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- This is just a short descriptions of the specialties of this version.
- For more information, read the manuals and the file "USAGE".
-
-
- GENERAL USAGE
- -------------
- This version is configured to behave in unix-style, that is, to
- write their output to stdout instead to a file and read their
- input from stdin if no file is given.
-
- Thus, the syntax is (substitute c or d for X):
- Xjpeg [options] [inputfile] > outputfile
- and NOT
- Xjpeg [options] inputfile outputfile
-
- Why? Well, because (a) because all PBMPlus programs behave that way,
- and (b) its useful for pipes:
- djpeg -pnm foo.jpg | ppmquant 32 | ppmtoilbm > foo.ilbm
- ilbmtoppm foo.ilbm | cjpeg -smooth 20 > foo.jpg
-
-
- VIRTUAL MEMORY
- --------------
- Memory usage is limited to 1M as a default. If a program needs more memory,
- it uses temporary files.
-
- You can control the maximum memory in two ways:
- a) with the option -maxmemory
- b) with an environment variable JPEGMEM
-
- For example, if you want the programs to use up to 4M before using temporary
- files, just do this:
- setenv JPEGMEM "4M"
-
- You can also control where the temporary files go. The default is JPEGTMP:,
- but you can override this with an environment variable JPEGTMP (don't get
- confused, the first is an assign, the second the name of an environment var).
- The environment variable gives the name of a directory, thus its value must
- end in ':' or '/'. For example:
- setenv JPEGTMP "work:temp/jpeg/"
-
-
- TECHNICAL INFO
- --------------
- The programs were compiled with DICE 2.07.54R. They are "pure" (can be made
- resident) and use dynamic stacks (if they run out of stack they automagically
- allocate some more space).
-
-
- Happy jpeg'ing,
- Ingo
- email: Ingo.Wilken@informatik.uni-oldenburg.de
-
-