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2007.08.28 17:12 "Re: Bits/sample must be 1 for Group 3/4 encoding/decoding", by Toby Thain
On 28-Aug-07, at 1:50 PM, Paul Smith wrote: > On 8/28/07, Toby Thain <toby@smartgames.ca> wrote: >>> When trying to convert from ppm to tiff, I get th following error: >>> >>> $ ppm2tiff -c g4 pag-160.ppm lixo.tif >>> lixo.tif: Bits/sample must be 1 for Group 3/4 encoding/decoding. >>> $ >>> >>> Any ideas? >> >> A PPM is typically RGB, IIRC; try making sure it's 1-bit data first >> (PBM). > > Thanks, Toby. The PPM that I get is from pdfimages, although the > document is black and white. Is there some way of getting PBM from > pdfimages? Or, alternatively, is there some way of converting from PPM > to PBM without loosing resolution? Hi Paul, I assume you've looked at the file and it's a black and white bitmap? In which case, you certainly can convert without losing any important information (or resolution). Look into the NetPBM tools, or GraphicsMagick... --Toby > > Paul > _______________________________________________ > Tiff mailing list: Tiff@lists.maptools.org > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/