Imagick::contrastStretchImage
(No version information available, might be only in CVS)
Imagick::contrastStretchImage — Enhances the contrast of a color image
Description
bool Imagick::contrastStretchImage
( float $black_point
, float $white_point
[, int $channel
] )
WarningThis function is
currently not documented; only its argument list is available.
Enhances the contrast of a color image by adjusting the pixels
color to span the entire range of colors available
Parameters
-
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. Defaults to Imagick::CHANNEL_ALL. Refer to this
list of channel constants.
Return Values
Returns TRUE on success.
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