Php/docs/function.imagescale

• PHP Manual
• GD 和图像处理 函数
• Scale an image using the given new width and height

imagescale

(PHP 5 >= 5.5.0, PHP 7)

imagescale — Scale an image using the given new width and height

说明

imagescale ( resource $image , int $new_width [, int $new_height = -1 [, int $mode = IMG_BILINEAR_FIXED ]] ) : resource|false

imagescale() scales an image using the given interpolation algorithm.

Note:

Unlike many of other image functions, imagescale() does not modify the passed image; instead, a new image is returned.

参数

image

由图象创建函数(例如imagecreatetruecolor())返回的图象资源。

new_width

The width to scale the image to.

new_height

The height to scale the image to. If omitted or negative, the aspect ratio will be preserved.

mode

One of IMG_NEAREST_NEIGHBOUR, IMG_BILINEAR_FIXED, IMG_BICUBIC, IMG_BICUBIC_FIXED or anything else (will use two pass).

Note:

IMG_WEIGHTED4 is not yet supported.

返回值

Return the scaled image resource on success 或者在失败时返回 false.

参见

• imagecopyresized() - 拷贝部分图像并调整大小
• imagecopyresampled() - 重采样拷贝部分图像并调整大小