The Main-Display Window displays the current value of the CCD.
Contents
How to Operate the Main Image Display Window
The main display window is automatically opened at
start up. If it is closed or hidden, it may be brought back to the
front by selecting the tools
menu, display...
option from the main menu.
The controls for the main display
are located in a separate window, the display control
panel. Although the main display window and the
display control panel are physically separate, they
behave as a single unit. The display control panel
is automatically opened at start up. If it is closed or hidden,
it may be brought back to the front by selecting the tools option, display control...
sub-option from the main
menu.
Single-clicking on a point within the main image sets the cursor
to that location. The row, column and pixel value of the cursor
location is displayed in the Current Pixel box. The
cursor may be moved by a single pixel value in any direction by
pressing the arrow keys which are also in the Current
Pixel box. (The keyboard arrow keys have no effect.) The
current pixel also determines which row or column is displayed in
the plot window. The
current pixel in the main display window, in the zoom window, and in the
values window are
the same point. (This is not true for releases before 2.07.) You
may change the current position by entering values in the X and Y
coordinate boxes; however, if you don't type a carriage return when
you are done, nothing will happen.
Double-clicking on a point within the image display will update the zoom window and the values window to display the
region around the cursor. (Note that the cursor is shared between the
main display window, the zoom window, and the values window.)
Special Features
Files can be displayed by entering the file name in the Load
File box. Only files written by this program are guaranteed to
be read in. Other FITS format files may not be readable.
The Display Limits box is used to set the region of the
ccd that appears in the main display. The default value is to show the
entire ccd.
The stretch box controls the look-up table that is used
to display the data. The program will display all pixel values between
the specified limits as shades of gray, varying from black to white.
Note that by depending on the order of the limits, it is possible to
get either black-on-white or white-on-black. You must press the
stretch button in order for the values that you have
entered to have any effect. (In earlier versions of this program it
was also necessary to enter a carriage return after entering each
numeric value; this is no longer necessary.) If you press the Zoom str. button, the stretch will be
applied to the zoom
window.
The Test1 and Test2 buttons display test
patterns. They are for the use of the programmers and are of little or
no use to the normal user.
The spec button starts the
spectroscopy tool. See the manual section that covers the
spectroscopy tool for more information.
The phot button starts the
photometry tool. See the manual section that covers the photometry
tool for more information.
The clear button will clear the display.
The print button will print the main display. Note:
Unless you are working with a small region of the actual ccd, you
should not use this button. It takes several minutes to process the
entire image for printing, and it takes a very long time to print.
Unless you are working with a very small sub-frame, you should find
another way to print the entire file. You may print a smaller region
using the print button in the zoom window
(This will be corrected in the future.) Note that the main menu
print command is much faster than this button but gives
somewhat poorer image quality.
The Flip Axis check-box inverts the orientation
of the CCD display.
The Auto Clear check-box causes the the screen to
be cleared before a new image is displayed.
The Auto Update check-box
(enabled by default) causes the zoom window, the plot window, and the values window to be
updated automatically, whenever a new image is displayed. Disabling
this feature causes readout to go slightly faster. Disabling this feature will not
have a significant effect unless you are in loop mode with a very
short exposure time, not saving data to disk, and using a very
small subframe.
This document was written by Hubert Yamada (yamada@ifa.hawaii.edu) and Kevin Jim (kjim@terrasys.com).
