Imagick::contrastImageImagick::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 gegen die 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.
Rückgabewerte
Liefert TRUE bei Erfolg.
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Imagick::contrastStretchImage
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