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# Using imexamine

The imexamine task provides some of the most powerful diagnostic quick-look tools within IRAF. If an image that you wish to examine is already displayed in the ximtool window, simply type imexamine. Wait patiently without moving the mouse and a blinking, round cursor will appear on the display. (If you lose patience, try pressing the ``L5" key without moving the cursor.) Place the cursor over a star, and strike the r key, and you will be presented with a radial plot of the star, along with the values of a fit to the stellar profile. The last number displayed is the FWHM in pixels, quite useful for determining the best focus. Other very useful commands include l for making a line plot at the position of the cursor, and c for making a column plot at the position of the cursor. Other useful cursor strokes are shown below.

r
- Make a radial profile of the star near the cursor. The FWHM will be the last number shown in the plot.
a
- Print FWHM without showing the radial plot.
c
- Plot the column nearest the image cursor
l
- Plot the line nearest the image cursor
j
- Fit a 1-d Gaussian in the x direction, centered near the cursor
k
- Fit a 1-d Gaussian in the y direction, centered near the cursor
m
- Print the statistics in a box around the image cursor
e
- Make a contour plot of a region around the image cursor
h
- Plot the histogram of a region around the image cursor
s
- Make a surface plot of a region around the image cursor
:c N
- Plot column N when in graphics mode
:l N
- Plot line N when in graphics mode
:naverage M
- ave M columns (or lines) during plots
x
- Print the x, y, z values of the pixel nearest the image cursor
z
- Print a 10 by 10 grid of pixels around the image cursor
o
- Overplot
g
- Go to the graphics window from the ximtool window
i
?
- Print help
q
- Quit imexamine
:epar r
- Edit the radial profile plot parameters
:epar c
- Edit the column plot parameters
:epar e
- Edit the contour plot parameters
:epar h
- Edit the histogram plot parameters
:epar l
- Edit the line plot parameters
:epar s
- Edit the surface plot parameters

Next: Running ICE from a VT640 Previous: Using ximtool
jbarnes@noao.edu
Tue Feb 14 07:48:00 MST 1995