Lovibond
®
PFX
i
Series Operator’s Instruction Manual V1.6
Page 37 of 53
In the following example, the nearest colour is still the arrowed standard but Off Hue factor
has been increased to 11. In this example one would expect a visual comparison to give the
result as the 6
th
standard along.
It might be expected that the example below would never be achieved. However, it must be
considered as those coming into colour measurement with automatic instruments, who have
never used the visual instruments, might not have a comprehension of the colours of that
colour scale. Automatic instruments may well provide the answer as the arrowed standard,
which has an Off Hue factor of 17. The result from a visual system would certainly be highly
subjective and no two users would be likely to provide the same result.
The PFXi instruments not only display the Off Hue factor but also a description of the colour
difference such as redder and/or lighter.
