NAME
    ppmtoilbm - convert a portable pixmap into an ILBM file

SYNOPSIS
    ppmtoilbm  [-maxplanes|-mp  N]  [-fixplanes|-fp  N]  [-ham6|-ham8]
    [-dcbits|-dcplanesrgb]    [-normal|-hamif|-hamforce|-24if|-24force|
    -dcif|-dcforce|-cmaponly] [-ecs|-aga] [-compress|-nocompress] [-cmethod
    type] [-mapppmfile] [-savemem] [ppmfile]

DESCRIPTION
    Reads a portable pixmap as input. Produces an ILBM file as output.
    Supported ILBM types are:

    Normal ILBMs with 1-16 planes.

    Amiga HAM with 3-16 planes.

    24 bit.

    Color map (BMHD + CMAP chunk only, nPlanes = 0).

    Unofficial direct color.
    1-16 planes for each color component.

    Chunks written:
    BMHD, CMAP, CAMG (only for HAM), BODY (not for colormap files)
    unofficial DCOL chunk for direct color ILBM

OPTIONS
    Options marked with (*) can be prefixed with a "no", e.g. "-nohamif".
    All options can be abbreviated to their shortest unique prefix.

    -maxplanes | -mp n
    (default 5, minimum 1, maximum 16) Maximum planes to write in a
    normal ILBM. If the pixmap does not fit into <n>  planes, ppm-
    toilbm writes a HAM file (if -hamif is used), a 24bit file (if
    -24if is used) or a direct color file (if -dcif  is used) or
    aborts with an error.

    -fixplanes | -fp n
    (min 1, max 16) If a  normal  ILBM is written, it will have
    exactly <n> planes.

    -hambits | -hamplanes n
    (default 6, min 3, max 16) Select number of planes for HAM pic-
    ture.  The current Amiga hardware supports 6 and 8 planes, so
    for now you should only use this values.

    -normal (default)
    Turns off  -hamif/-24if/-dcif, -hamforce/-24force/-dcforce and
    -cmaponly. Also sets compression type to byterun1.

    -hamif (*)

    -24if (*)

    -dcif (*)
    Write a HAM/24bit/direct color file if the pixmap does not fit
    into <maxplanes> planes.

    -hamforce (*)

    -24force (*)

    -dcforce (*)
    Write a HAM/24bit/direct color file.

    -dcbits | -dcplanes r g b
    (default 5, min 1, max 16). Select number of bits for red,
    green & blue in a direct color ILBM.

    -ecs (default)
    Shortcut for: -hamplanes 6 -maxplanes 5

    -aga

    Shortcut for: -hamplanes 8 -maxplanes 8

    -ham6

    Shortcut for: -hamplanes 6 -hamforce

    -ham8 Shortcut for: -hamplanes 8 -hamforce

    -compress (*) (default)

    -cmethod none|byterun1
    Compress the BODY chunk.  The  default compression method is
    byterun1.  Compression requires building the ILBM image in mem-
    ory; turning compression off allows stream-writing of the image,
    but the resulting file will usually be  30% to 50% larger.
    Another alternative is the -savemem option, this will keep mem-
    ory requirements for compression at a minimum, but is very slow.

    -map ppmfile
    Write a normal ILBM using the colors in <ppmfile> as the col-
    ormap. The colormap file also determines the number of planes, a
    -maxplanes or -fixplanes option is ignored.

    -cmaponly
    Write a colormap file: only BMHD and CMAP chunks, no BODY chunk,
    nPlanes = 0.

    -savemem
    See the -compress option.

BUGS
    HAM pictures will always get a grayscale colormap; a real color selec-
    tion algorithm might give better results. On the other hand, this
    allows row-by-row operation on HAM images, and all HAM images of the
    same depth (no. of planes) share a common colormap, which is useful for
    building HAM animations.

REFERENCES
    Amiga ROM Kernel Reference Manual - Devices (3rd Ed.)
    Addison Wesley, ISBN 0-201-56775-X

SEE ALSO
    ppm(5),ilbmtoppm(1)

AUTHORS
    Copyright (C) 1989 by Jef Poskanzer.
    Modified October 1993 by Ingo Wilken (Ingo.Wilken@informatik.uni-olden-
    burg.de)