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Re: Anti-aliasing in imag

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  Re: Anti-aliasing in imag "Daniele Futtorovic" <daniele.futtorovic@THRWHITE.remove-dii-this> - 2011-04-27 15:48 +0000

#3994 — Re: Anti-aliasing in imag

  To: comp.lang.java.gui
On 15/08/2008 02:03, Knute Johnson allegedly wrote:
> Daniele Futtorovic wrote:
>> On 14/08/2008 17:20, Knute Johnson allegedly wrote:
>>> Well there's a truth that it took me a while to learn and that is 
>>> that you can't draw alpha into an image.
>>
>> Must be jolly interesting if it's something that took you a while to
>> learn. So... what does that sentence mean?
>>
> 
> If you have an image, you basically can't draw on it (with the usual 
> Graphics(2D) methods) and reduce the alpha value of the pixels in the 
> image.  Say you have a pixel that is white with an alpha of 255.  There 
> is no way to draw on the image to change that pixel's alpha to another 
> value.  

I thought that was what the AlphaComposites were for...

> Unless of course you use an AlphaComposite with a value of 
> Clear.  That will change it to a black pixel with an alpha of 0.

... ah.

To get this right, are you positively sure there is no way? Not even 
playing with XOR paint?

-- 
DF.

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