Contrast

Brightness correction

To adjust the contrast, you can use the contrast filter and set the desired adjustment value.

contrast=X

Examples

Preview	Syntax
	Original image: /sample.li/frog.png?w=400
	Increased contrast: /sample.li/frog.png?w=400&contrast=30
	Decreased contrast: /sample.li/frog.png?w=400&contrast=-10