In part 1 of this series I gave a basic look at how a preset filter can be edited and how to save an edited filter as a preset. In part 2 Which I have done in video form I delve into the steps to create a preset from scratch and how to adjust the different layers in a filter using the transparency tool.
I apologize for the barking dog near the end, I was runningout of time to get the video done. The filter I created in the video plus a couple more can be downloaded in a free pack here https://www.xaramarketplace.com/product/free-preset-pack/