ppmtoilbm

convert a portable pixmap into an ILBM file

Synopsis

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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 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.

-cmaponly

Write a colormap file: only BMHD and CMAP chunks, no BODY chunk, nPlanes = 0.

-savemem

See the -compress option.

references

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

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.

see also

ppm, ilbmtoppm

authors

Copyright (C) 1989 by Jef Poskanzer.
Modified October 1993 by Ingo Wilken (Ingo.Wilken[:at:]informatik[:dot:]uni-oldenburg.de)