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Question

Which conversions are applied when using the Emulation Proof option in the Proof for Contract Approval ticket and what is the reference when verification is enabled?

Answer

It's important to understand the use cases and the difference between the Pack Proof proofing methods before we dive into the details of the emulation proof option.

Pack Proof proofing methods

Pack Proof offers two methods to proof a job: Standard proofing and Emulation proofing.

Standard proofingEmulation proofing
This is the classic way of proofing, also called contract proofing. This method is used to simulate on a proofing device, how a job is printed on a conventional press.

A proofing color strategy is required to make a standard contract proof.
This method is typically used by converters who want to simulate on a proofing device, how a job will look like when moving a job from a conventional press to a digital press. Moving a job to a digital press is, for example done when a reprint of a few copies is ordered.

A digital printing and proofing color strategy is required in order to make an emulation proof!
Proofing Color Strategy

Source profile:
ISOcoated_v2_300_eci

Afbeeldingsresultaat voor epson surecolor p7000

          Destination profile:
SureColor-P7000_720x1440_SM

Digital Printing Color StrategyProofing Color Strategy

Source profile:
ISOcoated_v2_300_eci

Source profile:
HPI-Coated_7c

Afbeeldingsresultaat voor epson surecolor p7000

Destination profile:
HPI-Coated_7c

Destination profile:
SureColor-P7000_720x1440_SM

→ Digital Printing destination profile = Proofing Source Profile

Emulation proof conversion

Let's have a look to how a job is converted in case of an emulation proof.

Basically, the job undergoes two conversions.

  • Conversion 1 uses a digital printing color strategy to simulate on the digital press, how the job is printed on a conventional press.
  • Conversion 2 uses a proofing color strategy to simulate on a proofer how the "conventional job" is printed on a digital press.
Conversion 1Conversion 2
Digital Printing Color Strategy

Source profile:
ISOcoated_v2_300_eci

Original:

Process: 100% Cyan= L 55 / a -37 / b -50
Spot: 100% PMS 266= L 39 / a 45 / b -58  

                                              Afbeeldingsresultaat voor arrow down

Destination profile:
HPI-Coated_7c

Intermediate:

Process: 100% C / 7.8% M / 0.8% K=L 54.5 / a -37 / b -49
Spot: 5% Y / 100% V= L 37 / a 44 / b -56

Proofing Color Strategy

Source profile:
HPI-Coated_7c

Intermediate:

Process: 100% C / 7.8% M / 0.8% K=L 54.5 / a -37 / b -49
Spot: 5% Y / 100% V= L 37 / a 44 / b -56

                                              Afbeeldingsresultaat voor arrow down

Afbeeldingsresultaat voor epson surecolor p7000

Destination profile:
SureColor-P7000_720x1440_SM

Proof:

Process: 77% C / 11% M / 15% Y / 4%K= L 53 / a -36 / b -51
Spot: 23% C / 20% K / 75% V= L 38 / a 43 / b -58

Verification of an emulation proof

Verification requires reference data to compare against. In case of an emulation proof, it's the Lab value calculated by the proofing color strategy for the converted (by the digital printing color strategy) input file.

Reference value (input Proofing color strategy)Output value after conversion (output Proofing color strategy)Measured value (= verification strip)verification result > dE value

Intermediate:

Process: 100% C / 7.8% M / 0.8% K=L 54.5 / a -37 / b -49
Spot: 5% Y / 100% V= L 37 / a 44 / b -56

Proof (calculated):

Process: 77% C / 11% M / 15% Y / 4%K= L 53 / a -36 / b -51
Spot: 23% C / 20% K / 75% V= L 38 / a 43 / b -58

Proof (measured):

L 54 / a -36.5 / b -50
L 38 / a 43 / b -58


dE= 0.6
dE= 1.5

Article information
Applies to

Pack Proof 18.0.1

Pack Proof 18.1

Created

30-Jan-19

Last revised
AuthorSDOB
Case NumberIE-13711
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