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 proofing | Emulation 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! | |||||||||||||||
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→ 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 1 | Conversion 2 | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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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 | Proof (calculated): Process: 77% C / 11% M / 15% Y / 4%K= L 53 / a -36 / b -51 | Proof (measured): L 54 / a -36.5 / b -50 | dE= 0.6 |
| Article information | |
|---|---|
| Applies to | Pack Proof 18.0.1 Pack Proof 18.1 |
| Created | 30-Jan-19 |
| Last revised | |
| Author | SDOB |
| Case Number | IE-13711 |