Imagick::adaptiveResizeImage

(PECL imagick 2.0.0)

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

说明

bool Imagick::adaptiveResizeImage ( int $columns , int $rows [, bool $bestfit = false ] )

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。

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

columns: The number of columns in the scaled image.
rows: The number of rows in the scaled image.
bestfit: Whether to fit the image inside a bounding box.

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.
2.1.0	This method now supports proportional scaling. Pass zero as either parameter for proportional scaling.

范例

Example #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

Imagick::chopImage() - Removes a region of an image and trims
Imagick::cropImage() - 截图图片的一块区域
Imagick::magnifyImage() - Scales an image proportionally 2x
Imagick::minifyImage() - Scales an image proportionally to half its size
Imagick::resizeImage() - Scales an image
Imagick::scaleImage() - Scales the size of an image
Imagick::shaveImage() - Shaves pixels from the image edges
Imagick::thumbnailImage() - Changes the size of an image
Imagick::trimImage() - Remove edges from the image