I've searched and searched and I cannot find an answer to this...

I'm trying to make an image using GD that has a transparent background and anti-aliased text in it. Unfortunately, this seems completely impossible but I'm sure I'm totally missing something.

I'm new to GD, so I hope I'm just missing something really simple.

Here's examples:
http://www.xbg4y.com/test.html

The top one is imagefill white with black text.
The bottom one is imagefill white, imagecolortransparent white, and then black text.

In an attempt to anti-alias, it does it as if it were still on the white background instead of anti-aliasing into transparency. I know you can turn off anti-aliasing, but then there would be no point in using GD to begin with...

Any ideas...? Is there something fancy you can do with alpha channels?

PHP Code:

<?php
header('content-type: image/png');
$im = imagecreatetruecolor(800,600);

// Important stuff
// Allocate a transparent background color
$bg = imagecolorallocatealpha($im,255,0,0,127);
// ..and a non-transparent text color
$text = imagecolorallocate($im,0,0,0);
// Turn on full alpha channel saving for PNG images
imagesavealpha($im,true);

// Fill with transparent and text with the other
imagefill($im,0,0,$bg);
imagettftext($im,40,0,50,50,$text,'C:\Windows\Fonts\arial.ttf','S58G');

imagepng($im);
?>

Thanks a lot, that works perfectly.

really good code but i have try to avoid the distortion in text ,esp in outer side of each text ,for example the letter "U" the curved portion look like
Pixelation ,do you have any idea to avoid the same ,if so please let me know
thank you
image link :http://suzerain.isgreat.org/pixlise.JPG
please cut and copy the url don't click
Best regards,
Sujith

Originally Posted by Insensus

PHP Code:

<?php
header('content-type: image/png');
$im = imagecreatetruecolor(800,600);

// Important stuff
// Allocate a transparent background color
$bg = imagecolorallocatealpha($im,255,0,0,127);
// ..and a non-transparent text color
$text = imagecolorallocate($im,0,0,0);
// Turn on full alpha channel saving for PNG images
imagesavealpha($im,true);

// Fill with transparent and text with the other
imagefill($im,0,0,$bg);
imagettftext($im,40,0,50,50,$text,'C:\Windows\Fonts\arial.ttf','S58G');

imagepng($im);
?>