Creating a mask from a graphics context
- by Magic Bullet Dave
I want to be able to create a greyscale image with no alpha from a png in the app bundle.
This works, and I get an image created:
// Create graphics context the size of the overlapping rectangle
UIGraphicsBeginImageContext(rectangleOfOverlap.size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
// More stuff
CGContextDrawImage(ctx,…