home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Amiga MA Magazine 1998 #7
/
amigamamagazinepolishissue1998.iso
/
varia
/
povray3
/
povray3_040
/
utils
/
ppmtoilbm.man
< prev
next >
Wrap
Text File
|
1997-12-12
|
5KB
|
191 lines
NAME
ppmtoilbm - convert a portable pixmap into an ILBM file
SYNOPSIS
ppmtoilbm [-maxplanes|-mp N] [-fixplanes|-fp N] [-ham6|-
ham8] [-dcbits|-dcplanesrg [-normal|-hamif|-hamforce -
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, 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.
-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 picture. 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
Page 1 (printed 3/1/94)
ppmtoilbm(1) AMIGA (31 October 1993) ppmtoilbm(1)
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 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.
-map ppmfile
Write a normal ILBM using the colors in <ppmfile> as
the colormap. The colormap file also determines the
number of planes, a -maxplanes or -fixplanes option is
ignored.
Page 2 (printed 3/1/94)
ppmtoilbm(1) AMIGA (31 October 1993) ppmtoilbm(1)
-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 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.
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-oldenburg.de)
Page 3 (printed 3/1/94)