A LUT or Look Up Table is a table that transforms the color response and as such adjusts the ‘Look’ of the input. 3D LUTs have a combination of three inputs defining the combination of Red, Green and Blue values allowing for adjustment of not only color but also gamma and gamut. LUTs can also be used to monitor the input in a specific color space or more creatively to create a specific ‘look’ such as film stock emulation or to match cameras.
For the Shogun/Assassin/Flame/Inferno series, Atomos support 3D LUTs in the industry standard .CUBE format and provides 8 LUT memory slots. To import the LUTs into your unit first copy the .CUBE files onto the SSD/HDD and load the drive into the Atomos unit. Select the yellow Monitor icon in the lower right hand corner of the home screen and then press the blue file icon to select LUTs from the drive. This LUT can then be applied to the display by selecting the correct LUT memory slot. In addition to previewing a "look" using the loaded LUT it is possible to use the LUT in three additional modes;
1) REC LOOK; Rather than previewing a look, selecting this option will bake the LUT permanently into the recording as a non-reversible process. As it cannot be undone in Post it is advised to consider your workflow carefully before the use of this option. When enabled, a CUSTOM LOOK icon will flash in the top corner of the monitor and the REVIEW LOOK cannot be activated during recording to avoid any potential issues with the recorded content.
2) OUTPUT LOOK; With this option the selected LUT is also applied to both the SDI and HDMI loop outputs. This will allow for review on a larger monitor or to be used with a wireless sender. This function can also be combined with the down convert option that can be found in the input menu.
3) REVIEW LOOK – During color management it’s likely that you may want to review a number of LUTs and even compare them to the Native Video Source. Tapping the REVIEW LOOK option will apply a 50/50 vertical screen split that will show both the Natural Source Video and the selected LOOK of the LUT. Please note that activating the 50/50 preview will also be applied to the Loop out.