Table 3.6 Color operation types

species	contents
Translucent	Add the half of the background brightness and the half of the original picture brightness. , Draw the result in the frame buffer.
Half brightness	Draws the original picture in half in the frame buffer. Since the background is overwritten by , the background is not visible and the brightness of the original picture is halved.
Shadow	Redraw the half of the background brightness in the frame buffer. In this case, you can make a shadow of the character of the original picture. The original picture character is used only for the shape of the shadow , and the color data is ignored.
Gouraud shading	Draw the original picture with Gouraud shading in the frame buffer .
Gouraud shading Translucent	The brightness of the original picture multiplied by Gouraud shading is reduced by half. , Adds half the background brightness. The result is drawn in the frame buffer .
Gouraud shading Half brightness	Glow shading of the original picture is reduced by half , Draw in the frame buffer.