You can use FCheck to alter the view and look of a pre-rendered image or animation sequence. For example, you can adjust luminance, gamma, and saturation. FCheck has features that can be accessed through:

• command line options. See FCheck options.
• hotkeys. See FCheck hotkeys.
• using the mouse. See FCheck Mouse controls.
• toolbar buttons. See FCheck Control Bar.
• the menu interface on some platforms. File menus in Windows and Mac OS X versions let you open and save images or sequences.
• the info window on Mac OS X. It is used to apply features that are otherwise unavailable on Mac OS X. See Mac OS X.