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Reading TIFF file (low level)

Does anyone how any clue on how to read a TIFF file directly in a
filestream?
I know I can load the complete image into memory, but since this a 800+ mb
image, I usually get a "Out of memory" error.
Basically, all I have to do, is look up some certain pixel-values, so I
would guess that its just a matter of seeking to the correct bytes and parse
them to a color.

Can anyone give me some pointers on how to calculate the correct position in
the file, where I can get a certain pixel-value?
I'm complete off on this one, so any ideas would do (except the approach of
splitting the image up in several smaller images).

Regards
/Morten Nielsen
Nov 16 '05 #1
2 5118
There's a link to the pdf for the TIFF specification from this site:
http://whatis.techtarget.com/definit...214180,00.html
--
Mike Mayer, C# MVP
mi**@mag37.com
http://www.mag37.com/csharp/
"Morten Nielsen" <sp**@iter.dk> wrote in message
news:c5**********@news.net.uni-c.dk...
Does anyone how any clue on how to read a TIFF file directly in a
filestream?
I know I can load the complete image into memory, but since this a 800+ mb
image, I usually get a "Out of memory" error.
Basically, all I have to do, is look up some certain pixel-values, so I
would guess that its just a matter of seeking to the correct bytes and parse them to a color.

Can anyone give me some pointers on how to calculate the correct position in the file, where I can get a certain pixel-value?
I'm complete off on this one, so any ideas would do (except the approach of splitting the image up in several smaller images).

Regards
/Morten Nielsen

Nov 16 '05 #2
There's a link to the pdf for the TIFF specification from this site:
http://whatis.techtarget.com/definit...214180,00.html
--
Mike Mayer, C# MVP
mi**@mag37.com
http://www.mag37.com/csharp/
"Morten Nielsen" <sp**@iter.dk> wrote in message
news:c5**********@news.net.uni-c.dk...
Does anyone how any clue on how to read a TIFF file directly in a
filestream?
I know I can load the complete image into memory, but since this a 800+ mb
image, I usually get a "Out of memory" error.
Basically, all I have to do, is look up some certain pixel-values, so I
would guess that its just a matter of seeking to the correct bytes and parse them to a color.

Can anyone give me some pointers on how to calculate the correct position in the file, where I can get a certain pixel-value?
I'm complete off on this one, so any ideas would do (except the approach of splitting the image up in several smaller images).

Regards
/Morten Nielsen

Nov 16 '05 #3

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