In addition to the usual inbuilt Characterisation and Quick Profiles, and the use of user generated .csv patch sets, it is also possible to use actual profiles as patch sets.
This is especially useful with the Virtual Probe and Custom Filters.
Re-Measure Patches
The ability to select and re-measure any patch, or group of patches, within a profile is one of ColourSpace's unique features. It means any individual patch or group of patch measurements that may have measured inaccurately can be quickly re-measured, with different probe settings if need to enhance the original measurement accuracy.
Defining the patches that have measurement errors is very simple, as the various graphs provide all the necessary information on bad readings, specifically using the Tangent lines to spot obvious errors.
The above graph shows at least one point has a measurement value of Zero, as there is at least one Tangent line emanating/ending from/at coordinates 0,0. All other, shorter, Tangent lines are due to the target colour space being a lot smaller than the display's profiled colour space. This is because the profile is a pre-calibration, with the display in its native gamut, and the target colour space is sRGB.
Note: Extracting the profile's native colour space using Extract would assist in spotting bad measurements.
With the error point selected, the patch colour is automatically set to that colour, and a using Manual Measure can be re-measured.
If there are multiple points that have the same error reading, as above, the pop-up Point Info window can be used to select each point in turn.
Note: When performing point re-measurement, it may be preferable to turn off Intelligent Integration if available for the probe in use, and set the default Integration time to its maximum. This will speed-up the single point measurements.
To assist in isolating points to be re-measured, the various filters within Graph Options can be used, such as Custom Filters and the delta-E Filter.
The Export selection option within the Point Info window can also be used with higher ColourSpace license levels to export the selected points/patches as a .csv patch list.
Additionally, as defined within the Profile Concatenation section below, Add/Modify Points can also be used with higher ColourSpace license levels to re-read points via the Characterisation menu in combination with the Custom Filter option.
Spotting Measurement Errors
Knowing what points are actually measurement errors can take some additional knowledge and understanding.
The following RGB Separation graph, which is unique to ColourSpace, shows there are issues in the low brightness readings of the profile. Initially, it may seem the errors are in the grey scale. However, understanding what the RGB Separation graph shows it is easy understand that the error patch readings may just as easily be in the R, G, or B primary patches associated with the same value grey scale patches.
The selected grey scale patch is 196,196,196, meaning the measurement error will be with patch 196,0,0 or 0,196,0 or 0,0,196.
The Sliders can be set to each patch colour in turn, and the Actual, Deviation, and dE values will show the bad reading, as well as highlighting them in the CIE graphs, as in the above Tangent Error graph.
