PSSCALE(1) Generic Mapping Tools PSSCALE(1)NAMEpsscale - Plot gray scale or color scale on maps
SYNOPSISpsscale -Dxpos/ypos/length/width[h] [ -A[a|l|c] ] [ -B[p|s]parameters ]
[ -Ccpt_file ] [ -E[b|f][length] ] [ -I[max_intens|low_i/high_i] ] [ -K
] [ -L[i][gap] ] [ -M ] [ -Ndpi ] [ -O ] [ -P ] [ -Q ] [
-U[just/dx/dy/][c|label] ] [ -V ] [ -X[a|c|r][x-shift[u]] ] [
-Y[a|c|r][y-shift[u]] ] [ -Zzfile ] [ -ccopies ]
DESCRIPTIONpsscale 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) psscale will interpolate to give a continuous scale. Varia‐
tions in intensity due to shading/illumination may be displayed by set‐
ting the option -I. Colors may be spaced according to a linear scale,
all be equal size, or by providing a file with individual tile widths.
-D 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
h to get a horizontal scale [Default is vertical].
OPTIONS
No space between the option flag and the associated arguments.
-A Place annotations and labels above (instead of below) horizontal
scalebars and to the left (instead of the right) of vertical
scalebars. Append a or l to move only the annotations or the
label to the other side. Append c if you want to print a verti‐
cal label as a column of characters (does not work with special
characters).
-B Set annotation, tick, and gridline interval for the colorbar.
The x-axis label will plot beneath a horizontal bar (or verti‐
cally to the right of a vertical bar), except when using -A. 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 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 ;annotation to each z-slice in the cpt file.
-C cpt_file is the color palette file to be used. By default all
color changes are annotated. To use a subset, add an extra col‐
umn to the cpt-file with a L, U, or B to annotate Lower, Upper,
or Both color segment boundaries (but see -B). If not given,
psscale will read stdin. Like grdview, psscale can understand
pattern specifications in the cpt file.
-E Add sidebar triangles for back- and/or foreground colors. Add f
or b for only one sidebar triangle [Default gives both].
Optionally, append triangle height [Default is half the bar‐
width].
-I Add illumination effects. Optionally, set the range of intensi‐
ties from - to + max_intens. If not specified, 1 is used.
Alternatively, append low/high intensities to specify an asym‐
metric range [Default is no illumination].
-K More PostScript code will be appended later [Default terminates
the plot system].
-L Gives equal-sized color rectangles. Default scales rectangles
according to the z-range in the cpt-file (Also see -Z). If
set, any equal interval annotation set with -B will be ignored.
If gap 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 i is prepended we annotate the
interval range instead. If -I is used then each rectangle will
have its constant color modified by the specified intensity.
-M Force a monochrome graybar using the (television) YIQ transfor‐
mation.
-N Effective dots-per-inch for the rectangular image making up the
color scale [300].
-O Selects Overlay plot mode [Default initializes a new plot sys‐
tem].
-P Selects Portrait plotting mode [Default is Landscape, see gmtde‐
faults to change this].
-Q 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].
-S Do not separate different colour intervals with black lines.
-U Draw Unix System time stamp on plot. By adding just/dx/dy/, 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 label, or c (which will plot the command
string.). The GMT parameters UNIX_TIME, UNIX_TIME_POS, and
UNIX_TIME_FORMAT can affect the appearance; see the gmtdefaults
man page for details. The time string will be in the locale set
by the environment variable TZ (generally local time).
-V Selects verbose mode, which will send progress reports to stderr
[Default runs "silently"].
-X -Y Shift plot origin relative to the current origin by (x-shift,y-
shift) and optionally append the length unit (c, i, m, p). You
can prepend a to shift the origin back to the original position
after plotting, or prepend r [Default] to reset the current
origin to the new location. If -O is used then the default (x-
shift,y-shift) is (0,0), otherwise it is (r1i, r1i) or (r2.5c,
r2.5c). Alternatively, give c to align the center coordinate (x
or y) of the plot with the center of the page based on current
page size.
-Z 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 -L).
-c Specifies the number of plot copies. [Default is 1].
EXAMPLES
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 illumina‐
tion, and show back- and foreground colors, and annotating every 5
units, use
psscale-D 6.5i/2i/7.5c/1.25c -O-C colors.cpt -I -E -B 5:BATHYME‐
TRY:/:m: >> map.ps
NOTES
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.
SEE ALSOGMT(1), makecpt(1), grd2cpt(1)GMT 4.5.14 1 Nov 2015 PSSCALE(1)
