| iTool User's Guide: Working with Volumes |

## iVolume Tool Operations

Many operations are available in the iVolume tool. Once you have visualized your volume data, you can scale and filter as well as creating a histogram or viewing statistics for your volume. The following operations are available for volumes.

### Viewing a Histogram

A density histogram is a plot consisting of either horizontal or vertical bars. The widths or heights of these bars represent data values. Another type of histogram is a style plot histogram which plots different data sets side-by-side using differently styled points or bars to represent the data. To view a density histogram of volume data, use the iTool's histogram feature by selecting Operations Histogram. For information on histogram creation, see Plotting a Histogram.

### Viewing Statistics

To view statistics for volume data, use the iTool's statistics feature by selecting Operations Statistics. For information on viewing statistics, see Displaying Statistics.

### Smoothing a Volume

Within the iVolume tool, plots can also be smoothed to soften edges or compensate for random noise in the volume.

To apply the smooth filter to a volume:

1. Select the volume.

2. Select Operations Filter Smooth.

### Opening an Image Stack

iVolume allows you to open a group of images as an image stack within the tool. To open images as an image stack select File Open Image Stack... From the dialog, select the images you wish to open using either Shift + right click if images are consecutive or Ctrl + right click if nonconsecutive.

Note Images are opened and stacked in the order they are named and not in the order of selection. In other words file names are opened alphanumerically. The only way to control the order of opening files is through the naming or renaming of files.

IDL Online Help (March 01, 2006)