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3D LUT Types

An overview of the types of 3D LUT’s Calman can generate

Calman provides multiple display profiling algorithms, Intelligent Resolution Profiling (IRP), Lightning LUT, and Matrix LUT for profiling a display’s color rendering performance and creating a corrective 3D LUT.

Intelligent Resolution Profiling (IRP)

The Intelligent Resolution Profiling algorithm is Calman’s highest quality method of creating 3D LUT display correction data. If you have from one to four hours available to run a 2000 to 3000 point display profile, the IR Profile process is your best choice for producing accurate 3D LUT correction data.

Every display has some nonlinearity, and IRP is the best 3D LUT process available for correcting nonlinearity. The IRP algorithm, which incorporates proven Dynamic Linearity Correction (DLC) technology, produces more accurate results, with a more efficient process, with a user-friendly process.

The IRP algorithm uses DLC to analyze the display linearity with a small profile of color sample points, then runs a heuristic analysis to evaluate the degree of linearity error that can be corrected within the selected time or with the selected number of measurement points. The IRP algorithm then measures predetermined and DLC-determined color points, develops correction data to the selected calibration standard, and interpolates the correction data out to the desired number of final 3D LUT points. The final display calibration LUT has the highest accuracy possible within the selected time or points limit, for incredible accuracy with any RGB or video display.

IRP provides maximum correction for gamma, grayscale balance, RGB crosstalk, and color gamut, plus it corrects luminance and saturation nonlinearities to the maximum extent possible within the selected time or points limit.

IR Profile (time-based)

The IR Profile (time-based) Calibration Type is the default display profiling process, which is your best and most user-friendly choice to calibrate most displays. This calibration type uses Intelligent Resolution Profiling to search out the most nonlinear color space areas and correct those first. It then creates the best quality display calibration 3D LUT possible within the selected period of time.

IR Profile (point based)

The IR Profile (point based) Calibration Type is an alternate IRP process that allows you to limit the display profile by the number of profiled color points, rather than by the total measurement time.

The IR Profile (point based) calibration type uses Intelligent Resolution Profiling to search out the most nonlinear color space areas and correct those first. It then creates the best quality display calibration 3D LUT possible by profiling the selected number of color points.

Lightning LUT

If you don’t have the time for the full linearity correction of an IR Profile and need a 3D calibration LUT very quickly, run Lightning LUT, to check whether it is appropriate for the display being calibrated. The revolutionary Lightning LUT process in Calman produces a high-quality display calibration LUT for most professional displays with at least moderate color space linearity, usually in five minutes or less.

With just 65 to 75 RGBW luminance ramp measurements, Lightning LUT produces a display calibration 3D LUT that rivals the accuracy of Calman’s previous 2,000 point DLC calibration, for displays with moderate linearity. An innovative conversion matrix algorithm exploits the full significance of the data at adjacent color points to deliver a very high-quality result on most professional displays.

Lightning LUT corrects gamma, grayscale balance, RGB crosstalk, moderate saturation, and luminance nonlinearities, and reduces a large gamut volume to a smaller target volume.

However, displays with significant saturation or luminance nonlinearity may produce marginal results with Lightning LUT. Be sure to perform the Advanced Linearity validation step in the Color Cube workflow after creating a Lightning LUT to check for high errors due to display nonlinearity.

Displays with significant nonlinearity can be accurately profiled with one of the Intelligent Resolution Profiling processes.

Matrix LUT

Creates a 3D LUT using 3×3 Matrix math by reading just five color patches. This method takes less than 30 seconds. The resulting accuracy is equivalent to the results of a normal CMS calibration but much faster.

Tags:  3D LUT