This effect changes the color saturation of images. It has only one property 'Color Saturation'. The lower the saturation level, the less colorful the processed image becomes. Full saturation 1.0 leaves the image unchanged, whereas zero saturation turns it into a gray scale image. Saturation has a maximum value of 1.0.

Saturation level 1.0 on the left, saturation 0.5 on the right