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1996-03-10
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hpcdtoppm(1) USER COMMANDS hpcdtoppm(1)
NAME
hpcdtoppm v0.5 pl1 - convert a Photo-CD file into a portable
pixmap
SYNOPSIS
hpcdtoppm [options] pcd-file [ppm-file]
DESCRIPTION
Decodes a Photo-CD Image file or Overview file. Image files
you can find on the Photo-CD in photo_cd/images, they are
named as "imgnnnn.pcd", where nnnn is a 4-digit-number. The
Overview file is at photo_cd/overview.pcd . If there is no
output filename given, output will be printed to stdout.
hpcdtoppm stands for "Hadmut's pcdtoppm" to make it distin-
guishable in case someone else is building the same thing
and calling it pcdtoppm. Call hpcdtoppm without arguments to
see the defaults values. If pcd-file is "-", the Photo-CD
file is read from stdin.
OPTIONS
-x Overskip Mode. Works on Base/16, Base/4, Base and
4Base. In Photo-CD images the luma channel is stored in
full resolution, the two chroma channels are stored in
half resolution only and have to be interpolated. In
the Overskip Mode the chroma channels of the next
higher resolution are taken instead of interpolating.
To see the difference, generate one ppm with and one
ppm without this flag. Use pnmarith to generate the
difference image of these two images. Call ppmhist for
this difference or show it with xv (push the HistEq
button in the color editor).
-s Apply simple sharpness-operator on the Luma-channel.
-d Do not show the complete image, but only the
decompressed difference. It works only on the 4Base
and the 16Base resolution. It does not have any deeper
sense, but it was simple to implement and it shows what
causes different sizes of image files.
-i Give some information from the fileheader to stderr. It
works only for Image files. (It is not working
correctly, just printing some strings.)
-m Show the phases of decoding to stderr.
-crop
Try to cut off the black frame which is sometimes
scanned at the image borders. The image size shrinks.
-pos Print the file relative start position of the data for
the current resolution.
-rep Try to jump over reading errors in Huffman code.
-n Don't rotate the image.
-r Rotate the picture clockwise for portraits.
-l Rotate the picture counter-clockwise for portraits.
-a Try to find out the image orientation byself. This
doesn't work for overview files yet. It is very experi-
mental and depends on one byte. Please tell me if it
doesn't work.
-vert
Vertical flip.
-hori
Horizontal flip.
-S h v
Cut out subrectangle with boundaries h (longer side of
the image) and v (shorter side). h and v are of the
form a-b ( cut from a to b ) or a+b ( offset a, length
b). a and b are integer (pixels) or float [0.0 ... 1.0]
relative to the length of the side.
-ppm Write rgb image in ppm-format.
-pgm Write grayscale image in pgm-format.
-ycc Write ycc image in ppm-format.
-ps Write rgb image in postscript.
-eps Write rgb image in encapsulated postscript.
-psg Write grayscale image in postscript.
-epsg
Write grayscale image in encapsulated postscript.
-psd Write a Floyd-Steinberg dithered image in postscript.
See the Postscript section below.
-epsd
Write a Floyd-Steinberg dithered image in encapsulated
postscript. See the Postscript section below.
-pl f
Set left position of Postscript image to f.
-pb f
Set bottom position of Postscript image to f.
-pw f
Set width of Postscript image to f.
-ph f
Set height of Postscript image to f.
-dpi f
Set printer resolution for dithered postscript images.
See the Postscript section below.
-fak f
Sets a scaling factor for dithered postscript images.
See the Postscript section below.
-c0 Don't correct the image.
-c- Do a correction (darker). Hardware and taste dependend.
-c+ Do a correction (brighter). Hardware and taste depen-
dend.
-1 | -Base/16 | -128x192
Extract the Base/16 size picture (size 128x192 pixels).
Note that you can only give one size option.
-2 | -Base/4 | -256x384
Extract the Base/4 size picture.
-3 | -Base | -512x768
Extract the Base size picture.
-4 | -4Base | -1024x1536
Extract the 4Base size picture.
-5 | -16Base | -2048x3072
Extract the 16Base size picture.
-0 | -Overview | -O
Extract all pictures from an Overview file. A
ppmfilename must be given. If the given name is "foo",
the files are named "foonnnn", where nnnn is a 4-digit
number. Since they are stored in Base/16 format, they
are extracted in this format.
-C d s
Extract all pictures from an Overview file. A
ppmfilename must be given. If the given name is "foo",
the files are named "foonnnn", where nnnn is a 4-digit
number. Since they are stored in Base/16 format, they
are extracted in this format. s is one of "n", "l" and
"r" and determines the orientation of the contact sheet
image.
POSTSCRIPT OUTPUT
For postscript output ( ps, eps, psg, epsg, psd, epsg ) you
can choose parameters for the resolution and placement on
the paper. The default values are used if none of the fol-
lowing options is given.
The position of the image within the paper (down left
corner) is changed with the -pl and -pb option for all reso-
lutions. The unit is 1/72 inch.
For color and grayscale postscript you can change the image
size with the -pw and -ph option (1/72 inch). Every image
pixel is mapped onto one postscript pixel.
For dithered postscript (-psd and -epsd) there are three
options, the image size (-pw and -ph), the printer resolu-
tion (-dpi) and a scaling factor (-fak). Since these values
depend from each other, you can not give more than two of
these options. You should play with these options to get the
results you like. You will get pretty images if you use the
-dpi and the -pw/-ph options together. Even if you use the
default values, the result will not be the same as without
options.
BUGS
hpcdtoppm seems to ignore the read protection. :-) The
informations i have are quite vague and this program was
developed by staring at the hex-dumps and the famous trial-
and-error-method. If anything doesn't work, please send me a
report and perhaps you could try to find out, why it doesn't
work.
SEE ALSO
ppm(5), ppmquant(1), ppmtopgm(1), ppmhist(1), pnmarith(1),
ppmtorgb3(1), xv(1)
AUTHOR
Copyright (c) 1992, 1993 by Hadmut Danisch
(danisch@ira.uka.de). Permission to use and distribute this
software and its documentation for noncommercial use and
without fee is hereby granted, provided that the above copy-
right notice appear in all copies and that both that copy-
right notice and this permission notice appear in supporting
documentation. It is not allowed to sell this software in
any way. This software is not public domain.