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ppmtoilbm(1) AMIGA (23 October 1994) ppmtoilbm(1)
NAME
ppmtoilbm - convert a portable pixmap into an IFF-ILBM,
IFF-RGBN or IFF-RGB8 file
SYNOPSIS
ppmtoilbm [-ilbm|-rgb8|-rgbn [-ecs|-aga] [-ham6|-ham8]
[-maxplanes|-mp N] [-fixplanes|-fp N]
[-normal|-hamif|-hamforce [-hambits|-hamplanes N]
[-deepbits|-deepplanes N] [-hires] [-lace] [-camg hexval]
[-floyd|-fs] [-nocompress] [-cmethod method] [-mapfile
ppmfile] [-sortcmap] [-mmethod method] [-maskfile pbmfile]
[-transparent color] [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces an IFF-ILBM,
IFF-RGB8 or IFF-RGBN file as output. Supported ILBM types
are:
Normal ILBMs
1-16 planes, with colormap. Amiga display mode Hold-
any-modify (HAM) is supported, with 3-10 planes
(including the 2 control planes).
Deep ILBMs
3-48 planes, direct RGB encoding. Usually 24 planes are
used (for 8-bit RGB values).
Colormap files
BMHD + CMAP chunk only, 0 planes.
OPTIONS
Options marked with (*) can be prefixed with a "no", e.g.
'-nohamif'. Most options can only be used for IFF-ILBM
files, if an option is usable with IFF-RGBN and IFF-RGB8 it
is noted in the description. All options can be abbreviated
to their shortest unique prefix.
-ilbm | -rgb8 | -rgbn
Write an IFF-ILBM, IFF-RGB8 or IFF-RGBN file. The
default is IFF-ILBM.
-maxplanes N
Maximum planes to write in a normal ILBM. If the
pixmap does not fit into N planes, writes a HAM file
(if -hamif is used), 24bit file (if -24if is used) or
aborts with an error. The default value is 5 planes
(for backwards compatibility), minimum value is 1 and
maximum 8. This option can be abbreviated to -mp.
Page 1 (printed 1/23/95)
ppmtoilbm(1) AMIGA (23 October 1994) ppmtoilbm(1)
-fixplanes N
If a normal ILBM is written, it will have exactly N
planes, even if the number of colors would fit into
fewer planes. This option can be abbreviated to -fp.
-hamplanes N
Set the number of planes (including the two control
planes) for a HAM picture. The current Amiga hardware
supports 6 and 8 planes, so for now you should use only
these values. The default value is 6 (for backwards
compatibility), minimum value is 3, maximum 10.
-hambits N
Set the number of bits for a color component or index
value in a HAM picture. This is the same as
-hamplanesN+2
-deepplanes N
Set the number of planes for a deep ILBM. N must be
divisible by 3.
-deepbits N
Set the number of bits for a color component in a deep
ILBM. This is the same as -deepplanes3*N
-normal
Turns off -hamif, -24if, -hamforce, -24force, -deepif,
-deepforce and -cmaponly and sets compression type to
byterun1. This is the default mode for IFF-ILBM files.
-hamif (*) | -24if (*)
Write a HAM or 24bit file if the pixmap does not fit
into the maximum number of planes as given by the
-maxplanes option.
-hamforce (*) | -24force (*)
Write a HAM or 24bit file.
-cmaponly
Write a colormap file: only BMHD and CMAP chunks, no
BODY chunk, nPlanes = 0.
-ecs | -aga
Page 2 (printed 1/23/95)
ppmtoilbm(1) AMIGA (23 October 1994) ppmtoilbm(1)
Set the appropriate -hamplanes and -maxplanes values
for the Amiga ECS or AGA chipset. ECS values are used
by default for backwards compatibility.
-ham6 | -ham8
Write a HAM picture with 6/8 planes.
-hires (*), -lace (*)
Sets the HIRES and LACE bits in the CAMG chunk and
adjusts BMHD.xAspect/BMHD.yAspect accordingly. Other
bits might be set in the CAMG chunk depending on other
options. These options can be used with IFF-RGBN and
IFF-RGB8 files.
-camg hexval
Write a specific value into the CAMG chunk. The
hexadecimal value can be given with or without a 0x
prefix. Other bits might be set in the CAMG chunk
depending on other options. This option can be used
with IFF-RGBN and IFF-RGB8 files.
-nocompress
Do not compress the BODY chunk. 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. This
options affect only IFF-ILBM files, IFF-RGBN and IFF-
RGB8 files are always compressed using a pixel repeat
count.
-cmethod method
Select compression method. Default is byterun1.
Setting method to none is equivalent to using a
-nocompress option. method can be abbreviated to the
shortest unique prefix.
-mapfile ppmfile
Use the colors in ppmfile as the colormap when writing
a normal ILBM. The mapfile is a normal PPM image, it
can be any shape, all that matters are the colors in
it, and the order they appear in. If the colors in the
input file do not match those in ppmfile , they are
matched to a "best match".
-sortcmap
Page 3 (printed 1/23/95)
ppmtoilbm(1) AMIGA (23 October 1994) ppmtoilbm(1)
Sort the colormap.
-mmethod method
Select masking method. method can be none
(no masking, default), maskplane and transparentcolor
(only for normal ILBMs). lasso masks are are not
supported yet. method can be abbreviated to the
shortest unique prefix.
-maskfile pbmfile
Use a mask file to mark transparent pixels in an IFF-
ILBM. If the -mmethod option is not used, masking
method is set to maskplane. pbmfile is a normal PBM
image, the same size (or larger) as the input file. A
pixel value of PBM_WHITE in the mask file means the
corresponding in the input file is considered to be
transparent, PBM_BLACK indicates an opaque pixel (think
of the input file casting a shadow on a white screen).
In an IFF-RGBN or IFF-RGB8 file, the mask file is used
to set the genlock bits.
-transparent color
Mark the given color as transparent. The color is
specified as in ppmmake(1). If the -mmethod options is
not used, masking method is set to transparentcolor.
-floyd (*) | -fs (*)
Use Floyd-Steinberg error diffusion for mapping the
input colors to HAM or to the colors in a mapfile. The
results are usually much better than without it, but it
takes substantially more CPU time, so the default is
off.
BUGS
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.
Not all IFF-ILBM types that are supported by can be
generated with
The number of options for this program is approaching the
ls(1)-dangerlevel.
REFERENCES
Page 4 (printed 1/23/95)
ppmtoilbm(1) AMIGA (23 October 1994) ppmtoilbm(1)
Amiga ROM Kernel Reference Manual - Devices (3rd Ed.),
Addison Wesley, ISBN 0-201-56775-X, Appendix A: Interchange
File Format
SEE ALSO
ppm(5), ilbmtoppm(1)
AUTHORS
Copyright (C) 1989 by Jef Poskanzer.
Modified 1993/1994 by Ingo Wilken
(Ingo.Wilken@informatik.uni-oldenburg.de)
Page 5 (printed 1/23/95)