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1994-05-21
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hpcdtoppm(1L) AMIGA (3 March 1994) hpcdtoppm(1L)
NAME
hpcdtoppm - convert a Photo-CD file into a portable bitmap
file
SYNOPSIS
hpcdtoppm infile [-a] [{-C|-0|-Overview file opt] [-c0]
[-c-] [-c+] [-crop] [-d] [-dpi f] [-eps] [-epsd] [-epsg]
[-fak scale] [-hori] [-i] [-l] [-m] [-n] [-pb pos] [-pgm]
[-ph height] [-pl pos] [-pos] [-ppm] [-ps] [-psd] [-psg]
[-pw width] [-r] [-rep] [-S long short] [-s] [-vert] [-x]
[-ycc] [-1|-Base/16 |-128x192] [-2|-Base/4 |-256x384]
[-3|-Base |-512x768] [-4|-4Base |-1024x1536] [-5|-16Base
|-2048x3072] [-6|-64Base |-4096x6144] [outfile]
DESCRIPTION
This program accepts Photo-CD image or overview file data
from the specified input file, infile (or, if the resolution
is lower than 64Base and the file argument is specified as
-, from standard input), and writes either Portable Bitmap
Format or POSTSCRIPT to the specified output file (or to
standard output if no file is specified).
On a standard Photo-CD, image files appear in
photo_cd/images, where they appear in files with names of
the form imgnnnn.pcd, where nnnn is a 4-digit-number. The
overview file appears in photo_cd/overview.pcd.
Photo-CD images are stored using as many as 6 different
resolutions:
Format Resolution
------ ----------
64Base 4096x6144 (ProPhotoCD only)
16Base 2048x3072
4Base 1024x1536
Base 512x768
Base/4 256x384
Base/16 128x192
The overview file employs Base/16 format.
OPTIONS
Invoking hpcdtoppm without arguments produces a list of
default values. Note that you can supply only one size
option.
-a Automatically determine image orientation (this option
is experimental, and does not work for overview files).
{-C | -0 | -Overview | -O } file opt
Extract all images from an overview file. The
mandatory file argument is the name of a ppm file;
output files are named filennnn, where nnnn is a 4-
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hpcdtoppm(1L) AMIGA (3 March 1994) hpcdtoppm(1L)
digit number. Overview images are extracted in their
original Base/16 format. The value of opt determines
the orientation of the contact sheet image; recognized
values are:
n Do not rotate the image.
l Rotate the picture counter-clockwise (portrait
mode).
r Rotate the picture clockwise (portrait mode).
-c0 Do not correct (brighten or darken) the image.
-c- Darken the image.
-c+ Brighten the image.
-crop
Cut off the black frame which sometimes appears at the
image borders.
-d Show only the decompressed difference rather than the
complete image (applicable only to 4Base and 16Base
images).
-dpi res
Set the printer resolution to res for dithered
POSTSCRIPT images.
-eps Write a RGB Encapsulated POSTSCRIPT color image.
-epsd
Write a Floyd-Steinberg dithered image in Encapsulated
POSTSCRIPT.
-epsg
Write a grayscale image in Encapsulated POSTSCRIPT.
-fak scale
Set the scaling factor for dithered POSTSCRIPT images
to scale.
-hori
Flip the image horizontally.
-i Send information from an image file header to standard
error.
-l Rotate the picture counter-clockwise (portrait mode).
-m Write messages about the phases of decoding to standard
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hpcdtoppm(1L) AMIGA (3 March 1994) hpcdtoppm(1L)
error.
-n Do not rotate the image.
-pb pos
Set the bottom position of the POSTSCRIPT image to pos.
-pgm Write a pgm (grayscale) image.
-ph height
Set the height of the POSTSCRIPT image to height.
-pl pos
Set the leftmost position of the POSTSCRIPT image to
pos.
-pos Print the relative starting position of the data for
the current resolution.
-ppm Write a ppm RGB (color) image.
-ps Write a RGB POSTSCRIPT color image.
