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Imagick::contrastStretchImage

PHP function Edit on GitHub ✎

(PECL imagick 2, PECL imagick 3)

Enhances the contrast of a color image

Description

Imagick::contrastStretchImage(float $black_point, float $white_point, int $channel = Imagick::CHANNEL_DEFAULT): bool

Enhances the contrast of a color image by adjusting the pixels color to span the entire range of colors available. 0x629

black_point: The black point.
white_point: The white point.
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. Imagick::CHANNEL_ALL. Refer to this list of channel constants.

Success

Source: reference/imagick/imagick/contraststretchimage.xml · from the official PHP manual (php/doc-en)