An important use case of the PXL tool is that even if you are not an experienced PXL script writer you can still use the PXL tool to quickly write a simple expression to create a basic effect. Use cases might be multiplying one of the pixel channels by a constant, or multiplying two input images together, or a simple conditional test to reveal out of gamut pixels as a false-color image. Typically, these PXL tools will not be reused.
Another important use case is where a PXL script will be written by an experienced developer, and distributed to others to be used in User mode. In such a case, an easy means of distribution is important. Distributing the PXL script alone is insufficient, as parameter names and min, max, default values will not be available. Tool presets allow users to name, save persistently, and distribute presets for any given Composite tool. This is exactly the functionality required for you to develop custom tools written with the PXL tool. You can write your own color corrector, keyer, or any other effect using a PXL script. You can then package it as a PXL tool preset.
You can load and save PXL tool presets using the Preset controls in the Tools Options area located at the far right of the tool UI—see Tool Presets.
