G Chroma Sharpen

This is a very powerful tool to help correct the problems created by chroma sub-sampled video sources, whether they be 4:2:2, 4:1:1 or 4:2:0 or 3:1:1. It works by analyzing the luma of the image as a guide to the reconstruction of the sub-sampled chroma information. This node can be extremely useful in correcting colour bleeding. Note: if the chroma of the video source that you are attempting to correct is not smoothed (for instance video from Apple DV codec), place the appropriate G Chroma Smooth node ahead of the G Chroma Sharpen in the process tree. You can use the G RGB to YCbCr node in conjunction with G Chroma Sharpen to help you see exactly what this node is doing to the chroma. It's quite a surprise to see how bad and blurry the chroma of most video is, and how sharp and nice it can be after applying this node.