Imagick::levelImage
(No version information available, might be only in CVS)
Imagick::levelImage — Adjusts the levels of an image
說明
bool Imagick::levelImage
( float $blackPoint
, float $gamma
, float $whitePoint
[, int $channel
] )
Warning
此函式目前沒有參考文件；只有引數列表。
Warning
本函式是實驗性的。這個函式的行為、名稱、和關於此函式的任何其他文件在未來PHP的發行中可能會在不通知的情況下改變。 使用此函式需自行承擔風險。
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.
參數
- blackPoint
-
- gamma
-
- whitePoint
-
- channel
-
Return值
Returns TRUE on success.