setTransfrom question!

Hi

I have an mc on stage with an linear gradient (2 colors), and i want to change the color of the gradient with setTransfrom, all work ok but the color i put in setTransfrom dont look right.
i put 1 color in ra,ga,ba and second color in rb,gb,bb

r g b color are from 0 255
but setTransfrom colors are
ra,ga,ga = -100/100
rb, gb , bb = -255/255

my first color is r:255 g:153 b:0 second color r:255,g:255,b:255

how to enter this two colors in setTransfrom and get the true colors.