In FIV, a mode is a set of parameters that describe how an image will be loaded and displayed. These parameters include cropping dimensions, functional thresholds, default structural images, and more. Default modes for each of the typical image spaces (111, 222, and 333) are already included in FIV. Unless you specify otherwise, the appropriate default mode will be used when you load an image.
To create your own modes or customize the default modes, click on the button. A dialog will appear that includes tabs for each of the default and custom modes. Within each tab you’ll see all of the parameters that can be adjusted for each mode (some options in the default modes are not editable.) You’ll also see a button to add a new mode. Feel free to add as many modes as you find useful. Mode information is stored in a file called ‘fiv.prefs’ in your home directory and is loaded each time you start FIV.
Modes can be specified at startup using the -m command-line option (see below.) Modes can also be specified when loading images from within FIV. Simply select the desired mode from the list at the bottom of the Open File dialog.