Using the Iris Image Processor

Command	Description
Loading An Image (File, Load, Browse for image)	Load any of various file types are viewable with Iris.
Viewing information about the image (File, Image info)	FITS header information
Setting max and min for threshold (fourth button from right on toolbar, the one that looks like two sliders)	To obtain a nicer looking image, set the max and min for the threshold window.
	A good strategy for setting the max and min counts for the threshold is to run the cursor over the image and observe the counts in the status bar (labeled ‘I’ in status bar located in lower right of window). Set one of the sliders to a value near the lowest value you observed and set the other slider the highest counts you observed.
Inverting the color palette (threshold button)	The threshold window has other functions as well. The last button (the square one made of a white triangle and a black triangle) inverts the colors. For example, if you have the image set to a black/white color scheme, after clicking on the button, white will represent the lowest range of counts and black will appear for the highest range. Click again to return to the original setting.
Artificial Color Schemes (threshold button)	The first three buttons in the threshold window are different color schemes to view the image in. Black/White is default. 2 other artificial coloring options are available.
	The look of your image can be changed by using log scaling instead of a linear scale.
Flipping, Rotating, Shifting the image (select Geometry, and then the desired function)	Your image can be manipulating by rotating, shifting, or flipping.
Zooming in/out	To zoom in on your image use the two buttons right of the threshold bar button in your toolbar. The third button tells you how far you have zoomed in or out. An alternate approach, is to select resample under Geometry and choose the factor by which you would like to increase or decrease the size of the window.
Slice (select View, then click on slice command)	Slice is a function that allows you to find the distance between two points on the image in pixels. To use the slice function select it under view and then click the cursor on one endpoint of the distance you want to measure and hold down the mouse button while dragging the cursor the other endpoint. A window will pop up with a graph in it. Place your cursor somewhere on the actual curve in the graph. Click and drag the mouse along the curve. The pixel distance from the first endpoint to the place on the image represented by where your cursor is on the curve is shown in a status bar on the bottom of the popup window.
Subtract and Multiply (select Processing, then choose desired command)	A practical application of the subtract and multiply commands is to find a supernova when given two images of the same region. To find a supernova with these commands you would first scale the two images. To do this, you would slice two objects and find the pixel distance between the peak counts of each object for each image. Then you resample one image with x and y factors of the ratio of the pixel distance of the other image to the pixel distance of the current image. This resizes the current image to the scale of the other.