PHP - Manual: Imagick::scaleImage

2024-11-14

Imagick::scaleImage

(PECL imagick 2, PECL imagick 3)

Imagick::scaleImage — Scales the size of an image

说明

public Imagick::scaleImage(
    int $cols,
    int $rows,
    bool $bestfit = false,
    bool $legacy = false
): bool

Scales the size of an image to the given dimensions. The other parameter will be calculated if 0 is passed as either param.

注意: 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
PECL imagick 2.1.0	Added optional fit parameter. This method now supports proportional scaling. Pass zero as either parameter for proportional scaling.

范例

示例 #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();
}

?>

add a note

User Contributed Notes 6 notes

down

benford at bluhelix dot com ¶

13 years ago


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.

down

vincent dot hoen at gmail dot com ¶

14 years ago


Here is an easy way to resize an animated gif : 

$picture = new Imagick('animated_gif.gif');

foreach($picture as $frame){
    $frame->scaleImage($width, $height);
}

down

agamemnus at flyingsoft dot pw ¶

8 years ago


Warning: this will blur your edges in possibly unexpected ways. For better control, use resizeImage, instead.

down

octave at web dot de ¶

12 years ago


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
?>

down

clickconvert at gmail dot com ¶

9 years ago


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();

?>

down

-4

peter at icb dot at ¶

12 years ago


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.

add a note

官方地址：https://www.php.net/manual/en/imagick.scaleimage.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库面试 C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 adodb手册 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 opcache预加载 Composer的Packagist资源 mysql面试题 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式 PHP7添加redis扩展 PHP mkdir()写出来的权限与mode值不符合 Packagist / Composer 中国全量镜像 php中几种注释规范利用php soap实现web service PHP获取指定函数定义在哪个文件中及行号

略微加速

PHP官方手册 - 互联网笔记

Imagick::scaleImage

说明

参数

返回值

错误／异常

更新日志

范例

User Contributed Notes 6 notes