Section: User Commands (1)
Updated: 31 October 1993
ppmtoilbm [-maxplanes|-mp N] [-fixplanes|-fp N] [-ham6|-ham8] [-dcbits|-dcplanesrgb] [-normal|-hamif|-hamforce|-24if|-24force| -dcif|-dcforce|-cmaponly] [-ecs|-aga] [-compress|-nocompress] [-cmethod type] [-mapppmfile] [-savemem] [ppmfile]
:Normal ILBMs with 1-16 planes.
:Color map (BMHD + CMAP chunk only, nPlanes = 0).
- Unofficial direct color.
- 1-16 planes for each color component.:
- Chunks writtenBMHD, CMAP, CAMG (only for HAM), BODY (not for colormap files) unofficial DCOL chunk for direct color ILBM
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.:
- -dcif (*)
- Write a HAM/24bit/direct color file if the pixmap does not fit into <maxplanes> planes.:
- -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:
- Shortcut for
- -hamplanes 8 -maxplanes 8
- Shortcut for
- -hamplanes 6 -hamforce
- 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.:
- Write a colormap file: only BMHD and CMAP chunks, no BODY chunk, nPlanes = 0.:
- See the -compress option.:
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.
Amiga ROM Kernel Reference Manual - Devices (3rd Ed.)
Copyright (C) 1989 by Jef Poskanzer.
Modified October 1993 by Ingo Wilken ([email protected])