Converting to grayscale?

Hi,
I'm doing an experiment and as preprocessing would like to convert my set of PNG images into grayscale using the following ratios
New pixel value = .31R + .59G + .10B
While I'm experienced in Java and server side apps, I've never done much client work. The vast area of java.awt.image classes are at the moment a bit inaccessible.
Can someone recommend the current (1.4) way of doing this? I'd really like to use my grayscale ratio rather than the default grayscale ColorSpace (though it'd be nice to know what ratios it uses, too).
Any tutorials/books/links would be appreciated, too! Thanks!
- Everett

...just to note, the paper that I'm implementing for a class project says the following on its conversion:
"In the preprocessing stage each COIL image I = (R, G, B)
was first transformed into a gray-level image E through the
conversion formula
E = .31R + .59G + .10B,
rescaling the obtained gray-level in the range between
zero and 255."
"Support Vector Machines for 3D Object Recognition"
Pontil & Verri, 1998
I'd be happy to also know how in 1.4 to convert to grayscale in general! :)
Thanks,
Everett

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