php Imagick::levelImage usage

Question

I have trying hard, but can\'t make this method works properly.
The usage format is

Imagick::levelImage ( float $blackPoint , float $gamma , float $whi         


        

Answer 1

Looking at the ImageMagick documentation for LevelImage:

Specify the levels where the black and white points have the range of 0-QuantumRange, and gamma has the range 0-10

So a sensible call from PHP might look like this:

//bool Imagick::levelImage ( float $blackPoint , float $gamma , float $whitePoint [, int $channel = Imagick::CHANNEL_ALL ] )
$img->levelImage (20, 5, 220);

I'm guessing the QuantumRange is set at 255, if not, try calling Imagick::getQuantumRange to find out what it is.

If it still doesn't seem to work, I'll figure out what's wrong by writing example code.