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<H1><A NAME="SECTION001730000000000000000"></A>
<A NAME="13361"></A>
<BR>
B.3 Sun raster files
</H1>
<P>
The Sun raster file format consists of a header followed by a series
of unsigned 1-byte integers that represents the bit-pattern. Bits
are scanline oriented, and each row must contain an even number of
bytes. The predefined 1-bit
patterns in <A NAME="tex2html596"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> have dimensions of 64 by 64, but other sizes will be
accepted when using the <B>-Gp<IMG
WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img21.gif"
ALT="$\vert$">P</B> option. The Sun header structure
is outline in Table <A HREF="node119.html#tbl:sunheader">B.2</A>.
<P>
<BR><P></P>
<DIV ALIGN="CENTER"><A NAME="13390"></A>
<TABLE>
<CAPTION><STRONG>Table B.2:</STRONG>
Structure of a Sun rasterfile</CAPTION>
<TR><TD>
<DIV ALIGN="CENTER"></DIV>
<P>
<DIV ALIGN="CENTER"><TABLE CELLPADDING=3 BORDER="1">
<TR><TD ALIGN="CENTER" COLSPAN=1><I>Parameter</I></TD>
<TD ALIGN="CENTER" COLSPAN=1><I>Description</I></TD>
</TR>
<TR><TD ALIGN="LEFT"><B>int</B> <I>ras_magic</I></TD>
<TD ALIGN="LEFT">Magic number</TD>
</TR>
<TR><TD ALIGN="LEFT"><B>int</B> <I>ras_width</I></TD>
<TD ALIGN="LEFT">Width (pixels) of image</TD>
</TR>
<TR><TD ALIGN="LEFT"><B>int</B> <I>ras_height</I></TD>
<TD ALIGN="LEFT">Height (pixels) of image</TD>
</TR>
<TR><TD ALIGN="LEFT"><B>int</B> <I>ras_depth</I></TD>
<TD ALIGN="LEFT">Depth (1, 8, 24, 32 bits) of pixel</TD>
</TR>
<TR><TD ALIGN="LEFT"><B>int</B> <I>ras_length</I></TD>
<TD ALIGN="LEFT">Length (bytes) of image</TD>
</TR>
<TR><TD ALIGN="LEFT"><B>int</B> <I>ras_type</I></TD>
<TD ALIGN="LEFT">Type of file; see RT_* below</TD>
</TR>
<TR><TD ALIGN="LEFT"><B>int</B> <I>ras_maptype</I></TD>
<TD ALIGN="LEFT">Type of colormap; see RMT_* below</TD>
</TR>
<TR><TD ALIGN="LEFT"><B>int</B> <I>ras_maplength</I></TD>
<TD ALIGN="LEFT">Length (bytes) of following map</TD>
</TR>
</TABLE>
</DIV>
<P>
<DIV ALIGN="CENTER">
<A NAME="tbl:sunheader"></A></DIV></TD></TR>
</TABLE>
</DIV><P></P>
<BR>
<P>
After the header, the color map (if <I>ras_maptype</I> is not RMT_NONE)
follows for <I>ras_maplength</I> bytes, followed by an image of
<I>ras_length</I> bytes. Some related definitions are given in Table <A HREF="node119.html#tbl:sundef">B.3</A>.
<P>
<BR><P></P>
<DIV ALIGN="CENTER"><A NAME="13408"></A>
<TABLE>
<CAPTION><STRONG>Table B.3:</STRONG>
Sun macro definitions relevant to rasterfiles</CAPTION>
<TR><TD><A NAME="13398"></A>
<DIV ALIGN="CENTER"><TABLE CELLPADDING=3 BORDER="1">
<TR><TD ALIGN="CENTER" COLSPAN=1><I>Macro name</I></TD>
<TD ALIGN="CENTER" COLSPAN=1><I>Description</I></TD>
</TR>
<TR><TD ALIGN="LEFT">RAS_MAGIC</TD>
<TD ALIGN="LEFT">0x59a66a95</TD>
</TR>
<TR><TD ALIGN="LEFT">RT_STANDARD</TD>
<TD ALIGN="LEFT">1 (Raw pixrect image in 68000 byte order)</TD>
</TR>
<TR><TD ALIGN="LEFT">RT_BYTE_ENCODED</TD>
<TD ALIGN="LEFT">2 (Run-length compression of bytes)</TD>
</TR>
<TR><TD ALIGN="LEFT">RT_FORMAT_RGB</TD>
<TD ALIGN="LEFT">3 ([X]RGB instead of [X]BGR)</TD>
</TR>
<TR><TD ALIGN="LEFT">RMT_NONE</TD>
<TD ALIGN="LEFT">0 (ras_maplength is expected to be 0)</TD>
</TR>
<TR><TD ALIGN="LEFT">RMT_EQUAL_RGB</TD>
<TD ALIGN="LEFT">1 (red[ras_maplength/3],green[],blue[])</TD>
</TR>
</TABLE>
</DIV>
<P>
<DIV ALIGN="CENTER">
<A NAME="tbl:sundef"></A></DIV></TD></TR>
</TABLE>
</DIV><P></P>
<BR>
<P>
Numerous public-domain programs exist, such as <I>xv</I><A NAME="13591"></A> and
<I>convert</I><A NAME="13596"></A> (in the ImageMagick package), that will translate
between various rasterfile formats such as tiff, gif, jpeg, and
Sun raster. Raster patterns may be created with <A NAME="tex2html597"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> plotting
tools by generating <I>PostScript</I> plots that can be rasterized
by <I>ghostscript</I><A NAME="13605"></A> and translated into the right raster format.
<P>
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<ADDRESS>
Paul Wessel
2001-04-18
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