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ppmtoilbm - convert a portable pixmap into an ILBM file |
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] |
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 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. |
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.) |
ppm(5), ilbmtoppm(1) |
Copyright (C) 1989 by Jef Poskanzer. |