AIPS HELP file for HUEWEDGE in 31DEC20
As of Mon Aug 10 2:26:20 2020
HUEWEDGE: Verb to load a step wedge of image intensities as
previously loaded (shows only the map values actually
TVCHAN 0.0 16.0 TV channel for intensity
TV2CHAN 0.0 16.0 TV channel for hue
PIXRANGE Range of intensities for
DOINVERS -1.0 1.0 > 0 intensity wedge on X
<= 0 on Y, hue on X
LABEL 0.0 7.0 Label parts: = 7 all
GRCHAN 0.0 8.0 Graphics channel for label
Optional immediate argument gives width of wedge
in pixels (default 16). If argument < 0,
program uses TV cursor to determine where to
put wedge (default below bottom or above top
of image). Point to left or right of image
to get a vertical wedge.
Use: Loads a linear step wedge into the TV memory associated with
the hue image using the PIXRANGE and FUNCTYPE of that image's
TVLOAD. A wedge, constant in X and changing in Y, is also
loaded to the TV memory associated with the intensity image.
The intensities of that wedge use the FUNCTYPE of the intensity
image TVLOAD and a PIXRANGE limited by the PIXRANGE of the
intensity image TVLOAD. This allows you to select a narrower
range of intensities for the vertical direction including no
range at all.
There is an optional immediate argument:
If n is missing, use n=16, where n is the width of the
wedge in pixels. If n<0 use abs(n) as the width of the
wedge and ask the user to indicate where to draw the
wedge. The default locations of the wedge are:
(a) just below the image (if it will fit) (b) above the
image (if it will fit), and (d) overlaying the bottom
rows of the image.
To get a vertical wedge, use n < 0 and select a point to the
right or left of the image. The X position you select is taken
as the left edge of the vertical wedge. For horizontal wedges
use n > 0 or, with n < 0, point below or above or inside the
image. The point you select is the bottom of the horizontal
Note that, if HUEWEDGE is used in a FOR or WHILE loop or in an
IF-THEN-ELSE construct, then the immediate argument is
required. Otherwise, some item necessary to the loop/construct
will be taken as the immediate argument.
TVCHAN.....TV channel for intensity image.
TV2CHAN....TV channel for hue image. If either is out of range, 1
and 2 are used.
PIXRANGE...Limit the intensity wedge direction to PIXRANGE.
0,0 => as TVLOAD. Will be set to the TVLOAD if
outside the TVLOD range.
DOINVERS...> 0 => intensity wedge on long axis, hue on short
i.e. horizontal wedge has intensity on X, hue on
Y, vertical wedge has intensity on Y hue on X
<= 0 => hue wedge on long axis, intensity on short
LABEL......0 => no labeling
1 => label intensity wedge axis
2 => label hue wedge axis
4 => label image
3 => label both wedge axes
5 => label image and intensity wedge axis
6 => label image and hue wedge axis
7 => label everything
GRCHAN.....Graphics channel for labeling: 0 => 2