TAKE CONTROL OF YOUR COLOUR...

One of the biggest problems with any display device is how to check that it is actually capable of displaying the colour gamut (colour range) and gamma (grey scale ramp) that the manufacturers say it does....

LightSpace CMS provides two different ways to show the underlying set-up of displays.

The most obvious is to use the Quick Profile function, which will show the measured gamut and gamma compared to the target selected. This is very straight forward, and provide profile measurement displays as follows for gamut and gamma.

An alternative, and one of the most accurate ways, is to use full 3D characterisation to show the accuracy of any profiled display.

The concept is very simple to understand and implement.

First, if required, use the LightSpace CMS Calibration Interface and probe to manually set-up the monitor as accurately as possible.

Then to check the display for accuracy perform a 'profile' using as large a selection of flats (cube size) as needed - the more used the better the final accuracy.

When the characterisation is complete, go to the 'manage Colour Spaces' menu, and use the Display button to open a new window showing the profile data as Gamut and Gamma graphs.

The 'Display' capability allows any display profile to be seen as Gamut and Gamma graphs, showing the actual data measurements plotted against any colour space preset (including saved user pre-sets).

This display capability shows the underlying projector or monitor gamut and gamma, helping understand what future calibration will be capable of.

For example, the above gamut show a monitor profile matched to P3-D65 colour space, and blue and green are specifically out of gamut, and therefore no LUT or claibration will ever bring this back into gamut.

An alternative is to use the Colour Space Conversion tool to make a LUT that takes the image's expected colour space and converts it to be accurate on the display's measured colour space - so, if the image should be seen in Rec709, set the Convert Colour Space to have Source as Rec709, and Destination as the display measured profile.

The resulting LUT will show any calibration errors - if the calibration is perfect the LUT will be a unity LUT with no variation... The following gamma ramp shows that the gamma for the above profile comparison to true Rec709 is accurate

But, the following cube image shows that the actual colour space of the profiled display is not totally accurate to the target Rec709. If it were accurate the cube would be fully uniform!

For any questions, please e-mail steve@lightillusion.com.