Oce VarioPrint i Series, Operation Manual

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△ E76 (Delta E 1976)
Metrics Description
Substrate ∆E76 Colour difference in ∆E76 between the measured and the reference
substrate white. For a side-by-side evaluation, the colour control
strip must be printed with the rendering intent absolute colorimetric.
The reference substrate white is compared to the measured simula-
ted substrate white of the printed media.
Maximum ∆E76 Highest colour difference in ∆E76 between the measured Lab values
of the colour patches on the colour control strip and the Lab values
of the matching patches of the reference printing condition.
Average ∆E76 Average colour difference in ∆E76 between the measured Lab values
of the colour patches on the colour control strip and the Lab values
of the matching patches of the reference printing condition.
95th percentile ∆E76 The 95th percentile ∆E76 colour difference between the measured
Lab values of the colour patches on the colour control strip and the
Lab values of the matching patches of the reference printing condi-
tion. This means that 95% of all measured patches have ∆E76 colour
differences smaller than or equal to the metric value.
Maximum ∆E76 CMYK
solids Highest colour difference in ∆E76 between the measured Lab values
of the CMYK solid patches on the colour control strip and the Lab
values of the matching patches of the reference printing condition.
Maximum ∆E76 CMY
solids Highest colour difference in ∆E76 between the measured Lab values
of the CMY solid patches on the colour control strip and the Lab val-
ues of the matching patches of the reference printing condition.
Maximum ∆E76 RGB
overprints Highest colour difference in ∆E76 between the measured Lab values
of the RGB overprint patches on the colour control strip and the Lab
values of the matching patches of the reference printing condition.
NOTE
• Delta E 1976,
△
E76 is based on a less complicated and accurate distance calculation. (
△
E
(Delta E) on page 262
)
• Refer to
Patches of the target chart on page 259
for to the read description of the patches.
△
H (Delta H)
Metrics Description
Maximum ∆H CMYK sol-
ids Highest colour difference in ∆H between the measured Lab values of
the CMYK solid patches on the colour control strip and the Lab val-
ues of the matching patches of the reference printing condition.
Maximum ∆H CMYK sol-
ids and RGB overprints Highest colour difference in ∆H between the measured Lab values of
the CMYK solid patches and the RGB overprint patches on the colour
control strip and the Lab values of the matching patches of the refer-
ence printing condition.
Maximum ∆H CMY sol-
ids and RGB overprints Highest colour difference in ∆H between the measured Lab values of
the CMY solid patches and the RGB overprint patches on the colour
control strip and the Lab values of the matching patches of the refer-
ence printing condition.
4
Overview of colour validation metrics
376 Chapter 14 - References