Keep only red channel of an image using GDI()

问题

I initially had a color image which i made it grayscale by copying only red channels i.e, first 8 bits of RGB(24bit). This was done as some processing required the image to be grayscale.After the processing i have to display this image on screen using GDI. So i have to copy put the gray values into red chanel of the final output. Something like setpixel(i,j,RGB(grayvalue,0,0)). How do i achieve this using GDI?

回答1:

As suggested by David, its been solved with solution mentioned in the following thread display red channel of image using GDI

来源：https://stackoverflow.com/questions/23051008/keep-only-red-channel-of-an-image-using-gdi