Truelight Version 2.
Truelight Product Version: 2.1 Shake Node Document Version: 1.
Truelight Overview Shake Node Truelight Overview Truelight is a complete film colour management system for pre-visualising film images on electronic display devices. It provides a full simulation of the entire workflow from digital data to final projected image. By carefully measuring and characterising each stage in the workflow, the closest possible match between preview on the Shake monitor and the final projected film image can be achieved.
2 Truelight Licence Shake Node Truelight Licence Truelight is automatically licensed to use generic profiles. The Truelight node can be upgraded to load custom profiles if required. For further information, please refer to the Truelight support section of the FilmLight website: www.filmlight.ltd.uk/support/truelight.
Monitor Calibration Shake Node Monitor Calibration A monitor must be correctly calibrated before it can accurately reproduce images. The Truelight node provides a built in tool for the visual calibration of the Shake monitor. It is also possible to use monitor calibration files which have been created using a Truelight Monitor Probe and imported into the machine. Before calibrating the Shake monitor, it should be set up to ensure optimal performance in your current viewing environment.
4 Monitor Calibration Shake Node 3 The viewer should currently be displaying two patches side-by-side, a mid grey patch on the left and a patch composed of alternate white and black lines on the right. Select the Parameters1 tab to access the Truelight monitor calibration controls: Before adjusting any of the controls, check that the ‘useProxy’ setting in the ‘Globals’ parameter tab is set to ‘Base’, and the viewer is set to a 1:1 zoom.
Monitor Calibration Shake Node 7 Repeat the process of matching the two halves of the screen as described above and again, click on the ‘Next’ step button 8 Repeat the process a further eight times to match all ten sets of grey patches.
6 Monitor Calibration Shake Node Calibrations based on the standard Apple Cinema and CRT templates link display RGB values to absolute colours in CIE XYZ. Truelight also supports display calibrations that link display RGB values to colours relative to the display white in CIE L*a*b*. For more details on these standard colour spaces see Truelight note FL-TN-00-002 on the FilmLight website.
The Truelight Viewer Shake Node The Truelight Viewer Once the Shake monitor has been calibrated (see Monitor Calibration on page 3), a Truelight node can be added to provide an accurate preview of what the final film print will look like: 1 Select the color tool tab. 2 Click on the Truelight Viewer icon: Î A Truelight node will appear in the Node View. Insert the Truelight node into the tree at the appropriate point.
8 The Truelight Viewer Shake Node The default profile set is based on different film stocks, projected with a standard xenon lamp. Advanced users can make their own profiles using a text editor (for more details see Truelight note FL-TN-00-003 on the FilmLight website). If you require detailed simulation of your light box, projector, or specific film-out process, please contact FilmLight for information on alternative profiles and customised calibrations.
The Truelight Viewer Shake Node Viewing controls When viewing a Truelight node, the images displayed should be an accurate representation of what you would see if the image data were recorded and printed to film, then projected on the cinema screen. Ideally there should be no need to adjust anything. However, sometimes the user needs to adjust the display to compensate for ‘external’ factors not modelled within the Truelight profile.
10 The Truelight Viewer Shake Node oneDLUT - Click on this toggle button to replace the Truelight cube transform with simple look-up tables. This is slightly faster, but it is only accurate for neutral tones. When this control is enabled the 'showOutofGamut' control is hidden as it will have no effect. Expanding the ‘advanced’ section at the bottom of the panel provides access to additional controls to compensate for ambient lighting conditions.
The Truelight Viewer Shake Node Viewer LUT Truelight can also be selected as a viewer LUT. Right click on the viewer LUT control to access the parameters. Gamut alarm Some colours can be displayed on film but cannot be reproduced on a particular electronic display such as an LCD or CRT monitor. These colours are considered as ‘out-of-gamut’ for that display device. When the showOutOfGamut button is enabled, these out of gamut colours are highlighted and the colours in gamut are rendered neutral.
12 Support Information Truelight Shake Plugin Support Information Further information, support and FAQs can be found in the Truelight support section of the FilmLight website: http://www.filmlight.ltd.uk Main Office (London): FilmLight Inc.
Appendix - Colour Space Conversions Truelight Shake Plugin Appendix - Colour Space Conversions Truelight can work with data which represents images in either log, linear or video colour space. When setting up the Truelight node, it is important to choose the correct input colour space for the images you are working with (see page 8).
14 Appendix - Colour Space Conversions Truelight Shake Plugin Linear Image Data LogLin Settings: conversion = 0; /* log to lin */ rOffset = gOffset = bOffset = 0; rBlack = 95; rWhite = 685; rNGamma = 0.6; rDGamma = 1.7 rSoftClip = 0 Truelight Settings: colourSpace = “Lin”; profile = KodakVision; display = my_monitor; Video Image Data LogLin Settings: conversion = 1; /* lin to log */ rOffset = gOffset = bOffset = -8; rBlack = 95; rWhite = 685; rNGamma = 0.6; rDGamma = 0.7727; /* 1.7/2.
Truelight
Fil m Light D I G I TA L F I L M T E C H N O L O G Y
