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PHP Dokumentation: Function imagick-contraststretchimage

12. Januar 2010 von werner

Imagick::contrastStretchImage

(PECL imagick 2.0.0)

Imagick::contrastStretchImage — Enhances the contrast of a color image

Beschreibung

bool Imagick::contrastStretchImage ( float $black_point , float $white_point [, int $channel = Imagick::CHANNEL_ALL ] )

Enhances the contrast of a color image by adjusting the pixels color to span the entire range of colors available. Diese Funktion ist verfügbar, wenn Imagick gegendie ImageMagick Version 6.2.9 oder höher kompiliert wurde.

Parameter-Liste

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.