Imagick::setSize

(PECL imagick 2, PECL imagick 3)

Imagick::setSize — Sets the size of the Imagick object

说明

public Imagick::setSize ( int $columns , int $rows ) : bool

Sets the size of the Imagick object. Set it before you read a raw image format such as RGB, GRAY, or CMYK.

参数

columns
rows

返回值

成功时返回 true。

User Contributed Notes

Ade 31-Mar-2017 09:40


This function is not working for me at all.

I am trying to generate Images from a PDF and this function does literally NOTHING, even it returns 'true'.....

Mike Pratt 25-Sep-2012 05:48


Using setSize before reading an image file tells ImageMagick to resize the image immediately on load - this can give a substantial increase in performance time and save memory and disk resources for large images:



<?php



$image = new Imagick();

$image->setSize(800,600);

$image->readImage($file);



?>



This might also save you having to call thumbnailImage to resize the image. 



On my server, this only made a difference with jpgs - pngs and gifs were loaded at full size which took much longer (30s or more compared to 6s for a similar sized jpg).