Imagick::levelImage
(No version information available, might be only in CVS)
Imagick::levelImage — Adjusts the levels of an image
说明
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Adjusts the levels of an image by scaling the colors falling between specified white and black points to the full available quantum range. The parameters provided represent the black, mid, and white points. The black point specifies the darkest color in the image. Colors darker than the black point are set to zero. Mid point specifies a gamma correction to apply to the image. White point specifies the lightest color in the image. Colors brighter than the white point are set to the maximum quantum value.
å‚æ•°
- blackPoint
-
- gamma
-
- whitePoint
-
- channel
-
返回值
Returns TRUE on success.