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Date: Wed, 22 Mar 2000 14:00:50 -0500
To: "Michael O'Rourke" <morourke@adobe.com>, <tiff@olympiakos.com>
From: James Palo <palo@snowbnd.com>
Subject: Re: Question about strips
In-Reply-To: <NDBBIGKGONPMFGOBBGCOAEBJCGAA.morourke@adobe.com>
References: <NDBBIGKGONPMFGOBBGCOIEBFCGAA.morourke@adobe.com>
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You cannot just combine each G4 strip.  Each strip starts with a new white 
reference line.  G4 is based on comparing the last line decompressed.  When 
decompressing the first line of each strip a reference white line of length 
width is used so the G4 would break up after the last line of the first strip.

                                         Jim Palo


At 10:18 AM 3/22/00 -0600, Michael O'Rourke wrote:

>  Would it be correct to say that if an image is CCITT G4
>  compressed and has multiple strips, then each strip is compressed
>  individually and it is impossible to just take those compressed
>  strips and combine them into one G4 compressed stream without
>  uncompressing and recompressing?
>
>  Michael



Best regards

Jim Palo   <palo@snowbnd.com>

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