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-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 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 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).
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.
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 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.