Upscale Shaders
Performs super-resolution. Doubles image size with the expectation that the low resolution image is artifact-free. (I.e. No noise, blur or any other degradation.)
Any degradation remaining on the image will be amplified. It is better to use other shaders first to reduce noise or blur.
CNN_M and CNN_L variants also introduces small amounts of checkerboard artifacts due to the pixelshuffle layer and the low parameter count.
As this shader doubles the image size and quadruples the number of pixels, other shaders placed after this will be 4x slower.