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Ppmtoilbm User Manual
.SH 1
ppmtoilbm
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Updated: 31 October 1993
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Table Of Contents
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NAME
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ppmtoilbm - convert a PPM image into an ILBM file
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SYNOPSIS
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\fBppmtoilbm\fR
[\fB-maxplanes\fR|\fB-mp\fR \fIN\fR]
[\fB-fixplanes\fR|\fB-fp\fR \fIN\fR]
[\fB-ham6\fR|\fB-ham8\fR]
[{\fB-dcbits\fR|\fB-dcplanes\fR} \fIr\fR \fIg\fR \fIb\fR]
[
\fB-normal\fR|\fB-hamif\fR|\fB-hamforce\fR|\fB-24if\fR|\fB-24force\fR|
\fB-dcif\fR|\fB-dcforce\fR|\fB-cmaponly\fR
]
[\fB-ecs\fR|\fB-aga\fR]
[\fB-compress\fR|\fB-nocompress\fR]
[\fB-cmethod\fR \fItype\fR]
[\fB-map\fR \fIppmfile\fR]
[\fB-savemem\fR]
[\fBppmfile\fR]
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DESCRIPTION
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This program is part of Netpbm.
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\fBppmtoilbm\fR reads a PPM image as input.  Produces an ILBM file
as output.  \fBppmtoilbm\fR understands the following ILBM types:
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Normal ILBMs with 1-16 planes
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Amiga HAM with 3-16 planes
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24 bit
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Color map (BMHD + CMAP chunk only, nPlanes = 0)
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Unofficial direct color.  1-16 planes for each color component.
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Chunks written: BMHD, CMAP, CAMG (only for HAM), BODY (not for
colormap files) unofficial DCOL chunk for direct color ILBM.
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OPTIONS
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Options marked with (*) can be prefixed with a "no",
e.g. "-nohamif".  All options can be abbreviated to their
shortest unique prefix.
.RS
.IP "\fB-maxplanes\fR | \fB-mp\fR \fIn\fR"
(default 5, minimum 1, maximum 16) Maximum planes to write in a
normal ILBM.  If the pixmap does not fit into <n> planes,
ppmtoilbm 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.
.IP "\fB-fixplanes\fR | \fB-fp\fR \fIb\fR"
(min 1, max 16) If a normal ILBM is written, it will have exactly
<n> planes.
.IP "\fB-hambits\fR | \fB-hamplanes\fR \fIn\fR"
(default 6, min 3, max 16) Select number of planes for HAM
picture.  The current Amiga hardware supports 6 and 8 planes, so for
now you should only use this values.
.IP "\fB-normal\fR"
Turns off -hamif/-24if/-dcif, -hamforce/-24force/-dcforce and
-cmaponly.  Also sets compression type to byterun1.
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This is the default.
.IP "\fB-hamif\fR (*)"
.IP "\fB-24if\fR (*)"
.IP "\fB-dcif\fR (*)"
Write a HAM/24bit/direct color file if the image does not fit into
<maxplanes> planes.
.IP "\fB-hamforce\fR (*)"
.IP "\fB-24force\fR (*)"
.IP "\fB-dcforce\fR (*)"
Write a HAM/24bit/direct color file.
.IP "\fB-dcbits\fR \fIr\fR \fIg\fR \fIb\fR"
.IP "\fB-dcplanes\fR \fIr\fR \fIg\fR \fIb\fR"
(default 5, min 1, max 16).  Select number of bits for red, green
and blue in a direct color ILBM.
.IP "\fB-ecs\fR"
Shortcut for: -hamplanes 6 -maxplanes 5
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This is the default.
.IP "\fB-aga\fR"
Shortcut for: \fB-hamplanes 8 -maxplanes 8\fR
.IP "\fB-ham6\fR"
Shortcut for: \fB-hamplanes 6 -hamforce\fR
.IP "\fB-ham8\fR"
Shortcut for: \fB-hamplanes 8 -hamforce\fR
.IP "\fB-compress\fR (*)"
This is the default.
Compress the BODY chunk.  The default compression method is
byterun1.  Compression requires building the ILBM image in memory;
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 memory requirements for
compression at a minimum, but is very slow.
.IP "\fB-cmethod\fR \fBnone\fR|\fBbyterun1\fR"
This option does the same thing as \fB-compress\fR.
.IP "\fB-map\fR \fIppmfile\fR"
Write a normal ILBM using the colors in <ppmfile> as the
colormap.  The colormap file also determines the number of planes, a
\fB-maxplanes\fR or \fB-fixplanes\fR option is ignored.
.IP "\fB-cmaponly\fR"
Write a colormap file: only BMHD and CMAP chunks, no BODY chunk,
nPlanes = 0.
.IP "\fB-savemem\fR"
See the \fB-compress\fR option.
.RE
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LIMITATIONS
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HAM pictures will always get a grayscale colormap; a real color
selection 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.
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REFERENCES
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Amiga ROM Kernel Reference Manual - Devices (3rd Ed.)
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Addison Wesley, ISBN 0-201-56775-X
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SEE ALSO
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ppm, 
ilbmtoppm
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AUTHORS
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Copyright (C) 1989 by Jef Poskanzer.
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Modified October 1993 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
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\l'5i'
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Table Of Contents
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NAME
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SYNOPSIS
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DESCRIPTION
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OPTIONS
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LIMITATIONS
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REFERENCES
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SEE ALSO
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AUTHORS
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