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February 2005

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2005.02.02 09:56 "Tiff differences", by <duarte_costa@clix.pt>
2005.02.02 15:35 "Re: Tiff differences", by Bob Friesenhahn
2005.02.02 15:43 "Re: Tiff differences", by Andy Cave
2005.02.02 17:37 "Re: Tiff differences", by Ed Grissom

2005.02.02 15:35 "Re: Tiff differences", by Bob Friesenhahn

> Detected main differences are related to strips. I think that Tiff 1 
> has more strips then Tiff 2. In this case, i think that Tiff2 is 
> much more heavy (i am using 2Gb memory)

Tiff 2 is using one huge strip.  It seems that the TIFF reader is 
"broken" in that it is trying to read the entire strip (263469312 
bytes) into memory at once.  At least with libtiff, there is the 
opportunity to use scanline style access with this tiff in order to 
minimize memory consumption.

> Any feedback is welcomed in detecting differences that can cause 
> this issues, as well as the best way to make tiff2 similar to tiff 
> 1.

Use tiffcp to break the problem tiff into one with small strips, or 
fix the tiff reader to use scanline access when it should.

Bob
======================================
Bob Friesenhahn
bfriesen@simple.dallas.tx.us
http://www.simplesystems.org/users/bfriesen