NAME
    hpcdtoppm - convert a Photo-CD file into a portable bitmap file

SYNOPSIS
    hpcdtoppm 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 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 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
    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 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 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.

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 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).
    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.

    Manual page  extensively  modified by  R.   P.  C.  Rodgers
    (rodgers@nlm.nih.gov).