PYTHON Imagick::gammaImage

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PHP Imagick::gammaImage

PHP original manual for Imagick::gammaImage [ show | php.net ]

Imagick::gammaImage

(PECL imagick 2.0.0)

Imagick::gammaImageGamma-corrects an image

Description

bool Imagick::gammaImage ( float $gamma [, int $channel= Imagick::CHANNEL_ALL ] )
Warning

This function is currently not documented; only its argument list is available.

Gamma-corrects an image. The same image viewed on different devices will have perceptual differences in the way the image's intensities are represented on the screen. Specify individual gamma levels for the red, green, and blue channels, or adjust all three with the gamma parameter. Values typically range from 0.8 to 2.3.

Parameters

gamma

The amount of gamma-correction.

channel

Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Defaults to Imagick::CHANNEL_ALL. Refer to this list of channel constants.

Return Values

Returns TRUE on success.

Errors/Exceptions

Throws ImagickException on error.