The Imagick::brightnessContrastImage() function is an inbuilt function in PHP which accepts three parameters as Brightness, Contrast and Image channel. It is used to change the brightness, contrast of an image. This function converts the brightness and contrast of image into slope and intercept and call a polynomial function to apply the effect to the image.
bool Imagick::brightnessContrastImage( $brightness, $contrast, $channel )
Parameters: This function accepts three parameters as mentioned above and described below:
- $brightness: This parameter is used to store the value of the brightness.
- $contrast: This parameter is used to store the value of the contrast of the image.
- $channel: This parameter is used to store the value of the channel.
Return Value: This function returns True on success.
Below program illustrates the Imagick::brightnessContrastImage() function in PHP: