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Imagick::adaptiveResizeImage

(PECL imagick 2, PECL imagick 3)

Imagick::adaptiveResizeImage — Adaptively resize image with data dependent triangulation

说明

public function Imagick::adaptiveResizeImage(
    int $columns,
    int $rows,
    bool $bestfit = false,
    bool $legacy = false
): bool

Adaptively resize image with data-dependent triangulation. Avoids blurring across sharp color changes. Most useful when used to shrink images slightly to a slightly smaller "web size"; may not look good when a full-sized image is adaptively resized to a thumbnail. 此方法在Imagick基于ImageMagick 6.2.9以上版本编译时可用。

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

columns

The number of columns in the scaled image.

rows

The number of rows in the scaled image.

bestfit

Whether to fit the image within the given dimensions while preserving the aspect ratio.

legacy

Optional bool parameter. If set to true, the calculations are done with the small rounding bug that existed in Imagick before 3.4.0. If set to false, the calculations should produce the same results as the ImageMagick command-line tools.

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.
PECL imagick 2.1.0 This method now supports proportional scaling. Pass zero as either parameter for proportional scaling.
PECL imagick 3.4.0 Added the legacy parameter.

示例

示例 #1 Using Imagick::adaptiveResizeImage()

Resize an image to a standard size for the web. This method works best when resizing to a size only slightly smaller than the previous image size. 

<?php
header('Content-type: image/jpeg');

$image = new Imagick('image.jpg');
$image->adaptiveResizeImage(1024,768);

echo $image;
?>

参见