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August 2005

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2005.08.15 01:14 "Re: Question on TIFF images with large stripbytecounts", by Katrina Maramba

Does anybody else have an idea on these?
 
I would need to know the following:
        *  what should the size of the strip be to be considered for this
        strip-chopping process?
        *  what is the maximum size of the individual "chopped" strip?
              Bob mentioned of a default libtiff strip size.  Anybody got an
              idea on the exact figure of the default?
        *  For compressed files, the minimum strip size likely depends on
        compression type and parameters.  Can anyone expound on this?
 
 
Any comments would be appreciated.  Thanks in advance.

 
 

Bob Friesenhahn <bfriesen@simple.dallas.tx.us> wrote:
Date: Wed, 3 Aug 2005 13:55:15 -0500 (CDT)
From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
To: katrina maramba <ka3na_423@yahoo.com>
CC: tiff mail <tiff@remotesensing.org>
Subject: Re: Question on TIFF images with large stripbytecounts

On Tue, 2 Aug 2005, katrina maramba wrote:
>
> Libtiff does include a "strip chopping" feature in which it produces
> many smaller strips if possible. This feature can be disabled via a
> library compilation option.
>
> Good day Bob,
>
> In this strip-chopping feature you mentioned to me before, do you 
> know of any accurate and specific process/ figure on how libtiff 
> does this? Like what should the size of the strip be to be 
> considered for this strip-chopping process? And what is the maximum 
> size of the individual "chopped" strip? Memory estimation and 
> management is very important in my project, thats why I need these 
> details. Thanks in advance.

No, I do not. For uncompressed files, strips can easily be generated 
at any size and I assume that they use (or are close to) the default 
libtiff strip size. For compressed files, the minimum strip size 
likely depends on compression type and parameters. Even then, libtiff 
could emulate smaller strips by allocating its own memory (not what 
you wanted to hear!).