SMART IDP3 FITS File Viewer

IDP3, an IDL-based interactive astromonical image analysis package, may be used alongside the SMART package.
It was developed by the NICMOS group at the University of Arizona.
The MIPS group at the University of Arizona have kindly allowed a link to their IDP3 help page which includes full operating instructions.

(The SMART team expresses thanks for this here.)

There are two ways to invoke IDP3 while SMART is running :

• 1. Type "idp3" at the "IDL>" command prompt.
• 2. Use the "Start IDP3" option on the Project Manager "Tools" menu.
• 3. Use the "IDP3" option on the Project Manager "Dataset" window "View" menu.

Image Arithmetic in SMART IDP3 FITS File Viewer

The following notes about image arithmetic have been supplied by Bettie Stobie (one of the original developers of IDP3).

Image arithmetic is limited to the disposition operations you see for each image in the show images widget.
The main image display starts off blank and each image that is turned on interacts with the image display according to its disposition.
The current image dispositions are add, subtract, divide, invert, average, multiply, min, pos, neg, and absolute value.
If you wanted to subtract one image from another you would set the disposition of one to add and the other to subtract.
The images are processed serially so it doesn't matter what the order of the images are in the list for this operation.
If the image to be subtracted is first in the showimages list it is subtracted from a blank image and the second image is added to that result.
If you want to multiply two images the first image to be processed must not have the disposition of multiply because it would be multiplied by an empty display image of with a null result.
A short description of these dispositions :

Add :	Add this image to the image display.
Subtract :	Subtract this image from the image display.
Divide :	Divide this image into the image display.
Invert :	Compute 1/image and add to the image display.

|Average : |This is a special function that searchs how many images that are on have the disposition of AVE.
Each image whose disposition is AVE is divided by this number and added to the image display.
A peculiar way to average data but it fits the idp3 paridigm for a quick look.
For a more rigorous combination of images use the "imcombine" function in the images menu. |

Multiply :

Multiply the image display by this image.

|Min : |Set image display to minimum of this image and the image display.
This is good for a quick attempt at removing cosmic rays. | |Pos : |Set all negative pixels in image to 0 and add image to the image display. | | Neg : |Set all positive pixels to 0 and negative pixels to absolute value and add to the image display. |

Abs :

Add absolute value of current image to image display.

Each time you select some function for idp3 the display routine will check which input images are on
and build and display the display image by combining the input images as you have specified.
If you drag out a region in the main display with the cursor an ROI will pop up from which you can do statistics, radial profile, cross section, etc.
All of this will be done on the subsection of the display image that was calculated above.
If you want to save the display image or its subsection (ROI) you can save them to disk as fits files.