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PHP | Gmagick gammaimage() Function
  • Last Updated : 18 Nov, 2019

The Gmagick::gammaimage() function is an inbuilt function in PHP which is used to corrects the image by providing the Gamma-correction. The view of the same images is different on the different devices. In this way, the image intensities are represented on the screen.

Syntax:

Gmagick Gmagick::gammaimage( $gamma )

 
Parameters: This function accepts a single parameters $gamma which holds the value of gamma-correction.

Return Value: This function returns gamma corrected Gmagick object.

Errors/Exceptions: This function throws GmagickException on error.



Below programs illustrate the Gmagick::gammaimage() function in PHP:

Program 1:
Original Image:




<?php 
    
// Create a Gmagick object 
$gmagick = new Gmagick(
    
// Use gammaimage() function 
$gmagick->gammaimage(5);
  
header('Content-type: image/png'); 
    
// Output the image 
echo $gmagick
?> 

Output:

Program 2:




<?php 
     
// Create a GmagickDraw object 
$draw = new GmagickDraw(); 
    
// Create GmagickPixel object 
$strokeColor = new GmagickPixel('Red'); 
$fillColor = new GmagickPixel('Green'); 
    
// Set the color, opacity of image 
$draw->setStrokeOpacity(1); 
$draw->setStrokeColor('Red'); 
$draw->setFillColor('Green'); 
    
// Set the width and height of image 
$draw->setStrokeWidth(7); 
$draw->setFontSize(72); 
     
// Function to draw circle  
$draw->circle(250, 250, 100, 150); 
   
$gmagick = new Gmagick(); 
$gmagick->newImage(500, 500, 'White'); 
$gmagick->setImageFormat("png"); 
$gmagick->drawImage($draw); 
    
// Use gammaimage() function 
$gmagick->gammaimage(10);
  
// Display the output image 
header("Content-Type: image/png"); 
echo $gmagick->getImageBlob(); 
?> 

Output:

Reference: http://php.net/manual/en/gmagick.gammaimage.php

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