Imagick::sampleImage
If using the fit-parameter this function sometimes seems not to work when one of the two sizes (width or height) is the same size as the image has. For example:
<?php
$image = new Imagick('800x480.jpg');
$image->scaleImage(640, 480, true);
// $image is still 800x480
?>
You have to calculate the new sizes yourself and use false for $fit in this case.
Imagick::scaleImage
(PECL imagick 2.0.0)
Imagick::scaleImage — Scales the size of an image
Description
bool Imagick::scaleImage
( int
$cols
, int $rows
[, bool $bestfit = false
] )Scales the size of an image to the given dimensions. The other parameter will be calculated if 0 is passed as either param.
Note: The behavior of the parameter
bestfitchanged in Imagick 3.0.0. Before this version given dimensions 400x400 an image of dimensions 200x150 would be left untouched. In Imagick 3.0.0 and later the image would be scaled up to size 400x300 as this is the "best fit" for the given dimensions. Ifbestfitparameter is used both width and height must be given.
Parameters
-
cols -
-
rows -
-
bestfit -
Return Values
Returns TRUE on success.
Errors/Exceptions
Throws ImagickException on error.
Changelog
| Version | Description |
|---|---|
| 2.1.0 | Added optional fit parameter. This method now supports proportional scaling. Pass zero as either parameter for proportional scaling. |
add a note
User Contributed Notes
Imagick::scaleImage
peter at icb dot at
22-Sep-2009 05:25
octave at web dot de
23-Jul-2009 02:57
When using the "fit = true" option, the image will only scale down, but never scale up:
<?php
$im = new Imagick('1600x1200.jpg');
$im->scaleImage(2000, 1500, true); // => 1600x1200
$im->scaleImage(1000, 500, true); // => 666x500
?>
benford at bluhelix dot com
16-Jun-2009 08:38
If anyone finds "The other parameter will be calculated if 0 is passed as either param. " to be a bit confusing, it means approximately this:
<?php
$im = new Imagick('example.jpg');
$im->scaleImage(300, 0);
?>
This scales the image such that it is now 300 pixels wide, and automatically calculates the height to keep the image at the same aspect ratio.
<?php
$im = new Imagick('example.jpg');
$im->scaleImage(0, 300);
?>
Similarly, this example scales the image to make it 300 pixels tall, and the method automatically recalculates the image's height to maintain the aspect ratio.
vincent dot hoen at gmail dot com
02-Aug-2007 06:37
Here is an easy way to resize an animated gif :
$picture = new Imagick('animated_gif.gif');
foreach($picture as $frame){
$frame->scaleImage($width, $height);
}