ppmtoilbm

ppmtoilbm

NAME SYNOPSIS DESCRIPTION OPTIONS BUGS REFERENCES SEE ALSO AUTHORS

NAME

ppmtoilbm - convert a portable pixmap into an ILBM file

SYNOPSIS

ppmtoilbm [__-maxplanes__ [__-fixplanes__ [__-ham6__ [__-dcbits__ [[-normal|-hamif|-hamforce|-24if|-24force__|

• dcif|-dcforce|-cmaponly]

[__-ecs__ [__-compress__ [unrenderable node] [__-map__ppmfile____ [__-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

-maxplanes | -mp n

(default 5, minimum 1, maximum 16) Maximum planes to write in a normal ILBM. If the pixmap does not fit into

-fixplanes | -fp n

(min 1, max 16) If a normal ILBM is written, it will have exactly

-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

-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

-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

-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)