contour - display iso-intensity contour levels

  contour[/qualifiers]

A contour plot is drawn. It is recommended that the image be rebinned and smoothed first. The user can specify the number of levels to use, with the qualifier /NO_OF_CONT_LEVELS, a default number of 10 levels is used otherwise. The option /FIRST_CONTOUR_DRAWN defines the first (lowest) level to be displayed. By default the lowest 5 levels are not displayed.

contour/linear

Conturing image with linear scale histogram

contour/log

Contouring image with logarithmic histogram

contour/histo

Conturing image using image histogram to define levels. This is the default option for command CONTOUR

countor/div_map

Contours calculated on the map ratio obtained dividing the current image by the saved image.

countor/div_saved

Contours calculated on the map ratio obtained dividing the saved image by the current image.

contour/sub_map

Contours calculated on the image obtained from the current minus the saved image. If the result is a negative number, it will reset it to zero.

countor/exposure

Exposure map contours are plotted.

countor/saved_image

Saved image contours are plotted.

countor/correct_exposure

Contours calculated on the current map corrected by the exposure map.

contour/no_frame

The contours are plotted without frame. This qualifier is usefull when the contours plot are overlayed (see /overlay) on a pre-display image.

contour/no_of_cont_levels=nn

This defines the number of contour levels, nn, to be used.

contour/first_contour_drawn=nn

This defines the number of the lower contour used for display.

contour/color=m

The color number, m, to be used for the contours range of allowed values is 1 to the max number of color levels supported by the display used.

contour/overlay

The contour plot is overlayed to the pre-displayed image. The default is that the contour plot is drawn on a new Pgplot page.

contour/left

The qualifier left allows the display to appear on the lefthand side of the screen. Any subsequent interacting command with the Pgplot screen will act on the lefthand side. If a contour plot already is displayed on the righthand side of the screen, a second contour plot can be displayed on the lefthand side. This is done using the '/OVERLAY' qualifier, which allows a second plot to be displayed on the screen without erasing the first. So, if you use the 'CONTOUR/LEFT/OVERLAY' command, the second contour plot will appear on the lefthand side beside the first.

contour/right

The qualifier right allows the display to appear on the righthand side of the screen. If a contour plot already is displayed on the lefthand side of the screen, a second contour plot can be displayed on the righthand side. This is done using the '/OVERLAY ' qualifier, which allows a second plot to be displayed on the screen without erasing the first. So, if you use the 'CONTOUR/RIGHT/OVERLAY' command, the second contour plot will appear on the righthand side beside the first.

cont/v1=x

/v1,/v2,/v3,/v4 control where the image is displayed.

cont/v1=x

/v1,/v2,/v3,/v4 control where the image is displayed.

cont/v2=x

/v1,/v2,/v3,/v4 control where the image is displayed.

cont/v3=x

/v1,/v2,/v3,/v4 control where the image is displayed.

cont/v4=x

/v1,/v2,/v3,/v4 control where the image is displayed.

cont/scale=x

Controls the scale applied to the labels around the image.

cont/file=filename

Allow to input contour levels from an ascii file, which contains a column of level values.

Examples:

 
contour/no_of_cont_levels=20/first_contour=4   ! generate a contour plot with
                                               ! 20 levels, and level 4 to
                                               ! level 20
contour/no_of=20/first=4/overlay/col=5         ! same as before but also
                                               ! overlay the contour on the
                                               ! previous image using color 5