Imagick::linearStretchImage
(PECL imagick 2.0.0)
Imagick::linearStretchImage — Stretches with saturation the image intensity
说明
Imagick::linearStretchImage (
float
$blackPoint ,
float $whitePoint ) :
bool
Stretches with saturation the image intensity.
参数
-
blackPoint -
The image black point
-
whitePoint -
The image white point
返回值
成功时返回 TRUE。
范例
Example #1 Imagick::linearStretchImage()
<?php
function linearStretchImage($imagePath, $blackThreshold, $whiteThreshold) {
$imagick = new \Imagick(realpath($imagePath));
$pixels = $imagick->getImageWidth() * $imagick->getImageHeight();
$imagick->linearStretchImage($blackThreshold * $pixels, $whiteThreshold * $pixels);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>
