User guide
X-Rite eXact™ Instrument
45
∆E Trend Function
This function plots the Delta E (uses the active delta E method setting) value of the current and
past samples that have been measured to the current standard. The graph will show up to 10 of
the latest readings.
Color coding for bar graphs:
• White: past sample to a standard that doesn’t have any active Pass/Fail tolerances
• Blue: latest sample/reading. No pass/fail
• Red: sample that failed the current standards Pass/Fail tolerance
• Yellow: sample hasn’t failed, but has exceeded the action limit threshold
• Green: pass
Search/Compare tools: Resets if the standard changes, even if the previous standard is returned
to. Readings will only be added to the graph if it is the current function on screen.
Job Tools: Track measurements for every patch for a particular Patch type. For example, if used
as part of the function list for solid patches, the graph will track any measurement made to any
of the solid patches the job template contains. The graph does not have to be on screen for it to
gather new readings made towards a solid patch.
∆E Trend Measurement
The graph will show up to 10 of the latest readings. An overall average is shown at the top for all
readings taken in the trend graph (even if more than 10 readings are taken).
1. Select ∆E Trend function.
2. Measure paper.
3. Tap the Measure Standard icon
or tap the Standard icon to access the screen where
a standard is measured or selected from the library.
4. Measure the standard, use the last reading, or select from the Pantone library.
5. Tap the Back icon to return to the measurement screen.
6. Measure samples to compare to the standard.
7. View results.
Metamerism Function
The phenomenon where two colors appear to match under one light source, yet do not match
under different light sources. Two such colors are called a metameric pair. Up to three
Illuminant/observers can be compared to the current Illuminant/observer parameter. These will
show up in the results as MI1, MI2, and MI3.
Average DE value
Simulated color of standard
Function, illum/obs, and
Measurement Condition
selected
Simulated color of sample
Sample measurements