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Truelight

Truelight is a color management system that lets you preview the final look of the film on your computer display. The preview is based on calibration data for film recorders, projection systems, and monitors.

This technology is licensed from FilmLight, who also offer additional tools for display calibration and profile generation.

Inputs and Controls

Connection Type	Connection Name	Function
Input	unnamed	The image sequence to view through Truelight.

Control (UI)	Knob (Scripting)	Default Value	Function
Truelight Tab
channels	channels	rgb	The Truelight color management is only applied to these channels.
raw log input	input_is_log	disabled	When enabled, the image is converted from Log to Linear before the input is sent to Truelight. Enable this control if you are feeding log images into this node, otherwise the input image is assumed to be linear.
raw Truelight output	output_raw	enabled	When enabled, the conversion of the Truelight output back to linear color space is not performed. Truelight is typically used to generate images in display (monitor) color space, in which case, this should be active. If it is turned off, the output is linearized using an inverse sRGB LUT. If you are using Truelight as a Viewer Input Process, you generally want to send its output directly to the screen with no further LUT conversion, so activate this and set the Viewer LUT to Linear so that the Viewer does no further conversion. If you want to write the Truelight output directly to a file, activate this and set your Write node color space to Linear to prevent it converting input from Linear to another color space.
profile	profile	Dependent on platform	Sets the file path from which Truelight commands are read. The results of the commands are stored in the saved Nuke script.
reload	reload	N/A	Click to read the specified Truelight command file again and reset all controls.
display	display	monitor	Sets the display type to use when the $TRUELIGHT_DISPLAY environment viable is disabled.
enable	enable_display	disabled	When enabled, use the display control to set the display type to use. When disabled, the $TRUELIGHT_DISPLAY environment variable is used instead of manually setting the display type.
display file	display_file	Dependent on platform	Sets the file path from which the display calibration files are read.
gamut alarm	gamut_alarm	disabled	When enabled, out-of-gamut colors are left saturated and in-gamut are monochrome.
invert	invert	disabled	When enabled, apply a reversed Truelight color correction which can be useful for converting video to a film-like colorspace.
Advanced Tab
enable	advanced	disabled	When enabled, the advanced controls are activated.
reset	reset	N/A	Click to reset the advanced controls to the settings defined in the specified profile.
show commands	show commands	N/A	Click to display a window containing the current commands to write to the Nuke script.
recorder	recorder	(from profile)	Sets the type of recorder to simulate or uses the setting defined in the specified profile.
print	print	(from profile)	Sets the type of print to simulate or uses the setting defined in the specified profile.
lamp	lamp	internal_Xenon	Sets the type of lamp to simulate or uses the setting defined in the specified profile.
printer points rgb	printer_points	0, 0, 0
greyStatusA rgb	greyStatusA	Dependent on profile
brightness	brightness	1	Sets the brightness of the image in the Viewer.
flare correction	flare_correction	0.01	Compensates for ambient light shining on your monitor (measured as a fraction of display white).
white Y	white_Y	16	Sets the brightness of the simulated projector lamp.
white u	white_u	0.1978	Sets the color of the simulated projector lamp on the u axis.
white v	white_v	0.46830001	Sets the color of the simulated projector lamp on the v axis.