Imagick::resampleImage
(PECL imagick 2, PECL imagick 3)
Imagick::resampleImage — 画像を指定した解像度にリサンプリングする
説明
public Imagick::resampleImage(
float
float
int
float
): bool
float
$x_resolution,float
$y_resolution,int
$filter,float
$blur): bool
画像を指定した解像度にリサンプリングします。
パラメータ
x_resolution-
y_resolution-
filter-
blur-
戻り値
成功した場合に true を返します。
例
例1 Imagick::resampleImage()
<?php
function resampleImage($imagePath) {
$imagick = new \Imagick(realpath($imagePath));
$imagick->resampleImage(200, 200, \Imagick::FILTER_LANCZOS, 1);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>
＋add a note
User Contributed Notes 3 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');
?>