问题
I have 24 bit RGB image.I want to display only the red channel onto the display using GDI. Should i use palette for that? What is the strategy to be used?
Please guide me appropriately.
回答1:
The quickest way is to use BitBlt. Create another 24 bit bitmap of the same size as your RGB image. Fill it with pure red. Then use BitBlt with SRCAND. As described in the documentation this
Combines the colors of the source and destination rectangles by using the Boolean AND operator.
来源：https://stackoverflow.com/questions/23052165/display-red-channel-of-image-using-gdi