Imagick
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Imagick::resampleImage

(PECL imagick 2.0.0)

Imagick::resampleImage — Resample image to desired resolution

说明

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

Resample image to desired resolution.

参数

x_resolution

y_resolution

filter

blur

返回值

成功时返回 TRUE .

Imagick
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PHP手册
PHP手册 - N: Resample image to desired resolution

用户评论:

anagai at yahoo dot com (02-Dec-2011 08:14)

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');
?>