imagick_level
(PECL)
imagick_level -- Adjust levels of a particular image channel by scaling the colors falling between specified white and black points to the full available quantum range
说明
bool
imagick_level ( resource image, string level )
参数
image
Image handle
level
Specify the levels where the black and white points have the range of
0-QuantumRange, and gamma has the range 0-10 (e.g. 10x90+2)
返回值
如果成功则返回 TRUE，失败则返回 FALSE。