Just Change the sliders to get two colours and generate a gradient bar Switching might change the middle colour as the starting side usually have less colour How it works (also why it have "bugs") : Change the colour's red until it is the second colour's Change the colour's green until it is the second colour's Change the colour's blue until it is the second colour's
Thanks for griffpatch for the RGB How it works: RRGGBB B*(16^0)+ G*(16^2)+ R*(16^4)= RGB colour