increase image contrast
decrease image contrast
auto optimize image levels
"highkey" contrast effect
| unprocessed image |
imageFilterContrast( $image, 2.0, 2.0, 2.0 ) increase image contrast |
imageFilterContrast( $image, - 2.0, - 2.0, - 2.0 ) decrease image contrast |
|
imageFilterOptimize auto optimize image levels |
imageFilterContrast( $image, 4.0, 4.0, 4.0 ) "highkey" contrast effect |