Thanks Jerry ---
I ended up using...
float[][] matrix = { {1.0f }, {1.0f}, {1.0f}, {1.0f}};
RasterOp combineOp = new BandCombineOp(matrix,null);
combineOp.filter(original.getAlphaRaster(), newImage.getRaster());
I haven't figured out the whole ColorModel/SampleModel/Raster scheme yet but I've got
my solution for now.
--- Ted
-----Original Message-----
From: Jerry Evans [SMTP:[EMAIL PROTECTED]]
Sent: Thursday, April 06, 2000 7:51 PM
To: [EMAIL PROTECTED]
Subject: Re: [JAVA2D] Thanks on Embossing, etc..now I'm diving into ColorModels
'cause...
> ...I need to take an RGB w/alpha image and create a Black and White mask
> corresponding to the alpha and non-alpha pixels.
>
> For this case, lets say any pixel with alpha == 0.0f is black and
> 0.0f < alpha <= 1.0f.
Do you mean that 0.0f < alpha <= 1.0f is white?
If so, one way to do it would be to get a subraster from the RGBA image
which is just the alpha channel. Then create a BufferedImage using this
raster and an IndexedColorModel that maps 0 to black and everything else
to white. Then draw this BufferedImage to a new BufferedImage of
TYPE_BYTE_BINARY or TYPE_BYTE_GRAY to create a 1-bit or 8-bit mask image.
Jerry
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