Potential Calibration Issues
Spotting and understanding errors with profiling/calibration workflows.
User Guides
Active LUT vs LUT Upload
Variations between Active LUT & LUT Upload
Active LUT vs LUT Upload
Active LUT vs LUT Upload verification, direct HDMI profiling, LUT size mismatch, video scale before upload, Active LUT bit depth setting, why verification results differ from uploaded LUT
Autocal Issues
What's wrong with Autocal?
Autocal Issues
why Autocal does not work well, Autocal is guesstimation not 3D LUT, iterative adjustment errors, ABL ASBL heat drift, adjustment point misalignment, Calman Autocal Sony 20-point error, manual calibration vs Autocal accuracy
BT1886 Issues
Issues with BT1886 calibration
BT1886 Issues
BT1886 flawed concept, lifted near black shadows, washed out shadow detail, BT1886 vs Rec709 2.4 power law, BT1886 EOTF differential gamma plot
Grey Scale issues
LUT Calibration grey scale issues
Grey Scale Issues
why calibrated grey scale looks wrong, invalid profile data causes LUT errors, Peak Chroma vs Hybrid LUT processing comparison, probe accuracy affecting grey scale, Focused Patch Set for grey scale, Reduced Gamut Patch Set
HDR Volumetric Accuracy
Issues with HDR volumetric accuracy
HDR Volumetric Accuracy
self-profile display comparison, WOLED white pixel gamut reduction, dE tangent line 3D CIE graphs, LCD vs WOLED HDR volumetric accuracy, RGB separation clipping at high brightness, WOLED cannot be accurately calibrated for HDR
LUT Processing
Issues with different LUT Processing
LUT Processing
poor LUT processing within display or LUT box, BMD HDLink Pro LUT distortion example, Active LUT vs Uploaded LUT comparison graphs, manufacturer image processing distorting LUT, LUT concatenation workaround
Pre-Calibration
Issues with Pre-Calibrated displays
Pre-Calibration
displays with internal calibration that cannot be disabled, JVC projector wide gamut mode issue, gamut drop-off mapping multiple colours to one output, Reduced Gamut Patch Set, Focused Patch Set, Sub-Space for pre-calibrated displays
Post Calibration Accuracy
Accuracy issues post calibration
Post Calibration Accuracy
is the display really accurate after calibration, Drift and Stabilisation compensation options, thermal instability after calibration, black frame cooling patches, grading environment caution with Stabilisation Patches
Post Calibration Adjustments
Display Adjustments Post Calibration
Post Calibration Adjustments
manual controls after 3D LUT break calibration, 1D LUT pre and post 3D LUT signal chain, adjusting brightness contrast gain after calibration, why post-LUT adjustments still break calibration
Probe Accuracy
Calibration issues with inaccurate probes
Probe Accuracy
inaccurate probe causes inaccurate calibration and verification, polarisation errors on displays, i1D3 correlation file accuracy, SPD2Matrix reference probe match, probe matching to a spectro, wide gamut display probe accuracy
Signal Processing
Issues with signal processing
Signal Processing
internal TPG signal path distortion, external TPG bypasses signal processing errors, LUT position before or after video processing electronics, skin tone triplet distortion example
Signal Range
Input signal range issues
Signal Range
TV Legal vs Data vs Extended range mismatch, Patch Scale setting errors, grey scale compression and stretching from range mismatch, black lifted or white reduced from wrong signal range
Test Patch Processing
Issues with inaccurate patches
Test Patch Processing
display internal TPG not bit-accurate, Chromecast Shield FireStick Apple TV software TPG accuracy, LightSpace Connect vs Calman VirtualForge accuracy, YCbCr to RGB conversion errors, internal vs external TPG comparison
Volumetric Errors
Volumetric calibration issues
Volumetric Errors
what volumetric means in display calibration, why a 3x3 matrix cannot correct in-between colour errors, self-profiling a display to its own extracted colour space, 3D CIE and RGB separation error graphs