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