Trapping Overprint Requirement Basic Check

Independently observed registration/knockout/ink/substrate job facts against caller pre press review requirements; not infer trap width or safe overprint from hue. Independently declared positive evidence requirements; overlaps and unknowns retained. Explicit declared color space/reference and caller applicability; not spectral equivalence, pigment mixing, press readiness or accessibility certification.

Description

Trapping and overprint decisions depend on printing-process evidence and a defined rule set.

Trapping and overprint decisions depend on printing-process evidence and a defined rule set.^[1]

Unknown observations must remain distinct from witnessed print-production prerequisites. Use Trapping Overprint Requirement Basic Check to evaluate the supplied inputs under the model explained below.

When to use Trapping Overprint Requirement Basic Check

Use Trapping Overprint Requirement Basic Check to evaluate the supplied inputs under the model explained below. Define the candidate classes and their positive-evidence requirements, then distinguish evidence presence from whether it is known.

How to use Trapping Overprint Requirement Basic Check and understand its results

Define the candidate classes and their positive-evidence requirements, then distinguish evidence presence from whether it is known.
Enter Caller trap overprint class ids, Caller trap overprint requirements, Observed trap overprint evidence, Known trap overprint flags using the field table and validation rules below, then run the tool.
Read Compatible caller classes, Fully witnessed caller classes; interpret the units, signs, ordering and unknown-value placeholders described below.
Correct reported input errors and rerun. Apply successful results according to their specific meanings and check the assumptions before using them in a decision.

Input field	Meaning	Value type	Requirement
callerTrapOverprintClassIds	Caller trap overprint class ids	array of string	Required; constraints below
callerTrapOverprintRequirements	Caller trap overprint requirements	array of array	Required; constraints below
observedTrapOverprintEvidence	Observed trap overprint evidence	array of number	Required; constraints below
knownTrapOverprintFlags	Known trap overprint flags	array of number	Required; constraints below

Supply unique nonblank class IDs, one rectangular binary requirement row per class, and aligned binary observation and known-flag arrays. Each class must require at least one positive witness. Requirement 0 ignores an evidence column; requirement 1 needs a known positive observation for full witnessing. An unknown requirement remains compatible, while a known absent requirement excludes the class. Both returned class lists preserve caller order. No readiness rubric is installed and compatible does not mean fully witnessed or approved.

compatible = no required known absence; fully witnessed = every required witness known and positive

Use the field order, units and branch conditions described above.

Output field	Meaning	Value type
compatibleCallerClasses	Caller classes with no known absence of required positive evidence.	array of string
fullyWitnessedCallerClasses	Caller classes with all required positive evidence known and present.	array of string

json

{
  "input": {
    "callerTrapOverprintClassIds": [
      "a",
      "b"
    ],
    "callerTrapOverprintRequirements": [
      [
        1,
        0
      ],
      [
        0,
        1
      ]
    ],
    "observedTrapOverprintEvidence": [
      1,
      0
    ],
    "knownTrapOverprintFlags": [
      1,
      0
    ]
  },
  "output": {
    "compatibleCallerClasses": [
      "a",
      "b"
    ],
    "fullyWitnessedCallerClasses": [
      "a"
    ]
  }
}

Limitations and assumptions

Unknown observations must remain distinct from witnessed print-production prerequisites. Apply the exact scope and assumptions explained above.

All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse arrays fail validation. Domain-specific bounds, alignments and supported tokens are explained above; extremely large inputs or outputs can also be rejected. Input errors differ from successful false results, empty match lists and unknown-evidence placeholders.

Alternative or Complementary methods

Use Spot vs Process Cost Factor Lookup for a related task: Spot and process print quotes can be compared on one currency and job basis.

Use Screen Frequency LPI Dot-Gain Estimate for a related task: Measured dot gain depends on screening and the matched printing condition.

References

Trapping Overprint Requirement Basic Check — tool.io

Similar or alternative tools

Spot vs Process Cost Factor Lookup
Spot and process print quotes can be compared on one currency and job basis.
Screen Frequency LPI Dot-Gain Estimate
Measured dot gain depends on screening and the matched printing condition.