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(PECL imagick 2.0.0)
Imagick::whiteThresholdImage — Force all pixels above the threshold into white
$threshold
)Is like Imagick::ThresholdImage() but force all pixels above the threshold into white while leaving all pixels below the threshold unchanged.
threshold
成功时返回 TRUE
。
版本 | 说明 |
---|---|
2.1.0 | Now allows a string representing the color as a parameter. Previous versions allow only an ImagickPixel object. |
Example #1 Imagick::whiteThresholdImage()
<?php
function whiteThresholdImage ( $imagePath , $color ) {
$imagick = new \ Imagick ( realpath ( $imagePath ));
$imagick -> whiteThresholdImage ( $color );
header ( "Content-Type: image/jpg" );
echo $imagick -> getImageBlob ();
}
?>
[#1] elmer at web-axis dot net [2008-11-30 15:32:53]
Here's a example of this function:
<?php
$img = new Imagick();
$img->readImage($image_file_name);
$img->whiteThresholdImage('grey');
$img->writeImage($thumb_file_name);
$img->clear();
$img->destroy();
?>