Imagick::resampleImage

(PECL imagick 2, PECL imagick 3)

Imagick::resampleImage — Resample image to desired resolution

Description

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

Resample image to desired resolution.

Parameters

x_resolution
y_resolution
filter
blur

Return Values

Returns true on success.

Examples

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();
}

?>

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User Contributed Notes

simon

9 years ago

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

11 years ago

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

13 years ago

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');

?>