It is helpful for me to be able to show targets and actual measured points when displaying a saturation sweep in a cie diagram.

Is there a way to enable that in ColourSpace?

Attachments illustrate the difference.

Sweep with both measured points and their tagets

ColourSpace only shows the measured points?

nathan

You can see how far from target a measurement is relative to the targeted gamut on the CIE chart by enabling the Tangents and/or Targets overlay in the graph options:

As it states in the user manual:

The Tangent tick box enable Tangent lines to be displayed on the CIE graphs, which show the errors associated with any given point (where the point measurement should have been, compared to where it actually is).

When a single point is selected, all other Tangent lines will be dimmed. Setting a colour patch that has not been measured will make all Tangent lines bright.
Hint: Move one of the Manual Measure sliders by one value...

The Targets tick box swaps the points to display where the measurements should, and colour-codes them to their actual colour. The Tangent lines will also work in reverse.

As above, the Tangents option is far more accurate than the generic boxes Calman uses.
And even better, they work in the 3D graphs, so you can see if the error is gamut or brightness, or a combination of both.
https://lightillusion.com/advanced_operation.html#graphs

Steve

Excellent. Thanks for pointing me to the details in the manual. For some reason "tangent" wasn't registering in my head as a way to characterize the error, but that makes sense now that you point it out.

So, for these two CIE charts with Tangents enabled, I see a nice visual representation of errors (deviations from standard).

But I have obviously only measured (characterized) the edges of the gamut. I think I chose "Grey Primary & Secondary Ramp +" as my measurement set and assume that is why.

Which of these characterization choices would show me (for example) not just 100% saturation points but 25, 50 and 75% as well, in, for example, the xy CIE chart? The closest I see are the 75% gamut sweep options. Perhaps I need to use the custom option? Are there examples of creating that custom set of measurement point choices? or perhaps there is a collection of .csv files with some of the popular or more common sets (presumably that were not common enough to end up in the official drop down list of choices)? I see such mentioned on https://lightillusion.com/advanced_operation.html#csv as being here (https://lightillusion.com/software/home.php) but don't see them there so I'm guessing I need to fill out the request form (which I have just done).

Cube Based
Grey Ramp RGB
Grey Ramp RGBCMY +
Grey Ramp RGB Large
Grey Ramp RGBCMY Large +
Grey & Primary Ramp
Grey Primary & Secondary Ramp +
Memory Colours RGB
Memory Colours RGBCMY
Gamut Sweep 75% Primary
Gamut Sweep 75% Primary & Secondary
Gamut Sweep 100% Primary
Gamut Sweep 100% Primary & Secondary
Edge Sweep

nathan
Ted provides the types of patchsets you're referring to (saturation sweeps, colorchecker sequences, 5/10% grayscale sequences, etc.) with his version of PGenerator:



Edit: Just to clarify, those patch sets are for Rec 709 evaluation / manual calibration.