Image Antialias with php-gd on ubuntu 10.04

Posted on 2011-11-07 11:23:00
by Geert Vandeweyer

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Image Antialias with php-gd on ubuntu 10.04

Posted on 2011-11-07 11:23:00
by Geert Vandeweyer

After moving a webserver from a good old and non-flexible sles10 server to Ubuntu 10.04 LTS, I noticed that some PHP generated charts were not showing up, complaining about a missing Anti-alias function. It seems that Ubuntu refuses to used the bundled GD library in the newer PHP versions, and php-gd in aptitude is missing some functions. Hence, we have a problem. 

As a workaround I added a simple check in my image scripts, to make sure that anti-alias is not called if the function does not exist. I tend to include this in all my images now. 

// example snippet from a jpgraph picture

if (function_exists('imageantialias')) {
	$graph->img->SetAntiAliasing();
}

// example from a plain image 

if (function_exists('imageantialias')) {
	imageantialias($image,true);
}

However, there is a way to enable antialias on ubuntu whithout recompiling everything. Thanks to Maxiwebs there are now replacement debs for php-gd, containing the bundled version. See their site for instructions. 

antialias, Image, PHP, Ubuntu