fcontrast[0 .. 100]

Adapts the contrast of the image.

//width/500/n/sample.li/frog.png

//width/500/fcontrast30/sample.li/frog.png

fbright[0 .. 255]

Adapts the brightness of the image.

/width/500/n/sample.li/frog.png

/width/500/fbright50/sample.li/frog.png

Combine fcontrast and fbright

Both filters can be combined: fcontrast30.fbright50

/width/500/fcontrast30.fbright50/sample.li/frog.png