文字
Imagick::whiteThresholdImage
(PECL imagick 2.0.0)
Imagick::whiteThresholdImage — Force all pixels above the threshold into white
说明
bool Imagick::whiteThresholdImage
( mixed
$threshold
)Is like Imagick::ThresholdImage() but force all pixels above the threshold into white while leaving all pixels below the threshold unchanged.
参数
-
threshold -
返回值
成功时返回 TRUE 。
更新日志
| 版本 | 说明 |
|---|---|
| 2.1.0 | Now allows a string representing the color as a parameter. Previous versions allow only an ImagickPixel object. |
范例
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 ();
}
?> 用户评论:
[#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();
?>