The main toolbar

The main toolbar allows you to perform several common operations common
to the display of the image and bring up other image windows.
It
consists, from left to right, of:
The W icon
stands for Windows and clicking on it will list all possible windows
that can be created. Currently, these include:
The Channel display
tells you what channel you are currently viewing (Color in the above
picture).
The Gain
control allows you to change the display gain of the image being
displayed.
The F-Stop
control is another
way to control gain. It works in F-Stops, which is a common method used
in photography and film to adjust a camera exposure.
The Normalization
button allows
you to normalize the image within the 0 and 1 range. Its most
common use is for properly viewing Z-Depth channels or shadow maps.
The Gamma
control allows you to modify the display gamma.
The Field
control allows you to display the image as a full frame or as video
fields.
The 1:1 button
allows you to toggle on and off a compensation for an image's pixel
ratio.
The LUT
button allows you to toggle the 3D LUT color correction for emulation
of other media on your monitor.
The main toolbar can be toggled on and off by using the F1 hotkey.