I don't believe they are. They say deer are color blind too but we had a pet deer when I was a kid. We fed it only green, peanut m&ms once, the green ones were her share, and if you gave it a choice it would pick only the green ones out of your hand after that.
In Montana we have to wear hunter orange during rifle season and they can definitely pick you our better when you are in orange rather than earth tones, even the orange camo that's supposed to work because they are color blind.
Animals may see differently, but I don't think they are truly color blind like black and white based on my experiences.