PHP | imageantialias() Function

The imageantialias() function is an inbuilt function in PHP which is used to check whether antialias function is used or not. This function activate the fast drawing anti-aliased methods for lines and wired polygons. It works only with truecolor images.

Syntax:

bool imageantialias( $image, $enabled )

Parameters: This function accepts two parameters as mentioned above and described below:

  • $image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
  • $enabled: This parameter is used to check whether enable antialiasing or not.

Return Value: This function returns True on success or False on failure.

Note: The imageantialias() function is now available. It was only available if PHP was compiled against version of the GD library.



Below program illustrates the imageantialias() function.

Program 1:

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<?php
   
// Function to create image of given size
$antialias_img = imagecreatetruecolor(800, 200);
$normal_img = imagecreatetruecolor(400, 200);
   
// Switch antialiasing on for one image
imageantialias($antialias_img, true);
   
// Allocate the color for image
$white = imagecolorallocate($normal_img, 255, 255, 255);
$white_anti_aliased = imagecolorallocate($antialias_img, 255, 255, 255);
   
// Draw two lines, one with antialiasing enabled
imageline($normal_img, 0, 0, 400, 200, $white);
imageline($antialias_img, 0, 0, 400, 200, $white_anti_aliased);
   
// Merge the two images side by side for output
imagecopymerge($antialias_img, $normal_img, 400, 0, 0, 0, 400, 200, 200);
   
// Output image
header('Content-type: image/png');
   
imagepng($antialias_img);
imagedestroy($antialias_img);
imagedestroy($normal_img_img);
?>

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Output:

Reference: http://php.net/manual/en/function.imageantialias.php

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