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README
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1993-08-20
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This is Version 0.5 pl1 of hpcdtoppm, Hadmut's pcd to ppm converter.
It has this name to be distinguishable in case someone
else is producing a program also called pcdtoppm.
Read the README.TOO and edit the config.h and the Makefile !
This program converts Photo-CD-Images to the ppm-Format of
pbmplus. You can compile the program in two ways:
1. Use its own ppm-writing-routines. In this case
you don't need ppm-includes or libraries. You
have to define macro 'OWN_WRITE' in the source or
by compiler-option. I am not sure, whether the
format of the ppm-header is the same on non-unix
machines. If you get problems with line-endings
(things like CR, LF, CR/LF), modify the macro
PPM_Header.
2. You can use the pbmplus-routines. In this case
you need some files from the pbmplus package to compile:
ppm.h pgm.h pbm.h pbmplus.h libppm.a libpgm.a libpbm.a
IMPORTANT: Some older versions of the gcc have problems with
optimization. They produce buggy code. This code will not
die with 'segmentation fault' or something like that, it
just produces damaged images.
I did not have detailed information of the file-format and
most of my information i got by staring at the hex-dumps
of an image file. So i am not absolutly sure, whether it
works on all Photo-CDs, because there are some bytes in
the header which i don't understand. But it works on
my Photo-CD.
Note that you will get a 24 bit image. You can view these
files with xv, but if you have an 8-bit-screen you will
sometimes have some color-defects (if you have an 1-bit-screen
you will often have a lot of color-defects :-).
It will also take some time to show with xv.
You can produce nice overview prints if you get the icontact
program of Mark B. Hanson and put something like
decode pcd hpcdtoppm -1 -a
in your ~/.icrc
or by use of the pcdindex script of Pieter S. van der
Meulen in this distribution.
If you compile the program on a machine other than
SPARC please send me a short email which machine
you are using, whether you had problems or which
changes you have made.
If you port the program to any machine, please tell me,
what you did and where to get the program. Within the
last weeks i got a lot of mail asking for the special
Amiga/NeXT/SGI/... version. Read the Special.* files.
Thanks to
- Adolf Mathias (mathias@ira.uka.de) for writing some of the
postscript drivers.
- Pieter S. van der Meulen for the contact sheet script.
- Jeff for finding out how to detect the orientation of the
Overview thumbnails [ Hi Jeff, how are you? :-) ]
- A lot of people for sending mail about
compilation on MS-DOS and OS/2 and many other machines.
- lots and lots of people for sending me their improvements of the code.
Sorry, but i can not read and analyze them all. I do not have so
much time for the decoder, its my hobby, not my job. Often i get
mail with a complete source and "Hi Hadmut, i have improved your
code. It is now faster/smaller/better/something_else." But i don't
know, *what* is changed. A simple diff doesn't work, they all were
reformatting my source completely and i do not have the time to
read all sources to find the real changes. There are a lot
of real good ideas, but *please* tell me, where is the beef.
- lots of people sending me just a formatted version of my code.
Thanks to them all, and yes, i have indent(1). I prefer
this way of formatting C-source.
Hadmut Danisch (danisch@ira.uka.de)
IAKS
Universitaet Karlsruhe
Postfach 6980
Am Fasanengarten 5
D-7500 Karlsruhe (old postcode until 30.6.93)
D-76128 Karlsruhe (new postcode from 1.7.93)
Germany
FAX: +49 721 696893
Tel./FAX privat: +49 721 607306