2017-03-12, 01:16 AM
The most grain is always in the blue layer, when doing noise reduction you can often get away with just processing the blue layer by itself.
Our eyes are also least receptive to resolution of the blue layer, so you can soften it more than other layers before our eyes/brain will perceive a difference.
On old CRT projectors, they used to a a switch to blur the blue signal on purpose. You would focus each Red, Green and Blue CRT until it was really sharp, and then flick the switch to blur the blue channel for normal viewing.
I'm still doing a bit of a write up, but most of what has been written here is mostly correct. To do re-graining correctly you need to apply it by colour layer, but also separately for low, middle and high exposure areas as they grain is different depending on exposure levels. This is easy enough to do in something like Resolve, I'll see if I can make up a generic process tree for it.
Our eyes are also least receptive to resolution of the blue layer, so you can soften it more than other layers before our eyes/brain will perceive a difference.
On old CRT projectors, they used to a a switch to blur the blue signal on purpose. You would focus each Red, Green and Blue CRT until it was really sharp, and then flick the switch to blur the blue channel for normal viewing.
I'm still doing a bit of a write up, but most of what has been written here is mostly correct. To do re-graining correctly you need to apply it by colour layer, but also separately for low, middle and high exposure areas as they grain is different depending on exposure levels. This is easy enough to do in something like Resolve, I'll see if I can make up a generic process tree for it.