Advanced Colour Science

The Advanced Technology behind Light Illusion's colour science

Light Illusion's colour management systems have been developed around the most advanced colour mathematics engine used within any colour system currently available. As such, all Light Illusion systems operate in a totally unique way, providing final results that far exceed those of alternate systems, combined with far greater tools, options, and capabilities.

LightSpace CMS 3D LUT Definition

3D LUT Accuracy

Traditionally, 17^3 cubes have been the mainstay for LUT operation, but historical testing has proven that to be less than ideal for the level of accuracy required for today's calibration, as well as more creative LUT workflows. Looking at the cube image shown here it is simple to see that the larger 21^3 cube data to the right has a far greater level of granularity that the 17^3 data to the left, and therefore far greater accuracy.

Note: This is profiling accuracy, not calibration accuracy, as the generated calibration LUTs are often of larger size.

Internally, LightSpace CMS works to a far greater greater level of granularity, further improving the accuracy of any final LUT generated, and is also not limited to grid based data sets enabling users to define their own profiling sequences using any approach they choose.

There is no substitute for hight granularity when it comes to accuracy of display profiling, and hence final calibration.

The advanced level of accuracy provided by LightSpace CMS has lead many of the world's leading display manufacturers to partner with Light Illusion for display calibration, including Konvision, Osee, TVLogic, Flanders Scientific, Eizo, Dolby, Bon, SmallHD, Convergent Design, NEC, and many more.

Advanced Mathematical Profiling

Convert Colour Space

As LightSpace CMS performs all its calibrations with a true mathematical based colour engine, without the need for a guesswork based approach, the cube data generated is a direct profile (or colour map) of the display being calibrated, with no virtualisation, iterative re-reads, or need to re-verify measured points during profiling.

LightSpace is a true single pass closed-loop profiling system, with the ability to generate multiple target colour space calibrations from a single profile pass.

Alternative calibration systems that do not have access to advanced colour engine mathematics are forced to link profiling directly with the single final calibration. The problem with this approach is the need to use guesswork during each stage of the calibration process, with obvious inaccurate results, combined with the need to re-profile for each and every target colour space.

The latest release of LightSpace CMS has added new Fit Space and Map Space options for LUT generation, which use new and totally unique Colour Engine Algorithms for the calculation of the calibration LUT from profile data.

New

The results of these new Colour Engine Algorithms are far superior results to any alternative calibration systems, and are especially superior for displays that have a gamut that is significantly lower than the target colour space, or for displays that prove difficult to calibrate via the alternative Peak Chroma or Peak Luma options with LightSpace CMS, due to being particularly poor displays, with very irregular response to input stimulus change.


Total Image Chain Calibration

As LightSpace CMS can be used in closed-loop calibration mode, or Display Independent Profiling (DIP) mode (both fully automated), it can uniquely calibrate not just the display, but the full image chain to be used for viewing - critical in Home Theatre environments, where the DVD/Blu-ray player is a key component in the image chain, and often outputs a signal that is not 'perfect', and so also requires 'calibration' for complete final accuracy.

DIP Profiling

Calibration system that link profiling to the final calibration, using guesswork based iterative feedback loops cannot perform such DIP based calibrations.

For more information on LightSpace CMS disc based DIP calibration see Ted's fantastic LightSpace CMS Calibration Disc at www.displaycalibrations.com.


Open Profile Patch Sets

Colour Patches

Very uniquely, LightSpace CMS is not restricted to simple grid based patch-set for profiling, and users can define their own profiling sequences using any approach they choose, using the tools available at displaycalibrationtools.com, or the optimised patch sets available to download from Optimised Patch Sequences.

Such sequences can give very high levels of final accuracy, with far smaller patch sets, so in far quicker time scales - ideal for users with slower probes, such as the X-Rite i1 Display Pro, again without the need to guess where patches should be positioned within volumetric space, with a high level of final granularity, far higher than that available via guesswork approach based calibration systems.

Note: granularity is the ONLY 'value' to impact final calibration accuracy - using 10bit colour values vs. 8bit colour values has no impact on calibration accuracy - such assertions are pure marketing hype


High Volumetric Accuracy, with High Granularity

Display Profile Accuracy

Using a patch sequence that covers the whole volumetric colour space with a high level of granularity means that the acquired data-set is capable of dealing with any issues that a given display may be suffering, including any non-linear display errors, white point and grey scale tracking errors, RGB crosstalk and separation errors, colour gamut errors, including poor display non-linearity, which other 3D LUT systems can fail badly with due to excessively poor volumetric measurement coverage (granularity).

