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Updated a bit.

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This commit is contained in:
Frank Warmerdam 2000-04-18 22:52:11 +00:00
parent 7538c6d0bc
commit 660d04c25f
1 changed files with 7 additions and 10 deletions
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contrib/addtiffo/README
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@ -19,7 +19,8 @@ http://members.home.com/warmerda
Usage Usage
----- -----
Usage: addtiffo [-subifd] tiff_filename [resolution_reductions] Usage: addtiffo [-r {average/nearest} [-subifd]
tiff_filename [resolution_reductions]
Example: Example:
% addtiffo abc.tif 2 4 8 16 % addtiffo abc.tif 2 4 8 16
@ -34,17 +35,9 @@ Limitations
See tif_overview.cpp for up to date details. See tif_overview.cpp for up to date details.
o RawBlockedImage will create temporary files in the current directory
to cache the overviews so it doesn't have to hold them all in memory.
If the application crashes these will not be deleted (*.rbi).
o Currently only images with bits_per_sample of a multiple of eight o Currently only images with bits_per_sample of a multiple of eight
will work. will work.
o The downsampler currently just takes the top left pixel from the
source rectangle. Eventually sampling options of averaging, mode, and
``center pixel'' should be offered.
o The code will attempt to use the same kind of compression, o The code will attempt to use the same kind of compression,
photometric interpretation, and organization as the source image, but photometric interpretation, and organization as the source image, but
it doesn't copy geotiff tags to the reduced resolution images. it doesn't copy geotiff tags to the reduced resolution images.
@ -119,7 +112,7 @@ TIFF Directory at offset 0x17b40c
Building Building
-------- --------
You will need a C, and C++ compiler. You will need to have libtiff already You will need a C compiler. You will need to have libtiff already
built and installed. The provided Makefile should work on most Unix systems. built and installed. The provided Makefile should work on most Unix systems.
A similar file will be needed for Windows, but is not provided. A similar file will be needed for Windows, but is not provided.
@ -140,6 +133,10 @@ Credits
o Max Martinez of Erdas for his discussion of external overviews. o Max Martinez of Erdas for his discussion of external overviews.
o Atlantis Scientific who supported adding averaging, and some other
generalizations.
o Frank Warmerdam for writing the bulk of the code. o Frank Warmerdam for writing the bulk of the code.
o Sam Leffler since this only exists because of his libtiff. o Sam Leffler since this only exists because of his libtiff.