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<TITLE>Linux Complete Command Reference:User Commands:EarthWeb Inc.-</TITLE>

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<A NAME="PAGENUM-418"><P>Page 418</P></A>





<!-- CODE SNIP //-->

<PRE>

ppmtoicr ppmfile &gt; filename

cat filename

</PRE>

<!-- END CODE SNIP //-->

<P>To display a GIF file using the protocol in a window titled after the input file, zoom the displayed image by a factor of

2, and run-length encode the data:

</P>

<!-- CODE SNIP //-->

<PRE>

giftoppm giffile | ppmtoicr -w giffile -r -e 2

</PRE>

<!-- END CODE SNIP //-->



<P><B>

BUGS

</B>

</P>

<P>The protocol uses frequent fflush calls to speed up display. If the output is saved to a file for later display via

cat, drawing will be much slower. In either case, increasing the Blocksize limit on the display will speed up transmission substantially.

</P>



<P><B>

SEE ALSO

</B>

</P>

<P>ppm(5)

</P>

<P>NCSA Telnet for the Macintosh, University of Illinois at Urbana-Champaign (1989)

</P>



<P><B>

AUTHOR

</B>

</P>

<P>Copyright&quot; 1990 by Kanthan Pillay

(svpillay@Princeton.EDU), Princeton University Computing and Information

Technology

</P>

<P>30 July 1990

</P>



<H3><A NAME="ch01_ 316">

ppmtoilbm

</A></H3>

<P>ppmtoilbm&#151;Convert a portable pixmap into an ILBM file

</P>



<P><B>

SYNOPSIS

</B>

</P>

<!-- CODE //-->

<PRE>

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]

</PRE>

<!-- END CODE //-->



<P><B>

DESCRIPTION

</B>

</P>

<P>ppmtoilbm reads a portable pixmap as input and produces an ILBM file as output. Supported ILBM types are the following:

</P>

<P>Normal ILBMs with 1_16 planes

</P>

<P>Amiga HAM with 3_16 planes

</P>

<P>24-bit

</P>

<P>Colormap (BMHD and CMAP chunk only, nPlanes = 0)

</P>

<P>Unofficial direct color     1_16 planes for each color component

</P>

<P>Chunks written:     BMHD, CMAP, CAMG (only for HAM),

BODY (not for colormap files) unofficial DCOL chunk for direct color ILBM

</P>



<P><B>

OPTIONS

</B>

</P>

<P><B>

OPTIONS

</B>

</P> marked with (*) can be prefixed with no, for example,

-nohamif. All options can be abbreviated to their

shortest unique prefix.

</P>

<TABLE>



<TR><TD>

-maxplanes | -mp n

</TD><TD>

(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 24-bit file (if -24if is used), a direct color file (if

-dcif is used). or aborts with an error.

</TD></TR><TR><TD>

-fixplanes | -fp n

</TD><TD>

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

n planes.

</TD></TR><TR><TD>

-hambits | -hamplanes n

</TD><TD>

(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.

</TD></TR></TABLE>





<A NAME="PAGENUM-419"><P>Page 419</P></A>





<TABLE>



<TR><TD>

-normal (default)

</TD><TD>

Turns off -hamif/-24if/-dcif,

-hamforce/-24force/-dcforce and -cmaponly. Also

sets compression type to byterun1.

</TD></TR><TR><TD>

-hamif (*), -24if (*),

</TD><TD>

Write a HAM/24-bit/direct color file if the pixmap does not fit into

maxplanes planes.

</TD></TR><TR><TD>

-dcif (*)

-hamforce (*), -24force (*),

</TD><TD>

Write a HAM/24-bit/direct color file.

</TD></TR><TR><TD>

-dcforce (*)

</TD><TD>

</TD></TR><TR><TD>

-dcbits | -dcplanes r g b

</TD><TD>

(default 5, min 1, max 16). Select number of bits for red, green, and blue in a direct

color ILBM.

</TD></TR><TR><TD>

-ecs (default)

</TD><TD>

Shortcut for: -hamplanes 6 -maxplanes 5

</TD></TR><TR><TD>

-aga

</TD><TD>

Shortcut for: -hamplanes 8 -maxplanes 8

</TD></TR><TR><TD>

-ham6

</TD><TD>

Shortcut for: -hamplanes 6 -hamforce

</TD></TR><TR><TD>

-ham8

</TD><TD>

Shortcut for: -hamplanes 8 -hamforce

</TD></TR><TR><TD>

-compress (*) (default),

</TD><TD>

Compress the BODY chunk. The default compression method is

byterun1. Compression

</TD></TR><TR><TD>

-cmethod none|byterun1

</TD><TD>

requires building the ILBM image in memory; turning compression off allows

stream-writing of the image, but the resulting file will usually be 30 percent to 50 percent

larger. Another alternative is the -savemem option; this will keep memory requirements

for compression at a minimum, but is very slow.

</TD></TR><TR><TD>

-map ppmfile

</TD><TD>

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.

</TD></TR><TR><TD>

-cmaponly

</TD><TD>

Write a colormap file: only BMHD and

CMAP chunks, no BODY chunk, nPlanes = 0.

</TD></TR><TR><TD>

-savemem

</TD><TD>

See the -compress option.

</TD></TR></TABLE>



<P><B>

BUGS

</B>

</P>

<P>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 (number of planes) share

a common colormap, which is useful for building HAM animations.

</P>



<P><B>

REFERENCES

</B>

</P>

<P>Amiga ROM Kernel Reference Manual&#151;Devices (Third Edition), Addison Wesley, ISBN 0-201-56775-X

</P>



<P><B>

SEE ALSO

</B>

</P>

<!-- CODE SNIP //-->

<PRE>

ppm(5), ilbmtoppm(1)

</PRE>

<!-- END CODE SNIP //-->



<P><B>

AUTHORS

</B>

</P>

<P>Copyright&quot; 1989 by Jef Poskanzer; modified October 1993 by Ingo Wilken

(Ingo.Wilken@informatik.uni-oldenburg.de).

</P>

<P>31 October 1993

</P>



<H3><A NAME="ch01_ 317">

ppmtomap

</A></H3>

<P>ppmtomap&#151;Extract all colors from a portable pixmap

</P>



<P><B>

SYNOPSIS

</B>

</P>

<!-- CODE SNIP //-->

<PRE>

ppmtomap [-sort][-square][ppmfile]

</PRE>

<!-- END CODE SNIP //-->



<P><B>

DESCRIPTION

</B>

</P>

<P>ppmtomap reads a portable pixmap as input and produces a portable pixmap as output, representing a colormap of the

input file. All N different colors found are put in an NX1 portable pixmap. This colormap file can be used as a mapfile for

ppmquant or ppmtogif.

</P>







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