Premium PSO tolerances

The tolerances in accordance with ISO-12647 (PSO) and the tighter tolerances for the Premium PSO certification are listed in the following table:

 

Deviation tolerances
(Target value – OK sheet)
Tolerances under ISO 12647-2
/ process standard offset
Premium PSO
Tolerances
Tone value in
highlight area
Max. +/- 3 Max. +/- 3
Tone value mid-tone Max. +/- 4 Max. +/- 3
Tone value in shadow area Max. +/- 3 Max. +/- 3
Spreading of TWZ (total amount of colour) of mid-tones (CMY) Max. 5 Max. 4
L*a*b* primary colours (CMYK) Max. ΔE= 5 Max. ΔE= 4
L*a*b* secondary colours (RGB) Not specified Max. ΔE= 6
L*a*b* tertiary colour (grey) Not specified Max. ΔE= 8
Fluctuation tolerances
(Actual value OK sheet – production run)
Tolerances under ISO 12647-2 /
process standard offset
Premium PSO
Tolerances
Tone value mid-tone Max. +/- 4 Max. +/- 3
Tone value in shadow area Max. +/- 3 Max. +/- 3
Spreading of TWZ (total amount of colour) of mid-tones (CMY) Max. 5 Max. 4
L*a*b* primary colours (CMK) Max. ΔE= 4 Max. ΔE= 3
L*a*b* primary colour (Y) Max. ΔE= 5 Max. ΔE= 3
L*a*b* secondary colours (RGB) Not specified Max. ΔE= 4
L*a*b* tertiary colour (grey) Not specified Max. ΔE= 6