Custom effects is a collection of different effects, some are common tools such as brightness and saturations, others are more creative in nature, and a few are geared towards imitating typical low-fi and old screen characteristics. The idea is that you should use a number of these in combination to create a complex and good looking effect. You can add, remove and reorder the custom effects however you like. The order in wich the effects are applied can make a huge difference on the result. Below are a few good advice for better understanding of working with Custom Effects. For a full list of the effects: Custom Effects List
On each Custom Effect, you can choose between Pre CRT and Post CRT. See the scematic to the right to get a better picture of how the effects chain is structured. In the example below, it is visible that applying Saturation before and after the CRT gives a different result. Applying Saturation after CRT, it will appear significantly brighter, because of the boosting of each RGB component in the CRT pattern which in turn will translate to a “whiter” appearance.
Pre CRT Saturation Boost
Post CRT Saturation Boost
Applying desaturation before CRT, means the CRT will represent the different grayscales with the RGB pattern. This can introduce a sense of life and variation into the image, and colors will spring through at edges. Applying desaturation after the CRT, means the RGB components in the CRT pattern will be fully desaturated.