No, French Bulldogs like other dogs are not color blind.
French Bulldogs can see colour but not in the same way that we do because French Bulldogs have limited colour range comparative to humans.
For example, the human eye has “rods” and “cones” to help identify a colour.
Rods tell us how bright or dim something is (black or white) and cones allow us to differentiate red from blue, green from yellow, and the entire visual spectrum as we know it.
Humans have three types of cones, allowing us to see all the colors of the rainbow while dogs are limited to two cones, thus reducing the number of pigments they perceive.
Humans see the rainbow as red, orange, yellow, green, blue, indigo, violet whilst dogs see the colors of the world as basically yellow, blue and grey.
While French Bulldogs cannot see the same color spectrum as humans do, they are not color blind.
The dog’s eye can see much more than shades of grey. The take-home message is that French Bulldogs see blues and yellows much as we do.
Interestingly, ponder on this question
Do bright, shiny red balls and toys made for dogs appear boring and tame next to a bright blue or yellow plaything or not?