Imagick::scaleImage
(PECL imagick 2.0.0)
Imagick::scaleImage — Scales the size of an image
说明
$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: 参数
bestfit的特性在 Imagick 3.0.0 中已改变。在此版本以前，当目标尺寸设为 400x400 时，原尺寸为 200x150 的图像将不会被改变。自 Imagick 3.0.0 起，源图像将会被放大到 400x300 因为这将更好的适合目标尺寸。当使用参数bestfit时，必须同时给出宽度和高度。
参数
-
cols -
-
rows -
-
bestfit -
返回值
成功时返回 TRUE 。
错误／异常
错误时抛出 ImagickException。
更新日志
| 版本 | 说明 |
|---|---|
| 2.1.0 | Added optional fit parameter. This method now supports proportional scaling. Pass zero as either parameter for proportional scaling. |
范例
Example #1 Imagick::scaleImage()
<?php
function scaleImage ( $imagePath ) {
$imagick = new \ Imagick ( realpath ( $imagePath ));
$imagick -> scaleImage ( 150 , 150 , true );
header ( "Content-Type: image/jpg" );
echo $imagick -> getImageBlob ();
}
?> 用户评论:
[#1] agamemnus at flyingsoft dot pw [2014-03-15 15:34:48]
Warning: this will blur your edges in possibly unexpected ways. For better control, use resizeImage, instead.
[#2] clickconvert at gmail dot com [2012-11-08 21:50:20]
Need to resize portrait and landscape images (and convert to 72ppi)? These will fit an area of 800x600 without distorting, no matter how tall or wide.
<?php
$img = new Imagick($img_loc.$file);
$img->setImageResolution(72,72);
$img->resampleImage(72,72,imagick::FILTER_UNDEFINED,1);
$img->scaleImage(800,0);
$d = $img->getImageGeometry();
$h = $d['height'];
if($h > 600) {
$img->scaleImage(0,600);
$img->writeImage($resized_loc.$file);
} else {
$img->writeImage($resized_loc.$file);
}
$img->destroy();
?>
[#3] peter at icb dot at [2009-09-22 05:25:10]
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.
[#4] octave at web dot de [2009-07-23 02:57:39]
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
?>
[#5] benford at bluhelix dot com [2009-06-16 08:38:46]
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.
[#6] vincent dot hoen at gmail dot com [2007-08-02 06:37:20]
Here is an easy way to resize an animated gif :
$picture = new Imagick('animated_gif.gif');
foreach($picture as $frame){
$frame->scaleImage($width, $height);
}