\
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.TH "Ppmtoilbm User Manual" 0 "31 October 1993" "netpbm documentation"

.UN lbAB
.SH NAME

ppmtoilbm - convert a PPM image into an ILBM file

.UN lbAC
.SH SYNOPSIS

\fBppmtoilbm\fP

[\fB-maxplanes\fP|\fB-mp\fP \fIN\fP]

[\fB-fixplanes\fP|\fB-fp\fP \fIN\fP]

[\fB-ham6\fP|\fB-ham8\fP]

[{\fB-dcbits\fP|\fB-dcplanes\fP} \fIr\fP \fIg\fP \fIb\fP]

[
\fB-normal\fP|\fB-hamif\fP|\fB-hamforce\fP|\fB-24if\fP|\fB-24force\fP|
\fB-dcif\fP|\fB-dcforce\fP|\fB-cmaponly\fP
]

[\fB-ecs\fP|\fB-aga\fP]

[\fB-compress\fP|\fB-nocompress\fP]

[\fB-cmethod\fP \fItype\fP]

[\fB-map\fP \fIppmfile\fP]

[\fB-savemem\fP]

[\fBppmfile\fP]

.UN lbAD
.SH DESCRIPTION
.PP
This program is part of
.BR Netpbm (1)
.
.PP
\fBppmtoilbm\fP reads a PPM image as input.  Produces an ILBM file
as output.  \fBppmtoilbm\fP understands the following ILBM types:



.IP \(bu
Normal ILBMs with 1-16 planes

.IP \(bu
Amiga HAM with 3-16 planes

.IP \(bu
24 bit

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

.IP \(bu
Unofficial direct color.  1-16 planes for each color component.


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

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


.TP
\fB-maxplanes\fP | \fB-mp\fP \fIn\fP
(default 5, minimum 1, maximum 16) Maximum planes to write in a
normal ILBM.  If the image 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.

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

.TP
\fB-hambits\fP | \fB-hamplanes\fP \fIn\fP
(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.

.TP
\fB-normal\fP
Turns off -hamif/-24if/-dcif, -hamforce/-24force/-dcforce and
-cmaponly.  Also sets compression type to byterun1.
.sp
This is the default.

.TP
\fB-hamif\fP (*)
.TP
\fB-24if\fP (*)
.TP
\fB-dcif\fP (*)
Write a HAM/24bit/direct color file if the image does not fit into
<maxplanes> planes.

.TP
\fB-hamforce\fP (*)
.TP
\fB-24force\fP (*)
.TP
\fB-dcforce\fP (*)
Write a HAM/24bit/direct color file.

.TP
\fB-dcbits\fP \fIr\fP \fIg\fP \fIb\fP
.TP
\fB-dcplanes\fP \fIr\fP \fIg\fP \fIb\fP
(default 5, min 1, max 16).  Select number of bits for red, green
and blue in a direct color ILBM.

.TP
\fB-ecs\fP
Shortcut for: -hamplanes 6 -maxplanes 5
.sp
This is the default.

.TP
\fB-aga\fP
Shortcut for: \fB-hamplanes 8 -maxplanes 8\fP

.TP
\fB-ham6\fP
Shortcut for: \fB-hamplanes 6 -hamforce\fP

.TP
\fB-ham8\fP
Shortcut for: \fB-hamplanes 8 -hamforce\fP

.TP
\fB-compress\fP (*)
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.

.TP
\fB-cmethod\fP \fBnone\fP|\fBbyterun1\fP
This option does the same thing as \fB-compress\fP.

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

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

.TP
\fB-savemem\fP
See the \fB-compress\fP option.




.UN lbAF
.SH LIMITATIONS
.PP
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.

.UN lbAG
.SH REFERENCES

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

.UN lbAH
.SH SEE ALSO
.BR ppm (5)
, 
.BR ilbmtoppm (1)


.UN lbAI
.SH AUTHORS
.PP
Copyright (C) 1989 by Jef Poskanzer.
.PP
Modified October 1993 by Ingo Wilken (\fIIngo.Wilken@informatik.uni-oldenburg.de\fP)