Imagick::setSize()

(PECL imagick 2.0.0)

Sets the size of the Imagick object

说明

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。

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).

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'.....