index transform file (*.itr)

Index transform (ITR) files are used to map colours to data values. Colour table (TBL) files simply contain colour values, whereas ITR files contain colours and mapping numbers. ITR files instruct the system to map a certain range of values to a specific colour.

Using the Colour Tool, you can save a customized ITR file or load previously created files. The tool enables you to save a particular colour zoning scheme you have created, load a saved zoning scheme, or restore the default scheme. For instance, if you manipulate the colour palette interactively, you can save your new palette scheme to an ITR file. Similarly, if you define divisions manually based on percentiles, you can save this new scheme for future use.