LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
March 2008
Previous Thread
Next Thread
Previous by Thread
Next by Thread
Previous by Date
Next by Date
Contact
The TIFF Mailing List Homepage
This list is run by Frank Warmerdam
Archive maintained by AWare Systems
Thread
2008.03.29 06:05 "Re: TIFFReadRawStrip buffer data type", by Bob Friesenhahn
On Sat, 29 Mar 2008, James Sumners wrote:
> If I supply TIFFReadRawStrip() with a buffer of type int, and read a
> grayscale image, I assume that each position in the buffer would be a
> value between 0 and 255, right? If so, then I'm a little confused
> about the debug output of my program[1]. It seems to be reading a ten
This is the description for TIFFReadRawStrip:
TIFFReadRawStrip - return the undecoded contents of a strip
of data from an open TIFF file
The term "undecoded" means that you get the raw data as it exists in
the TIFF file, including being compressed with some sort of
compression.
Maybe you mean to use TIFFReadEncodedStrip() instead?
Even with TIFFReadEncodedStrip() you will get uncompressed data packed
according to the bits per sample, samples per pixel, planar
configuration, and photometric of the file. So it could be 4 bits per
sample (two samples per byte) which refer to a color in a colormap.
Bob
======================================
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/