[edit] Last updated: Fri, 25 May 2012

Imagick::setImageCompressionQuality

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Imagick::setImageCompressionQuality — 画像の圧縮品質を設定する

説明

bool Imagick::setImageCompressionQuality ( int $quality )

画像の圧縮品質を設定します。

パラメータ

quality: 画像の圧縮品質を表す整数値。

返り値

成功した場合に TRUE を返します。

エラー / 例外

エラー時に ImagickException をスローします。

add a note User Contributed Notes Imagick::setImageCompressionQuality

snipes2083 [at] yahoo com 28-Mar-2010 05:35


This example shows how to set the compression type, set the compression quality, create a thumbnail and remove unnecessary data in order to reduce file size.





This will use the following functions in reference:


Imagick::setImageCompression


Imagick::setImageCompressionQuality


Imagick::stripImage


Imagick::thumbnailImage


Imagick::writeImage





<?php


    $image = 'image.jpg';


    $directory = '/path/to/image';


    $image_location = $directory . "/" . $image;


    $thumb_destination = $directory . "/t" . $image;


    $compression_type = Imagick::COMPRESSION_JPEG;


   


    $im = new Imagick($image_location);


    $thumbnail = $im->clone;





    $thumbnail->setImageCompression($compression_type);


    $thumbnail->setImageCompressionQuality(40);


    $thumbnail->stripImage();


    $thumbnail->thumbnailImage(100,null);


    $thumbnail->writeImage($thumb_destination);


?>





Now, obviously you don't have to do so much with the variables and the file location.  I only used so many to demonstrate where the images are coming from and where they are going.





NOTE:  The $thumbnail->thumbnailImage(100,null); keeps the aspect ration by setting the second parameter to null.  Read about this at Imagick::thumbnailImage





There is another way to create thumbnails that works quite well if you want to crop the image rather than using the entire image.  Check out Imagick::cropThumbnailImage

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