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。

示例

示例 #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 3 notes

down

simon ¶

7 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.

down

bleighty at dvidshub dot net ¶

9 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

down

-3

anagai at yahoo dot com ¶

11 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');

?>

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