IDP3 Show Images Window

This widget allows you to control certain aspects about each image individually.

These choices will be applied to all images,whether or not they are turned on. The options include:

On
OFF
MaskON
Set all image masks ON (if loaded)
MaskOFF
Set all image masks OFF
Flip Y
Flips the images about the x-axis (from top to bottom). Handy for aligning HDF and fits images.
Add
Subtract
Ave(rage)
This divides the added values at a given location by the number of images that are turned on, even in areas that do not have overlapped images. To average "correctly" you can do a Sigma Clip Mean/Median (from Main Window/Images/Sigma Clip) and save to a new fits file.
Min(imize)
All images set to Min will select the minimum of the current image display and the current image.
Positive
Sets all negative pixels to zero.
ABS(Negative)
Sets all positive pixels to zero and all negative pixels are made positive with absolute value. (This will crash the program if you don't have any negative values.)
Resample
This allows zooming on images that make up the current display. For an individual image, the resample factor is displayed in the Adjust Position Widget.
Pad
Will ask you for how many pixels to add around each of the images.
Rm Pad
Removes the pads by setting the pad value to zero for all images.

This button gives you the option to suppress updating the main display until it is unselected again. It is a very handy time saving device.

At any given time, only a single image in the work area may be adjusted. The user chooses which image this is using the 'Select Image' entry under the 'Image' menu on the main widget's menu bar. Alternatively, the 'Reference' image may be selected by clicking on it's name in the 'Show Images' window. Underneath the list of function buttons is the name of the current reference image. The number of the image in the list is also included since a single image may be loaded multiple times into IDP3. An "*" denotes the reference image in the list of names. It is now the image that moves if you are using Adjust Position and the image that has the other images added, etc. to it during the idp3 session.

Below the label of the reference image name is a scrollable list of images that are loaded. Each image has a line of functions in the list. Clicking on the image name causes the reference image to move to that image. On, MaskOn, and Flip Y are radio buttons to select these functions. The image disposition button is a menu of the possibilities including those listed above for All images and the following:

NOTE: The main display image is the result of the user specified stack operations with its initial value = 0. Images are processed in the order they appear in the Show Images Window. Therefore, the operation on the first image can be add, subtract, average, compute the positive image, or take the absolute value of a negative image. All other operations require an image previously in the stack in order to work properly.

To open a new widget that displays the header information for an image press th e Hdr button on the same line as the image name. This widget has the "Find Keyword" fuction that will locate a word in the header. Simply type the keyword and hit Search

This button will open a widget that displays the current centroid solution (with associated right ascension and declination) for the current image.

If the file names are long, the window might not be large enough to display all of the buttons. You can change the size of the window by changing the X and Y values of Size Show Images on the widget File/Edit Preferences on the Main Display Window.