AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

2008.03.29 04:18 "[Tiff] TIFFReadRawStrip buffer data type", by James Sumners
2008.03.29 06:05 "Re: [Tiff] TIFFReadRawStrip buffer data type", by Bob Friesenhahn
2008.03.29 11:44 "Re: [Tiff] TIFFReadRawStrip buffer data type", by James Sumners
2008.03.29 15:41 "Re: [Tiff] TIFFReadRawStrip buffer data type", by Bob Friesenhahn
2008.03.29 16:26 "Re: [Tiff] TIFFReadRawStrip buffer data type", by James Sumners
2008.03.29 14:58 "Re: [Tiff] TIFFReadRawStrip buffer data type", by Frank Warmerdam
2008.03.29 16:29 "Re: [Tiff] TIFFReadRawStrip buffer data type", by James Sumners
2008.03.29 16:51 "Re: [Tiff] TIFFReadRawStrip buffer data type", by Bob Friesenhahn
2008.04.24 14:16 "Re: [Tiff] TIFFReadRawStrip buffer data type", by James Sumners

2008.03.29 06:05 "Re: [Tiff] TIFFReadRawStrip buffer data type", by Bob Friesenhahn

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/