Change the image into a color scale. E.g Blue Mess around with the RGB value, placing the color variable in two place to get different colours.
REM BLUE
lOAD BITMAP <IMAGE HERE>
FOR X=0 TO 640
FOR Y=0 TO 480
COLOR=POINT(X,Y)
INK RGB(0,0,color),0
DOT X,Y
NEXT Y
NEXT X
DO
LOOP
REM RED
lOAD BITMAP <IMAGE HERE>
FOR X=0 TO 640
FOR Y=0 TO 480
COLOR=POINT(X,Y)
INK RGB(color,0,0),0
DOT X,Y
NEXT Y
NEXT X
DO
LOOP
REM GREEN
lOAD BITMAP <IMAGE HERE>
FOR X=0 TO 640
FOR Y=0 TO 480
COLOR=POINT(X,Y)
INK RGB(0,Color,0),0
DOT X,Y
NEXT Y
NEXT X
DO
LOOP