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

- Return to the ximtool window from the graphics window

?

- 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