Hpcdtoppm User Manual(0) Hpcdtoppm User Manual(0)NAMEhpcdtoppm - convert a Photo-CD image into a PBM image
SYNOPSIShpcdtoppm infile [-a] [{-C|-0|-Overview|-O} 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 is part of Netpbm(1)
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 PBM 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 the directory
photo_cd/images, in files with names of the form imgnnnn.pcd, where
nnnn is a 4-digit-number. The overview file appears in photo_cd/over‐
view.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 exper‐
imental, 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-digit number. Overview images are
extracted in their original Base/16 format. The value of opt
determines the orientation of the contact sheet image; recog‐
nized 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 Post‐
script.
-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 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 loca‐
tions, or floating point values over the range [0.0 ... 1.0],
representing the fraction of the 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 res‐
olution, the two chromaticity channels are stored in half reso‐
lution 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 option. Use pamarith(1)
to generate the difference image of these two images. Call
ppmhist(1)
for this difference or show it with xv (push the HistEq button
in the color editor).
-ycc Write the image in a variation on PPM format in which the sam‐
ples are YCC instead of RGB.
-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.
Postcript 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).
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.
Limitations
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 ALSOpcdovtoppm(1) , pamarith(1) , ppm(5) , ppmhist(1) , pnmquant(1) , ppm‐
topgm(1) , ppmtorgb3(1) , xv
VERSION
The name hpcdtoppm stands for 'Hadmut's pcdtoppm,' to make it distin‐
guishable in the event that someone else is building a similar applica‐
tion and naming it pcdtoppm.
This is version 0.6.
AUTHOR
Copyright (c) 1992, 1993, 1994 by Hadmut Danisch (danisch@ira.uka.de).
Hadmut Danish has given permission to Bryan Henderson (August 2003) to
distribute this documentation as part of Netpbm on Sourceforge and
therefore to license this copy of this documentation to the public with
the following Sourceforge-compatible license. Note that this license
does not contain a restriction on one's right to sell the material, as
does the hpcdtoppm program itself and other copies of this documenta‐
tion.
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 appear
in all copies and that both that copyright notice and this permission
notice appear in supporting documentation.
The hpcdtoppm software itself (as opposed to this supporting documenta‐
tion) is licensed by Danisch under a similar license, but with an addi‐
tional restriction that a recipient may not sell the software or use it
in profit-making activity. See the source code of the program for
details on its license.
Manual page extensively modified by R. P. C. Rodgers
(rodgers@nlm.nih.gov).
netpbm documentation 7 August 2003 Hpcdtoppm User Manual(0)
