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-
- 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)
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- Page 3 (printed 3/1/94)
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