Manipulation of the device colour lookup table is available when you display with a pixel map representation.
When using cursor options, generally, click the right button (enter X) to exit the function, click the left button (enter A) to add a location, and click the middle button (enter D) to delete a location.
"pixel": pixel map (formerly "grey" which is still supported),"contour": contour plot,
"both": first input image is pixel map, the second is contour overlay. If only one input image was specified it is used for both.
Default is "pixel" if one input image is specified, else "both".
Defaults are 1,1
Default is linear between the image minimum and maximum If you wish to just give a transfer function type, set range=0,0,heq say.
"hms" the label is in H M S (e.g. for RA) "dms" the label is in D M S (e.g. for DEC) "arcsec" the label is in arcsecond offsets "arcmin" the label is in arcminute offsets "absdeg" the label is in degrees "reldeg" the label is in degree offsets
The above assume the pixel increment is in radians."abspix" the label is in pixels "relpix" the label is in pixel offsets "abskms" the label is in Km/s "relkms" the label is in Km/s offsets "absghz" the label is in GHz "relghz" the label is in GHz offsets "absnat" the label is in natural coordinates as defined by
the header."relnat" the label is in offset natural coordinates
All offsets are from the reference pixel. Defaults are "abspix", LABTYP(1) unless LABTYP(1)="hms" whereupon LABTYP(2) defaults to "dms" (for RA and DEC).
"abspix" means write the region of interest in absolute integer
pixels instead of arcseconds relative to the reference pixel."box" When in "CURSOR" mode, rather than listing the value of
the of the pixel under the cursor, list the peak value in a 5x5 pixel box centred on the pixel under the cursor."cgspec" With OPTIONS=CURSOR and LOGFILE, the output log file
is is one with commands appropriate for input to CGSPEC's OLAY keyword."cgdisp" With OPTIONS=CURSOR and LOGFILE, the output log file
is one with commands appropriate for input to CGDISP's OLAY keyword.
Note that if you specify both CGSPEC and CGDISP then lines appropriate to both these programs are written into the log file. You can then copy the log file and retain the CGDISP lines in one file, and the CGSPEC lines in the other."cursor" means that after drawing each sub-plot, a cursor will
be displayed; striking any key or clicking the relevant mouse button (left) causes the location and value of the pixel under the cursor to be listed on the terminal. On terminals, enter "x" to exit the cursor. On workstations, click the relevant button (generally the right one)."fiddle" means enter a routine to allow you to interactively
change the display lookup table. You can cycle through b&w and colour displays, as well as alter the transfer function by the cursor location, or by selecting predefined transfer functions such as histogram equalization, logarithmic, and square root."grid" means draw a coordinate grid on the plot rather than just
ticks."logfile" When the "cursor" or "stats" are activated, then this
writes the results to log files (cgcurs.curs and cgcurs.stat) as well as the screen."mark" When in "CURSOR" mode, mark the locations selected. If
OPTIONS=STATS is activated, mark the minimum and maximum pixel locations too."nearest" When the cursor is used to select a location, force
that location to be the nearest image pixel, rather than the default which allows fractional pixel locations."noerase" Don't erase a snugly fitting rectangle into which the
"3-axis" value string is written."region" means use the cursor to define a polygonal region that
gets gets written to a log file as the REGION keyword. The cursor behaves as described above for the "stats" option. You can the use this in other programs as "region=@filename""stats" means that after drawing each sub-plot, you get the
opportunity to define a polygonal region with the cursor (A to add a vertex, D to delete the previous vertex, X to exit; or use the three mouse buttons) inside of which image statistics are evaluated."trlab" means label the top and right axes as well as the bottom
and left ones. This can be useful when non-linear coordinate variation across the field makes the ticks misaligned"unequal" means draw plots with unequal scales in x and y. The
default is that the scales are equal."wedge" means that if you are drawing a pixel map, also draw
and label a wedge to the right of the plot, showing the map of intensity to colour"3value" means label each sub-plot with the appropriate value
of the third axis (e.g. velocity or frequency for an xyv ordered cube, position for a vxy ordered cube)."3pixel" means label each sub-plot with the pixel value of the
the third axis. Both "3pixel" and "3value" can appear, and both will be written on the plot. They are the average values when the third axis is binned up with CHAN. If the third axis is not velocity or frequency, the units type for "3VALUE" will be chosen to be the complement of any like axis in the first two. E.g., the cube is in vxy order and LABTYP=ABSKMS,ARCSEC the units for the "3VALUE" label will be arcsec. If LABTYP=ABSKMS,HMS the "3VALUE" label will be DMS (if the third [y] axis is declination).