php教程

Imagick::resampleImage

(PECL imagick 2.0.0)

Imagick::resampleImageResample image to desired resolution

说明

Imagick::resampleImage ( float $x_resolution , float $y_resolution , int $filter , float $blur ) : bool

Resample image to desired resolution.

参数

x_resolution

y_resolution

filter

blur

返回值

成功时返回 TRUE

范例

Example #1 Imagick::resampleImage()

<?php
function resampleImage($imagePath) {
    
$imagick = new \Imagick(realpath($imagePath));

    
$imagick->resampleImage(200200, \Imagick::FILTER_LANCZOS1);
    
header("Content-Type: image/jpg");
    echo 
$imagick->getImageBlob();
}

?>

User Contributed Notes

simon 01-Dec-2015 12:13
Please not that I had extremely high CPU usage using this function on Ubuntu linux 15.10. Switching to the resizeImage function fixed the problem.
bleighty at dvidshub dot net 22-Nov-2013 02:53
Please note that blur of 1 should not affect the image if I'm understanding correctly from this page:
http://www.php.net/manual/en/imagick.resizeimage.php
anagai at yahoo dot com 02-Dec-2011 12:14
Lets say you want to reduce the resolution of uploaded images for the web.

The following will load a image at whatever resolution and resample it down to 72 dpi and save as a different file.

The dpi for setImageResolution() and resampleImage() should be whatever dpi your resampling too.

<?php
$image
= new Imagick();
$image->readImage('image.jpg');
$image->setImageResolution(72,72);
$image->resampleImage(72,72,imagick::FILTER_UNDEFINED,0);
$image->writeImage('image72.jpg');
?>

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