Imagick::resampleImage

(PECL imagick 2, PECL imagick 3)

Imagick::resampleImage — Resample image to desired resolution

说明

public 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(200, 200, \Imagick::FILTER_LANCZOS, 1);
    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');


?>