Having access to the full profile data in its raw form means the calibration system can assess exactly what impact on the output colour each and every colour point has, enabling all display errors to be directly addressed when generating the final calibration LUT. Using a guesswork approach, with iterative or dynamic adjustments made during measurement, means you are making changes on a single point, by single point basis - with limited ability to really understand such display issues, without repeatedly going back to check (and re-adjust) previous calibration changes over and over again.


Unrivaled Speed for Unrivaled Accuracy

Speed and Accuracy

As LightSpace CMS only reads every point once it is the fastest calibration system on the market. It can read many thousands of individual colours in the same time it takes alternative systems to read a few hundred different colours.

Even with iterative or dynamic adjustments made during measurement, to attempt to overcome the limited number of colours measured, the results of measuring a greater set of discrete colours will always generate better overall volumetric accuracy, especially on displays that suffer poor non-linearity issues, as the only way to accurately overcome them is with high volumetric measurements - which requires the high profiling speed that can only be provided via calibration systems that read each colour point just once.


Pre-set and Unique Parametric Gamma Control

LightSpace CMS can calibrate to any given colour space, with any target Gamma, including all 'standards', such as Rec709, BT1886, P3, etc, all without the need to define your required target before profiling, enabling you to interactively try different results.

Parametric Gamma

Additionally, the ability for LightSpace to work with user defined Parametric Gamma values is unique, and enables users to set their own intricate target Gamma values, allowing, for example, advanced control of display blacks, which is very useful when needing to overcome less than ideal viewing conditions.

For an example of Parametric Gamma see the Parametric Gamma page of the website.


No Unnecessary Additional Processing

Display Volumetric Profile

Generating a true profile data-set of the underlying display parameters, totally separately to the actual calibration, enables far more accuracy, combined with a large range of options associated to final calibration, LUT manipulation, Look and colour management, and more.

Having a true, unadulterated measurement data-set, generated from the display with a high level of granularity, means there is no need to apply unnecessary third stage data manipulations, as the total volumetric colour space has been assessed to a level beyond the need for such separate adjustments. Using such separate adjustments tends to improve just the area of focus, at the expense of overall levels of calibration. And for accurate final calibration, every colour point in the volumetric space MUST be considered equal, not just grey scale or primary colour groups.

A classic understanding of this is skin-tone - as it is neither associated with grey-scale nor primary colours, but human visual acuity is quick to spot poor skin-tone accuracy.


Advanced Filters - Only When Needed

LUT Filtering

Depending on the version, LightSpace CMS includes a range of LUT manipulation and effects tools, ideal when generating Looks, rather than when performing calibration.

When performing 'calibration', the only time any filters would be needed is when the probe in use struggles to read valid data, specifically within the blacks. Unlike other calibration systems the LightSpace profile data-set is true to the actual measured data, and doesn't 'clip readings' below 10% or 20%... which is very important if you are to really understand the underlying display capabilities, and to prevent 'shadow' issued when actually calibrating, as is often the case with alternative systems.

Therefore, when the probe does report invalid data a filter may be needed to 'normalise' the readings, after the calibration LUT has been generated. There is NEVER a need to use such filters for display non-linearity, or similar, corrections, as such corrections are always handled automatically within LightSpace!

When calibrating displays there is virtually never a need to use any of the available filters, as probe errors are automatically handled within LightSpace when generating the calibration LUT from the measured profile data.


Film Emulation - The Most Difficult Calibration

Film Emulation

Very uniquely, the internal colour management engine within LightSpace CMS has been developed to generate the most accurate possible film emulation LUTs, traditionally used within Digital Intermediate grading operation to perfectly match the digital display to the final film projected images.

This capability shows just how good LightSpace CMS really is, because 'film' is the most non-linear, poor decoupling (crosstalk), poor tracking, and generally messed-up colour space imaginable. As a consequence, few calibration system have what it takes to accurately generate true Film Emulation LUTs that accurately match the final projected film image.

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