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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