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PHP Imagick sigmoidalContrastImage () function

bool Imagick::sigmoidalContrastImage (bool $sharpen, float  $alpha, float $beta, int $channel = Imagick::CHANNEL_DEFAULT)
Parameters:this function takes four options as above and described below:
  • $sharpen:specifies whether to increase or decrease the contrast. A true value increases contrast, and a false value decreases contrast.
  • $alpha:determines the level of contrast to be applied.
  • $beta: specifies the midpoint of the gradient.
  • $channel:This is an optional parameter that contains a channel constant. The default is Imagick::CHANNEL_DEFAULT.
Return Value:This function returns TRUE on success.Exceptions:this function throws an ImagickException on error.The following programs illustrate the Imagick::sigmoidalContrastImage()function in PHP:Program 1 :  
// Create a new imagick object $imagick = new Imagick ( -content / uploads / engineerfor engineer-13.png );  
// Adjust contrast $imagick -> sigmoidalContrastImage (true, 10, 32000);  
// Show output header ( "Content-Type: image / png" ); echo $imagick -> getImageBlob(); ?>
Output: Program 2:  
// Create new imagick object $imagick = new Imagick ( );  
// Adjust contrast $imagick -> sigmoidalContrastImage (false, 10, 31000);  
// Show output header ( "Content-Type: image / png" ); echo $imagick -> getImageBlob(); ?>
Output: Link:


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