Houdini 22.0 Nodes Compositing nodes
Invert individual channels on an image
Similar to the Invert COP, but with switches to allow for just specific channels to be inverted. Handy in flipping normal maps' green channels.
Note
Replaced by 
Convert Normal COP in Copernicus.
Invert X
Inverts the Red Channel or the X Component of the normal map.
Invert Y
Inverts the Green Channel or the Y Component of the normal map. This is the most common operation for this node.
Invert Z
Inverts the Blue Channel or the Z Component of the normal map.
Imports geometry attributes as image planes using a UV attribute
Generates a blackbody ramp, or colorizes a black and white image with a blackbody ramp
Converts a single mosaic (flipbook/subuv) image into a sequence of sub images based on the frame
Generates a texture that can be used as a simple resolution checkerboard
Simple Helper Node to generate the default Normal Color
Overlays 2 normal maps together
Convert a grayscale image into a normal map
Invert individual channels on an image
Adjusts black point, white point, and midrange to increase, balance, or decrease contrast on a Normal Map.
Rotates a normal map while correcting recalculating it’s internal vectors
Ensures the normal map is balanced in a unit vector
Load Substance Archive (SBSAR) Files into COPs