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
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