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From: Toby Thain <toby@smartgames.ca>
Subject: Re: [Tiff] Bits/sample must be 1 for Group 3/4 encoding/decoding
Date: Tue, 28 Aug 2007 13:22:28 -0300
To: "Paul Smith" <phhs80@gmail.com>
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On 28-Aug-07, at 12:47 PM, Paul Smith wrote:

> Dear All,
>
>
> 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).

--Toby

>
> Thanks in advance,
>
> Paul
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