-psd Write a Floyd-Steinberg dithered image in POSTSCRIPT.
-psg Write a POSTSCRIPT grayscale image.
-pw width
Set the width of the POSTSCRIPT image to width.
-r Rotate the picture clockwise (portrait mode).
-rep Try to jump over reading errors in the Huffman code.
-S long short
Cut out a subrectangle with boundaries defined by the
values:
long For the longer side of the image.
short
For the shorter side of the image.
where long and short take one of two forms:
a-b Cut from position a to position b.
a+b Starting at offset a, cut a length of b.
and where a and b are either integers representing
pixel locations, or floating point values over the
range [0.0 ... 1.0], representing the fraction of the
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length of a side.
-s Apply a simple sharpness operator to the luminosity
channel.
-vert
Flip the image vertically.
-x Overskip Mode (applicable to Base/16, Base/4, Base and
4Base). In Photo-CD images the luminosity channel is
stored in full resolution, the two chromaticity
channels are stored in half resolution only and have to
be interpolated. In Overskip Mode, the chromaticity
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(1L) to generate the difference image of
these two images. Call ppmhist(1L) for this difference
or show it with xv(1L) (push the HistEq button in the
color editor).
-ycc Write the image in ppm YCC format.
-1|-Base/16|-128x192
Extract the Base/16 image.
-2 | -Base/4 | -256x384
Extract the Base/4 image.
-3 | -Base | -512x768
Extract the Base image.
-4 | -4Base | -1024x1536
Extract the 4Base image.
-5 | -16Base | -2048x3072
Extract the 16Base image.
-6 | -64Base | -4096x6144
Extract the 64Base image. This resolution can be
extracted from ProPhotoCD images only. The path of the
64Base extension files is derived from the path to the
image file. This means that it doesn't work on stdin an
the directory structure must be the very same as on the
ProPhotoCD.
POSTSCRIPT OUTPUT
For POSTSCRIPT output (options -ps, -eps, -psg, -epsg, -psd,
-epsg) you can define both the resolution and placement of
the image. Both size and position are specified in points
(1/72 inch).
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The position of the image (where the origin is assumed to be
at the lower left corner of the page) is controlled by the
-pl and -pb options (applicable at all resolutions).
The size of color and grayscale images is changed with the
-pw and -ph options. Every image pixel is mapped onto one
POSTSCRIPT pixel.
There are three modes of control for dithered POSTSCRIPT:
Image size
(-pw and -ph)
Printer resolution
(-dpi)
Scaling factor
(-fak)
These three factors are interdependent, hence no more then
two can be specified simultaneously. Using -dpi and the
-pw/-ph options together often yields pleasing results.
Even using the default values for these options will produce
results differing from those obtained without use of the
options.
BUGS
The program ignores read protection.
The -i option is not working correctly.
Available information obout the Photo-CD format is vague;
this program was developed by trial-and-error after staring
at hex-dumps. Please send bugs reports and patches to the
author.
SEE ALSO
pnmarith(1L), ppm(5L), ppmhist(1L), ppmquant(1L),
ppmtopgm(1L), ppmtorgb3(1L), xv(1L)
VERSION
The name hpcdtoppm stands for "Hadmut's pcdtoppm," to make
it distinguishable in the event that someone else is
building a similar application and naming it pcdtoppm. This
is version 0.6.
AUTHOR
Copyright (c) 1992, 1993, 1994 by Hadmut Danisch
(danisch@ira.uka.de). This software is not public domain.
Permission to use and distribute this software and its
documentation for noncommercial use and without fee is
hereby granted, provided that the above copyright notice
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hpcdtoppm(1L) AMIGA (3 March 1994) hpcdtoppm(1L)
appear in all copies and that both that copyright notice and
this permission notice appear in supporting documentation.
This software may not be sold or used for profit-making
activities.
Manual page extensively modified by R. P. C. Rodgers
(rodgers@nlm.nih.gov).
Page 6 (printed 5/19/94)