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  How to determine what color is on a certain pixel?  (Read 933 times)
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Offline Danskeren

Senior Member


Projects: 1


oi?


« Posted 2005-10-16 21:00:38 »

Is there a way to get the color that is on a certain pixel of an Image using the Graphics objet or Image (/BufferedImage) object itself?

Offline Usul

Senior Newbie




I hunt bugs


« Reply #1 - Posted 2005-10-16 21:32:05 »

Yes, by using BufferedImage.

Thats how u do it:

1)  get a Graphics2D object:  g2d  = yourBufferedImage.createGraphics();
2)  draw your image on the BufferedImage
3)  get the color of a pixel:  int colorCandidate = yourBufferedImage.getRGB(x,y);

It's times like this that I wish I'd listened to what my dad used to tell me.
Yeah? What was that?
I don't know. I never listened. 
- Dr. Venkman and Mr. Zeddemore
Offline Danskeren

Senior Member


Projects: 1


oi?


« Reply #2 - Posted 2005-10-16 21:45:12 »

How do I convert the colorCandidate into a Color-object?

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Offline tom
« Reply #3 - Posted 2005-10-16 21:59:56 »

1  
Color color = new Color(colorCandidate)

Offline mudman

Junior Member




Here we go again...


« Reply #4 - Posted 2005-10-17 09:48:04 »

If your image contains alpha-pixels they will blend with your BufferedImage when you draw it to it.
To copy the pixels without blending set the alpha composite of the BufferedImage's Graphics object to SRC:
1  
g2d.setComposite(AlphaComposite.Src);


      
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