You can apply sharpen to node 02 and denoise/blur to node 04, but you can also do that in a single node anyway by selecting LAB space, and deactivating the channels as required. One such use is adding a look LUT to a node before node 04, to see the colour without disturbing the gamma. This process separates the chroma and luma into different streams before uniting them again. In the actual Layer node Add is selected as the composite mode. Node 02 has saturation down to 0 so it's just a b/w image, and in node 04 in the Primary Bars section the Y bar of Gain is turned all the way down (leaving just colour information). Ignore the splitter combiner in the middle for the time being, and pay attention to nodes 02 and 04, which are the two components of a layer node. Nothing particularly special, but it might be of use in some situations. Here's another bonus node tree I put together not that long ago. I included the Lum Mix figure in the bottom left, not because it's necessary for this process, but because it is involved when attempting to reverse engineer colour information. 100 to 50 cancels the effect of the curve, and 50 to 0 reverses it. The trick is to bring all the values in the custom panel from 100 to 0. However, the resulting curve in the node represents a Rec709 to LogC transfer, which is the reverse of what we're after. Trying to reverse engineer the LUT in a node after it would not work, as LUTs clip information above 1.0 (in most cases) and that information cannot be retrieved. Use two nodes in the node graph, and in the second node place the LogC to Rec709 1D LUT. There should be a straight diagonal in the waveform scope, as to be expected. There is a way around it though.Ĭome out of DaVinci YRGB Color Managed, and select the grey ramp. However, reverse engineering the tone curve of a LUT is not so straight forward, especially if it's a log to lin/rec709 transfer. Back in the 7th post I gave an example of how to reverse engineer the LogC to Rec709 tone curve in Resolve.
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