from a very old scanner, or the original image, having never seen the original in print.) No one test image can capture everything an image algorithm might want to test, but more full use of available colors would probably still be advantageous.