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Re: Best way to get RGB values?

Or maybe make a BufferedImage in Java2+, and use a
QTImageProducer to draw your QT graphics into the
BufferedImage, then use any standard Java2 techniques to get
the data (e.g. when instantiating the BufferedImage tell it
to wrap some int array of yours etc.)

>
> > The code went on to do it's thing and I get the idea of
what happened.
> > However, it seems that once you get the array of pixels,
you should be
> > able to do a variety of things. I looked in
java.awt.image.* and
> > found ColorModel, which describes getBlue(), getRed(),
getGreen(),
> > which seem useful, but ColorModel is declared abstract
and in typical
> > fashion when you need something simple, there look to be
about 10
> > subclasses and sub-subclasses.
> >
> > I didn't see anything comparable in the QTJ API docs but
I have to
> > believe that I just missed it. Also, looked on the ADC
site for info
> > but that didn't turn up much. Any help would be
appreciated. Thanks.
>
>
> the PixMap can tell you (a) how big each pixel is
(getPixelSize) and
> what format the pixel data is (getPixelFormat).
>
> you can save yourself time by allocating the original
GWorld (aka
> QDGraphics) yourself, and then you already know the pixel
format. Make
> sure you allocate the GWorld _offscreen_ and that way you
can be sure
> what you (dont) see is what you get - onscreen display has
tricks in as
> much as some kinds of video will display straight to the
hardware.
>
> (I'd look up a pixel format docs for you, you'll have to
do it yourself
> - Apple's gone of line for some reason)
>
> anyway, for example for an ARGB32 pixel format, you do
>
> int pixel = raw.getInt(0); // get pixel from raw image,
make sure you
> use rowbytes
>
> int a = (pixel >>> 24) & 0xFF;
> int r = (pixel >>> 16) & 0xFF;
> int g = (pixel >>> 8) & 0xFF;
> int b = (pixel >>> 0) & 0xFF; // optimize away ...
>
> this arrangement changes for each different kind of pixel
format, and
> this is what the AWT image stuff tries to abstract away...
but like I
> said - allocate your own *known* pixel format and you can
get away with
> it.
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