Re: [GD-DEVEL] Drawing anti-aliased text with transparent background

Hi Andrei,

On 3/17/07, Andrei Stebakov <[email protected]> wrote:
> Pierre, I need to create a png image with a transparent background so that
> when I put this image on top of any other image of _any_ color only the text
> will show.

Yes, I understood that. That's why I added the comment about alpha
based antialiasing. That's what photoshop or gimp do.

> The text outline should look smooth without any fringes. I know
> when I create a transparent PNG in any graphic program like Photoshop I
> don't have to pick an anti-aliased color. AFIK, only gif needs a particular
> color for anti-aliasing.
> Could you please, enlighten me what we are missing in GD (how it works) and
> if I can get the result that we are talking about?

Check the list archive, I remember a script to convert the antialias
to alpha. The idea is to draw a text using white on a temporary image.
Then you can convert the white levels to alpha while copying the
temporary image to the final image. I can create a C or PHP example to
do it if you like later tonight :).

--Pierre