HP Indigo WS6600 Working with Indigo ElectroInk SilverHow-to Guide - Page 36

Measuring Silver ink OD

Get HP Indigo WS6600 PDF manuals and user guides View all HP Indigo WS6600 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 36 highlights

Measuring Silver ink OD ● Silver ink OD should be measured in M3 conditions (with polarizers). This can be done by the external eXact spectrophotometer. ● The on-press spectrophotometer (SPM) can measure only in M0 conditions. ● In order to measure the OD of the silver ink with an M0 external spectrophotometer, you need to measure the OD of Silver printed by 2 hits, subtracted by the OD of Silver printed over 1 hit of black, subtracted by the OD of 2 hits of silver = 0.07 ± 0.02 in black channel (for coated gloss and semi matte - white substrates only). ● The M0 output is the subtraction of 2 elements: Target OD of Silver (M0) = OD of 2 hits of Silver on Black - OD of 2 hits of Silver NOTE: ● M3 is higher ⇒ M0 is lower ⇒ more Silver ● M3 is lower ⇒ M0 is higher ⇒ less Silver ● Typical values for M3: 0.9 -1.3 ● OD target range for M0: 0.05 - 0.16 32 Appendix A Full color calibration

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
Measuring Silver ink OD
●
Silver ink OD should be measured in M3
conditions (with polarizers). This can be done
by the external eXact spectrophotometer.
●
The on-press spectrophotometer (SPM) can
measure only in M0 conditions.
●
In order to measure the OD of the silver ink with
an M0 external spectrophotometer, you need
to measure the OD of Silver printed by 2 hits,
subtracted by the OD of Silver printed over 1 hit
of black, subtracted by the OD of 2 hits of silver
= 0.07 ± 0.02 in black channel (for coated gloss
and semi matte – white substrates only).
●
The M0 output is the subtraction of 2 elements:
Target OD of Silver (M0) = OD of 2 hits of Silver on Black – OD of 2 hits of Silver
NOTE:
●
M3 is higher
⇒
M0 is lower
⇒
more Silver
●
M3 is lower
⇒
M0 is higher
⇒
less Silver
●
Typical values for M3: 0.9 -1.3
●
OD target range for M0: 0.05 – 0.16
32
Appendix A
Full color calibration