Imagick
PHP Manual

Imagick::normalizeImage

(PECL imagick 2.0.0)

Imagick::normalizeImageEnhances the contrast of a color image

说明

bool Imagick::normalizeImage ([ 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.

参数

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. Refer to this list of channel constants.

返回值

成功时返回 TRUE

范例

Example #1 Imagick::normalizeImage()

<?php
function normalizeImage($imagePath$channel) {
    
$imagick = new \Imagick(realpath($imagePath));
    
$original = clone $imagick;
    
$original->cropimage($original->getImageWidth() / 2$original->getImageHeight(), 00);
    
$imagick->normalizeImage($channel);
    
$imagick->compositeimage($original, \Imagick::COMPOSITE_ATOP00);
    
header("Content-Type: image/jpg");
    echo 
$imagick->getImageBlob();
}

?>


Imagick
PHP Manual