Re: [GD-DEVEL] Newbie transparent gif question- possibly solved.

On Fri, 2008-05-02 at 14:57 +0200, Pierre Joye wrote:
> On Fri, May 2, 2008 at 2:31 PM, Roger Oberholtzer <[email protected]> wrote:
> 
> >  Thanks! Be sure to do one where you Allocate a color more than once, and
> >  set the transparency to one after the first Allocate of the color.
> 
> 
> Do you understand what I mean by:
> 
> It uses only the color index with palette images.

I do indeed understand the concept. All I can say is that something
makes this not work as expected. I suspect it is that I am using the
code in a way other that you expect. But, from what I can tell, not in
contradiction to the documentation.

What would happen if I read in the image again into GD? Does the index
get set properly upon read?

I will see if I can pare down my code into the minimal that makes this
happen. Or not happen, as the case may be.

> 
> ?
> 
> 
> im = gdImageCreate(100,100);
> for (i=0; I<256;i++) {
>   a[i] = gdImageColorAllocate(im, 255,0,0);
> }
> 
> gdImageColorTransparent(im, 23);
> 
> That will tell GD to use the index number 23 as transparent color. The
> index is what is stored in the image, and not the color values. It
> does not matter if the 254 other indexes have the exact same value.
> 
> Cheers,
> -- 
> Pierre
> http://blog.thepimp.net | http://www.libgd.org
> 
-- 
Roger Oberholtzer

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