On Wed, 16 Jan 2008 12:38:29 +0200
"Alexandru Cabuz" <[EMAIL PROTECTED]> wrote:

> Hello,
> I have some tiff files which I want to convert to djvu using the
> bitonal encoder of djvulibre. However, my tiff files are nominally
> color, even though they just contain B&W text.
> How can I transform these files to be bitonal?

Have a look at http://freshmeat.net/projects/image-density/

> Also, is there a way to batch this job?

If the above is what you want, then it should be possible to do a batch job

You also might want to look at ImageMagick, look at threshold

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