saturation(percentage)

Scales the color saturation of an image based on the given percentage.

percentage - Expects a decimal percentage, probably between 0.0 and 2.0. A value of 0.0 yields a grayscale image, 1.0 the original image, and 2.0 an image twice as saturated.

Without filter

With filter

http://thumbor-server/filters:saturation(0.20)/some/image.jpg