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How to turn anti-alias off when using rasterizer: msg#00216

Subject: How to turn anti-alias off when using rasterizer
Is it possible to turn anti-aliasing off when using the Batik SVG
rasterizer to convert SVG to PNG?

If yes, how can I turn anti-aliasing off.

If no, does anyone know a way (preferably at the unix command line) to
change all non-white pixels in a raster image to black.

More details:
 - Attached is a portion of a PNG generated by the Batik rasterizer.
 - Via shellscript I am feeding PNGs into a tracing tool that generates
a nice beizer curve SVG of the solid regions.
 - The tool is not recognizing Monaco (the three pixels on the left)
because it is not solid black.
 - Hence I want to turn anti-aliasing off.

Regards,
Rob

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