psimage - Place images or EPS files on maps
psimage imagefile [ -Drefpoint ] [
-Fbox ] [ -G[b|f|t]color ]
[ -I ] [ -Jparameters ] [
-Jz|Zparameters ] [ -K ] [ -M ] [
-O ] [ -P ] [
-Rwest/east/south/north[/zmin/zmax][+r]
] [ -U[stamp] ] [ -V[level] ] [
-Xx_offset ] [ -Yy_offset ] [ -pflags ] [
-ttransp ]
Note: No space is allowed between the option flag and the
associated arguments.
psimage reads an Encapsulated PostScript file or a raster
image file and plots it on a map. The image can be scaled arbitrarily, and
1-bit raster images can be (1) inverted, i.e., black pixels (on) becomes
white (off) and vice versa, or (2) colorized, by assigning different
foreground and background colors, and (3) made transparent where one of
back- or foreground is painted only. As an option, the user may choose to
convert colored raster images to grayscale using TV's YIQ-transformation.
For raster files, the user can select which color to be made transparent.
The user may also choose to replicate the image which, when preceded by
appropriate clip paths, may allow larger custom-designed fill patterns to be
implemented (the -Gp mechanism offered in most GMT programs is
limited to rasters smaller than 146 by 146).
- imagefile
- This must be an Encapsulated PostScript (EPS) file or a raster image. An
EPS file must contain an appropriate BoundingBox. A raster file can have a
depth of 1, 8, 24, or 32 bits and is read via GDAL. Note: If GDAL was not
configured during GMT installation then only Sun raster files are
supported natively. You must then convert other formats to Sun raster
files before use.
- -D[g|j|J|n|x]refpoint+rdpi+w[-]width[/height][+jjustify][+nnx[/ny]
][+odx[/dy]]
- Sets reference point on the map for the image using one of four coordinate
systems: (1) Use -Dg for map (user) coordinates, (2) use -Dj
or -DJ for setting refpoint via a 2-char justification code
that refers to the (invisible) map domain rectangle, (3) use -Dn
for normalized (0-1) coordinates, or (4) use -Dx for plot
coordinates (inches, cm, etc.). All but -Dx requires both -R
and -J to be specified. By default, the anchor point on the scale
is assumed to be the bottom left corner (BL), but this can be changed by
appending +j followed by a 2-char justification code justify
(see pstext). Note: If -Dj is used then justify defaults to
the same as refpoint, if -DJ is used then justify
defaults to the mirror opposite of refpoint. Add +o to
offset the color scale by dx/dy away from the
refpoint point in the direction implied by justify (or the
direction implied by -Dj or -DJ). Specify image size in one
of two ways: Use +rdpi to set the dpi of the image in dots
per inch, or use +w[-]width[/height] to set
the width (and height) of the image in plot coordinates (inches, cm,
etc.). If height is not given, the original aspect ratio of the
image is maintained. If width is negative we use the absolute value
and interpolate image to the device resolution using the PostScript image
operator. Optionally, use +nnx[/ny] to replicate the
image nx times horizontally and ny times vertically. If
ny is omitted, it will be identical to nx [Default is
1/1].
- -F[+cclearances][+gfill][+i[[gap/]pen]][+p[pen]][+r[radius]][+s[[dx/dy/][shade]]]
- Without further options, draws a rectangular border around the image using
MAP_FRAME_PEN; specify a different pen with +ppen.
Add +gfill to fill the image box [no fill]. Append
+cclearance where clearance is either gap,
xgap/ygap, or
lgap/rgap/bgap/tgap where these items are
uniform, separate in x- and y-direction, or individual side spacings
between scale and border. Append +i to draw a secondary, inner
border as well. We use a uniform gap between borders of 2p
and the MAP_DEFAULTS_PEN unless other values are specified. Append
+r to draw rounded rectangular borders instead, with a 6p
corner radius. You can override this radius by appending another value.
Finally, append +s to draw an offset background shaded region.
Here, dx/dy indicates the shift relative to the foreground
frame [4p/-4p] and shade sets the fill style to use
for shading [gray50].
- -M
- Convert color image to monochrome grayshades using the (television)
YIQ-transformation.
For perspective view p, optionally append
/zmin/zmax. (more ...)
-X[a|c|f|r][x-shift[u]]
The following options are for 1-bit images only. They have no
effect when plotting other images or PostScript files.
- -G[b|f|t]color
- -Gb
- Sets background color (replace white pixel) of 1-bit images. Use - for
transparency (and set -Gf to the desired color).
- -Gf
- Sets foreground color (replace black pixel) of 1-bit images. Use - for
transparency (and set -Gb to the desired color).
- -I
- Invert 1-bit image before plotting. This is what is done when you use
-GP to invert patterns in other GMT plotting programs.
These options are for 8-, 24-, and 32-bit raster images only. They
have no effect when plotting 1-bit images or PostScript files.
- -Gt
- Assigns the color that is to be made transparent. Sun Raster files do not
support transparency, so indicate here which color to be made
transparent.
- -^ or just -
- Print a short message about the syntax of the command, then exits (NOTE:
on Windows just use -).
- -+ or just +
- Print an extensive usage (help) message, including the explanation of any
module-specific option (but not the GMT common options), then exits.
- -? or no arguments
- Print a complete usage (help) message, including the explanation of all
options, then exits.
gmt, pslegend, To plot the image logo.jpg, scaling it be 1 inch
wide (height is scaled accordingly), and outline with a thin, blue pen,
use
gmt psimage logo.jpg -Dx0/0+w1i -F+pthin,blue > image.ps
To include an Encapsulated PostScript file tiger.eps with its
upper right corner 2 inch to the right and 1 inch up from the current
location, and have its width scaled to 3 inches, while keeping the aspect
ratio, use
gmt psimage tiger.eps -Dx2i/1i+jTR+w3i > image.ps
To replicate the 1-bit raster image template 1_bit.ras, colorize
it (brown background and red foreground), and setting each of 5 by 5 tiles
to be 1 cm wide, use
gmt psimage 1_bit.ras -Gbbrown -Gfred -Dx0/0+w1c+n5 > image.ps
gmt, gmtcolors, gmtlogo pslegend, psscale psxy,
convert(1)
2019, P. Wessel, W. H. F. Smith, R. Scharroo, J. Luis, and F.
Wobbe