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August 2007
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2007.08.28 18:27 "Re: Bits/sample must be 1 for Group 3/4 encoding/decoding", by Paul Smith
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... Thanks, Toby. Yes, my file is fully black and white. I am going to have a look at NetPBM. Paul