Re: [GD-DEVEL] trasparent image width antialiasing

----- Original Message ----- 
From: "Pierre" <[email protected]>
To: "yagyog" <[email protected]>
Cc: <[email protected]>
Sent: Thursday, February 01, 2007 1:17 PM
Subject: Re: [GD-DEVEL] trasparent image width antialiasing


> On 2/1/07, yagyog <[email protected]> wrote:
>> ----- Original Message -----
>> From: "Pierre" <[email protected]>
>> To: "yagyog" <[email protected]>
>> Cc: <[email protected]>
>> Sent: Thursday, February 01, 2007 12:35 PM
>> Subject: Re: [GD-DEVEL] trasparent image width antialiasing
>>
>>
>> > Hi,
>> >
>> > On 1/30/07, yagyog <[email protected]> wrote:
>> >> ----- Original Message -----
>> >> From: "Pierre" <[email protected]>
>> >> To: "yagyog" <[email protected]>
>> >> Cc: <[email protected]>
>> >> Sent: Tuesday, January 30, 2007 3:48 PM
>> >> Subject: Re: [GD-DEVEL] trasparent image width antialiasing
>> >>
>> >>
>> >> > On 1/30/07, yagyog <[email protected]> wrote:
>> >> >> I have a problem, Excused but I do not speak English
>> >> >>
>> >> >>
>> >> >> I have in input one image png with antialising
>> >> >> with uniform solid background
>> >> >>
>> >> >> I would want
>> >> >>
>> >> >> 1) to eliminate the background
>> >> >> 2) recreate the channel alpha in order not to lose the antialising 
>> >> >> on
>> >> >> the
>> >> >> text
>> >> >>
>> >> >> It is possible?
>> >> >> you can give me of the information ?
>> >> >>
>> >> >> I try this code but not work:
>> >> >>
>> >> >> //
>> >> >> //load a, load b  and create test
>> >> >> //
>> >> >> a = myLoadPng("a.png");
>> >> >> b = myLoadPng("b.png");
>> >> >
>> >> > Can you give us a link to the images a.png and b.png please?
>> >> >
>> >> > --Pierre
>> >> >
>> >> Yes
>> >> the color is changed but ,
>> >> it does not change nothing
>> >>
>> >> http://www.yag.altervista.org/varius/a.png
>> >> http://www.yag.altervista.org/varius/b.png
>> >> my result
>> >> http://www.yag.altervista.org/varius/test.png
>> >
>> > You have to use the alpha component in your image. So the blending
>> > will be done when you copy a or b over test
>>
>> >. But if the original  images do not contain any alpha components
>> Exact! :(
>>
>> , the anti aliasing being
>> > done against a given color (green and yellow in your case), you will
>> > have a visible aliasing.
>> >
>> Excuse I have not understood well
>> you could makes to understand me better. even with of the code
>
> There is no way to achieve what you want without using the alpha
> component in your images.
>
> Here is an example image: 
> http://blog.thepimp.net/misc/test_text_aa_alpha.png
>
> Load it in gimp/gqview, you will see the alpha values in the edges.
>
therefore

I cannot realize what I said with one image without channel alpha? solution 
does not exist one practically

And if I have one image with the channel alpha?