Imagick::contrastImage

(PECL imagick 2.0.0)

Imagick::contrastImage — Change the contrast of the image

说明

bool Imagick::contrastImage ( bool $sharpen )

Enhances the intensity differences between the lighter and darker elements of the image. Set sharpen to a value other than 0 to increase the image contrast otherwise the contrast is reduced.

参数

sharpen: The sharpen value

返回值

成功时返回 TRUE。

错误／异常

错误时抛出 ImagickException。