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<title>PSSCALE</title>
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<h1 align="center">PSSCALE</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#OPTIONS">OPTIONS</a><br>
<a href="#EXAMPLES">EXAMPLES</a><br>
<a href="#NOTES">NOTES</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<hr>
<h2>NAME
<a name="NAME"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">psscale −
Plot gray scale or color scale on maps</p>
<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>psscale
−D</b><i>xpos</i>/<i>ypos</i>/<i>length</i>/<i>width</i>[<b>h</b>]
[ <b>−A</b>[<b>a</b>|<b>l</b>|<b>c</b>] ] [
<b>−B</b>[<b>p</b>|<b>s</b>]<i>parameters</i> ] [
<b>−C</b><i>cpt_file</i> ] [
<b>−E</b>[<b>b</b>|<b>f</b>][<i>length</i>] ] [
<b>−I</b>[<i>max_intens</i>|<i>low_i</i>/<i>high_i</i>]
] [ <b>−K</b> ] [
<b>−L</b>[<b>i</b>][<i>gap</i>] ] [ <b>−M</b> ]
[ <b>−N</b><i>dpi</i> ] [ <b>−O</b> ] [
<b>−P</b> ] [ <b>−Q</b> ] [
<b>−U</b>[<i>just</i>/<i>dx</i>/<i>dy</i>/][<b>c</b>|<i>label</i>]
] [ <b>−V</b> ] [
<b>−X</b>[<b>a</b>|<b>c</b>|<b>r</b>][<i>x-shift</i>[<b>u</b>]]
] [
<b>−Y</b>[<b>a</b>|<b>c</b>|<b>r</b>][<i>y-shift</i>[<b>u</b>]]
] [ <b>−Z</b><i>zfile</i> ] [
<b>−c</b><i>copies</i> ]</p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>psscale</b>
plots gray scales or color scales on maps. Both horizontal
and vertical scales are supported. For cpt_files with
gradational colors (i.e., the lower and upper boundary of an
interval have different r/g/b values) <b>psscale</b> will
interpolate to give a continuous scale. Variations in
intensity due to shading/illumination may be displayed by
setting the option <b>−I</b>. Colors may be spaced
according to a linear scale, all be equal size, or by
providing a file with individual tile widths.</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−D</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Defines the position of the center/top (for horizontal
scale) or center/left (for vertical scale) and the
dimensions of the scale. Give a negative length to reverse
the scalebar. Append <i>h</i> to get a horizontal scale
[Default is vertical].</p></td></tr>
</table>
<h2>OPTIONS
<a name="OPTIONS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">No space
between the option flag and the associated arguments.</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p style="margin-top: 1em"><b>−A</b></p></td>
<td width="4%"></td>
<td width="78%">
<p style="margin-top: 1em">Place annotations and labels
above (instead of below) horizontal scalebars and to the
left (instead of the right) of vertical scalebars. Append
<b>a</b> or <b>l</b> to move only the annotations or the
label to the other side. Append <b>c</b> if you want to
print a vertical label as a column of characters (does not
work with special characters).</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−B</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Set annotation, tick, and gridline interval for the
colorbar. The x-axis label will plot beneath a horizontal
bar (or vertically to the right of a vertical bar), except
when using <b>−A</b>. As an option, use the y-axis
label to plot the data unit to the right of a horizontal bar
(and above a vertical bar). If <b>−B</b> is omitted,
or no annotation intervals are provided, the default is to
annotate every color level based on the numerical entries in
the cpt file (which may be overridden by ULB flags in the
cpt file). To specify custom text annotations for intervals,
you must append ;<i>annotation</i> to each z-slice in the
cpt file.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−C</b></p></td>
<td width="4%"></td>
<td width="78%">
<p><i>cpt_file</i> is the color palette file to be used. By
default all color changes are annotated. To use a subset,
add an extra column to the cpt-file with a L, U, or B to
annotate Lower, Upper, or Both color segment boundaries (but
see <b>−B</b>). If not given, <b>psscale</b> will read
stdin. Like <b><A HREF="grdview.html">grdview</A></b>, <b>psscale</b> can understand
pattern specifications in the cpt file.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−E</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Add sidebar triangles for <b>b</b>ack- and/or
<b>f</b>oreground colors. Add <b>f</b> or <b>b</b> for only
one sidebar triangle [Default gives both]. Optionally,
append triangle height [Default is half the barwidth].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−I</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Add illumination effects. Optionally, set the range of
intensities from - to + <i>max_intens</i>. If not specified,
1 is used. Alternatively, append <i>low/high</i> intensities
to specify an asymmetric range [Default is no
illumination].</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−K</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>More <i>PostScript</i> code will be appended later
[Default terminates the plot system].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−L</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Gives equal-sized color rectangles. Default scales
rectangles according to the z-range in the cpt-file (Also
see <b>−Z</b>). If set, any equal interval annotation
set with <b>−B</b> will be ignored. If <i>gap</i> is
appended and the cpt table is discrete we will center each
annotation on each rectangle, using the lower boundary
z-value for the annotation. If <b>i</b> is prepended we
annotate the interval range instead. If <b>−I</b> is
used then each rectangle will have its constant color
modified by the specified intensity.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−M</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Force a monochrome graybar using the (television) YIQ
transformation.</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−N</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Effective dots-per-inch for the rectangular image making
up the color scale [300].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−O</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Selects Overlay plot mode [Default initializes a new
plot system].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−P</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Selects Portrait plotting mode [Default is Landscape,
see <b><A HREF="gmtdefaults.html">gmtdefaults</A></b> to change this].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−Q</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Select logarithmic scale and power of ten annotations.
