php-gdBetter antialias with GD

This is rather a hack, than systematic solution, so mind using other libs like Imagemagick for PHP to get native antialiasing support.

<?php

$im = imagecreatetruecolor(4000, 3000);
imageantialias($im, true);

$c_black = imageColorAllocate($im, 0,0,0);
$c_green = imageColorAllocate($im, 46,204,64);

imagefilledellipse($im, 2000, 1500, 800, 800, $c_green);

$imf = imagecreatetruecolor(400, 300);
imagecopyresampled($imf, $im, 0,0,0,0, 400,300,4000,3000);

imagePng($imf, '/tmp/image.png');ctrl + cgithub

`imagecreatetruecolor` creates true color GD image object with specified width & height	`imageantialias` enable antialiasing for the given image
`imageColorAllocate` creates color object to later use in image	`imagefilledellipse` creates ellipse with specified coordinates, radius and color
`4000, 3000` we have created initial image of large size (10x what we need in result)	`imagecopyresampled` now we resize source large image (`4000x3000`) to resulting image (`400x300`) to apply better antialiasing
`imagePng` saves image in PNG format to the given path

Usage example

<?php

$im = imagecreatetruecolor(4000, 3000);
imageantialias($im, true);

$c_black = imageColorAllocate($im, 0,0,0);
$c_green = imageColorAllocate($im, 46,204,64);

imagefilledellipse($im, 2000, 1500, 800, 800, $c_green);

$imf = imagecreatetruecolor(400, 300);
imagecopyresampled($imf, $im, 0,0,0,0, 400,300,4000,3000);

imagePng($imf, '/tmp/image.png');

Using antialias in GD

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php-gdBetter antialias with GD

Usage example

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