I'm stilll assuming it's the RGB table divided by 50. 5/5/5 instead of 255/255/255. Every fruit would add or subtract 51 of the real RBG value.

The standard chocobo colour is "desert yellow", I'm assuming every colour has its own unique name. They'd want a wide range of colours, 5/5/5 would result into 125 unique colours. Still seems like a lot, even though you could completely change the colour of your chocobo with 15 snacks or less.