Pixel colorvalue in an Image

[Peter the Swede]

Best groupmember,

I'm working with my thesis in Physics and are doing some programming in
Java. I have a map (gif-image) that for a specific pixel I need to find out
what RGB-value it has. I will further use it for classification, but that is
of no importance here.

I have the picture as an Image object:

Image myImage = Toolkit.getDefaultToolkit().getImage(URL);

Can I from my Image-object get the information that I need. Anyone that at
least can give me an hint where to go to solve the problem.

I would appreciate any answer.

 

[ak]

a) use PixelGrabber or
b) create BufferedImage instead of Image

 

[Marco Schmidt]

Peter the Swede:

I'm working with my thesis in Physics and are doing some programming in
Java. I have a map (gif-image) that for a specific pixel I need to find out
what RGB-value it has. I will further use it for classification, but that is
of no importance here.

Instead of getImage use ImageIO.read. This will give you a
BufferedImage object (that class extends Image) which has a getRGB
method. This will give you an int value, from which the three values
for red, green and blue can be decoded like this:
<http://www.geocities.com/marcoschmidt.geo/java-image-faq.html#rgba>.

Alternatively you can use the PixelGrabber class.

And yes, this is all way too complicated for a simple task like "get
color of pixel". :/

[...]

Regards,
Marco

 

[Peter the Swede]

Thank you Marco, it solved my problem. Cheers!

Peter the Swede:

I'm working with my thesis in Physics and are doing some programming in
Java. I have a map (gif-image) that for a specific pixel I need to find out
what RGB-value it has. I will further use it for classification, but that is
of no importance here.

Instead of getImage use ImageIO.read. This will give you a
BufferedImage object (that class extends Image) which has a getRGB
method. This will give you an int value, from which the three values
for red, green and blue can be decoded like this:
<http://www.geocities.com/marcoschmidt.geo/java-image-faq.html#rgba>.

Alternatively you can use the PixelGrabber class.

And yes, this is all way too complicated for a simple task like "get
color of pixel". :/

[...]

Regards,
Marco