summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/generic/pst-geo/dataII/README
diff options
context:
space:
mode:
Diffstat (limited to 'Master/texmf-dist/tex/generic/pst-geo/dataII/README')
-rw-r--r--Master/texmf-dist/tex/generic/pst-geo/dataII/README86
1 files changed, 0 insertions, 86 deletions
diff --git a/Master/texmf-dist/tex/generic/pst-geo/dataII/README b/Master/texmf-dist/tex/generic/pst-geo/dataII/README
deleted file mode 100644
index bd25910dd4e..00000000000
--- a/Master/texmf-dist/tex/generic/pst-geo/dataII/README
+++ /dev/null
@@ -1,86 +0,0 @@
-Project pst-geo-compress 2009-07-30
-========================
-
-Author: Heiko Oberdiek <oberdiek@uni-freiburg.de>
-License is LPPL 1.3c,
- maintainance status: maintained
- current maintainer: author
-
-Files:
- README (this file)
- pst-geo-compress.pl
- pst-geo-decompress.pl
-
-Requirements: Ghostscript >= 8.56 (if prediction is used)
-
-`pst-geo' (CTAN:graphics/pstricks/contrib/pst-geo/) comes with
-huge data files:
- CTAN:graphics/pstricks/contrib/pst-geo/data/data.tgz
- CTAN:graphics/pstricks/contrib/pst-geo/dataII/dataII.tgz
-Unpacked the data files consume about 134 MB.
-
-The data files (files with extension `.dat') are PostScript files.
-PostScript supports compression and decompression via filter.
-The Perl script `pst-geo-compress.pl' compresses the data files
-using the /FlateEncode filter and adds code to decompresses the file,
-if read by a PostScript interpreter. Now the space requirements of
-the data files is about 24 MB.
-
-Caveat: Filters /FlateEncode and /FlateDecode require
-PostScript language level 3 (supported by ghostscript).
-(LZW compression don't need language level 3, but
-the compression is less effective.)
-
-Size reduction details:
-* Much unnecessary white space is removed.
-* Some comments are removed (especially number comments
- in .dat files of data.tgz), the remaining comments are preserved
- (especially city names).
-* /FlateEncode filter.
-* PNG prediction (method `up') is used for most of the files.
- Spaces at line ends are added to fill the space up to
- to the columns count. This improves the prediction,
- because these files contains long lists of sorted coordinate pairs.
- The prediction columns count is also the maximal line length,
- because of a ghostscript bug:
-
-Ghostscript has a bug regarding prediction, it is fixed in
-version 8.56 (2007-03-14):
-
-| 2006-12-11T17:30:53.980862Z L. Peter Deutsch
-|
-| Fixes bug: the PNG predictor filters produced incorrect data for the last
-| pixel of each row. (The encoder and decoder had matching bugs, so
-| encode+decode produced the correct result!) Fixes a diff in PS3 CET
-| 23-12U-1.
-
-By having each line at the same length, the last byte of a row
-has always the same value (end of line character). This does
-not trigger this bug (tested with gs 7.07/8.64).
-
-After compression the files aren't human-readable any more.
-The Perl script `pst-geo-decompress.pl' can be used to
-decompress a data file.
-
-Both scripts know option -h that prints a short usage screen.
-Option --gscmd allows to configure the ghostscript programm call,
-if the automatic ghostscript isn't sufficient.
-
-`pst-geo-compress.pl' is called inside the directory where
-the data files are present. Options `-1' and `-2' choose
-between the files from `data.tgz' and `dataII.tgz'.
-
-`pst-geo-decompress.pl' expects the data file to decompress.
-If an output file is given, the result is stored there. Otherwise
-standard output is used.
-
-History:
- 2009-07-30 v1.0 First release
- 2009-07-30 v1.1:
- * Workaround for ghostscript bug added:
- * Files that are compressed with prediction have
- equal line length.
- * Removing comments (except for city data files)
- * Obsolete option --prediction is therefore removed
- * Adding standalone test mode (option `--test').
-