Color.RGB (gb.web.form)
Static Function RGB ( Red As Integer, Green As Integer, Blue As Integer [ , Alpha As Integer ] ) As Integer
Returns a color value from its red, green, blue and alpha components.
If
Alpha is not specified, then it is assumed to be zero, i.e. you get a fully opaque color.
In Gambas, the alpha value of fully opaque colors is zero, and the alpha value of fully transparent colors is 255.