Colour isn't right (SOLVED)


#1

So i was working on this sprite yesterday and when i went back to it today and lowered the shade of a colour it turns gray rather than the darker shade. It seems to be locked to the pallette how do i unlock it?

EDIT: Sorry i have fixed it now, feel abit stupid lol:
go into the sprite tab at the top of the screen and then colour mode and change it from Indexed to RGB