Color.Merge (gb.image)
Static Function Merge ( Color1 As Integer, Color2 As Integer [ , Weight As Float ] ) As Integer
Returns a mix between 
Color1 and 
Color2.
Weight is the relative weight of the second color, between 
0 and 
1.
In other words, if 
Weight is 
0, then 
Color1 is returned. If 
Weight is 
1, then 
Color2 is returned.
And otherwise a color between 
Color1 and 
Color2 is returned.
If the weight is not specified, it is assumed to be 
0.5.