G RGB to YCbCr
Colour space converter. No parameters to adjust. By converting your image into YCbCr space, you can create process trees that affect only the luma or chroma, individually. For example, you could create a chroma blur, or affect the tones of an image without affecting the saturation. Use with the in-built RGB Split node to address the three channels separately, (R=Y, G=Cb and B=Cr) and the in-built RGB merge node to combine your image back together before converting back to RGB with the G YCbCr to RGB node.