All z-values in the cpt file will be converted to p =
log10(z) and only integer p values will be annotated using
the 10^p format [Default is linear scale].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−S</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Do not separate different colour intervals with black
lines.</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−U</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Draw Unix System time stamp on plot. By adding
<i>just/dx/dy/</i>, the user may specify the justification
of the stamp and where the stamp should fall on the page
relative to lower left corner of the plot. For example,
BL/0/0 will align the lower left corner of the time stamp
with the lower left corner of the plot. Optionally, append a
<i>label</i>, or <b>c</b> (which will plot the command
string.). The <b><A HREF="GMT.html">GMT</A></b> parameters <b><A HREF="gmtdefaults.html#UNIX_TIME">UNIX_TIME</A></b>,
<b><A HREF="gmtdefaults.html#UNIX_TIME_POS">UNIX_TIME_POS</A></b>, and <b><A HREF="gmtdefaults.html#UNIX_TIME_FORMAT">UNIX_TIME_FORMAT</A></b> can affect
the appearance; see the <b><A HREF="gmtdefaults.html">gmtdefaults</A></b> man page for
details. The time string will be in the locale set by the
environment variable <b>TZ</b> (generally local time).</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−V</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Selects verbose mode, which will send progress reports
to stderr [Default runs "silently"].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−X −Y</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Shift plot origin relative to the current origin by
(<i>x-shift,y-shift</i>) and optionally append the length
unit (<b>c</b>, <b>i</b>, <b>m</b>, <b>p</b>). You can
prepend <b>a</b> to shift the origin back to the original
position after plotting, or prepend <b>r</b> [Default] to
reset the current origin to the new location. If
<b>−O</b> is used then the default
(<i>x-shift,y-shift</i>) is (0,0), otherwise it is (r1i,
r1i) or (r2.5c, r2.5c). Alternatively, give <b>c</b> to
align the center coordinate (x or y) of the plot with the
center of the page based on current page size.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−Z</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>File with colorbar-width per color entry. By default,
width of entry is scaled to color range, i.e., z = 0-100
gives twice the width as z = 100-150 (Also see
<b>−L</b>).</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−c</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Specifies the number of plot copies. [Default is 1].</p></td></tr>
</table>
<h2>EXAMPLES
<a name="EXAMPLES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">To append a
vertical color scale (7.5 cm long; 1.25 cm wide) to the
right of a plot that is 6 inch wide and 4 inch high, using
illumination, and show back- and foreground colors, and
annotating every 5 units, use</p>
<p style="margin-left:11%; margin-top: 1em"><b>psscale
−D</b> 6.5<b>i</b>/2<b>i</b>/7.5<b>c</b>/1.25<b>c
−O −C</b> colors.cpt <b>−I −E
−B</b> 5:BATHYMETRY:/:m: >> map.ps</p>
<h2>NOTES
<a name="NOTES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">When the cpt
file is discrete and no illumination is specified, the color
bar will be painted using polygons. For all other cases we
must paint with an image. Some color printers may give
slightly different colors for the two methods given
identical RGB values.</p>
<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><i><A HREF="GMT.html">GMT</A></i>(1),
<i><A HREF="makecpt.html">makecpt</A></i>(1), <i><A HREF="grd2cpt.html">grd2cpt</A></i>(1)</p>
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