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

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. 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?

Many thanks!
Andrew

On 3/17/07, Pierre <[email protected]> wrote:
>
> On 3/17/07, Andrei Stebakov <[email protected]> wrote:
> > Gives me this resut:
> > http://www.greenpixeldesign.com/cphandler/tmp-img/test.png
> >
> > I am using libgd 2.0.33 on debian, so basically I just create an image
> from
> > scratch, set transparent color to black and use gdImageStringFT to draw
> to
> > text. (I use lisp bindings to do that). What am I missing to remove the
> > black outline from the text?
>
> The antialiasing is not 100% black, it does not match the transparent
> color (or index). That's why they remain and appears ugly in anything
> but a black background. If you want a white background, I suggest to
> use it in your image as transparent color.
>
> 2.1.0 will support antialiasing using the alpha channel only when the
> covered area is transparent. It will solve the problem as long as your
> browser supports transparency/opacity in the png image (IE does not).
>
> --Pierre
>