Screen Frequency LPI Dot-Gain Estimate
Matched same press/substrate/tone actual screen-frequency vs independently assayed tone-value increase, signed dot-gain evidence allowed. Matched piecewise-linear observational calibration with no extrapolation. Explicit declared color space/reference and caller applicability; not spectral equivalence, pigment mixing, press readiness or accessibility certification.
Description
Measured dot gain depends on screening and the matched printing condition.
Measured dot gain depends on screening and the matched printing condition.1
Interpolation of caller calibration differs from predicting gain from screen frequency alone. Use Screen Frequency LPI Dot-Gain Estimate to interpolate the supplied calibration.
When to use Screen Frequency LPI Dot-Gain Estimate
Use Screen Frequency LPI Dot-Gain Estimate to interpolate the supplied calibration. Choose a matched calibration, establish both axis units and supply strictly increasing sampled coordinates covering the query.
How to use Screen Frequency LPI Dot-Gain Estimate and understand its results
- Choose a matched calibration, establish both axis units and supply strictly increasing sampled coordinates covering the query.
- Enter Observed screen frequency dot gain coordinates, Independently matched screen frequency dot gain responses, Query screen frequency dot gain coordinate using the field table and validation rules below, then run the tool.
- Read Interpolated response, Local observed slope; 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 |
|---|---|---|---|
| observedScreenFrequencyDotGainCoordinates | Observed screen frequency dot gain coordinates | array of number | Required; constraints below |
| independentlyMatchedScreenFrequencyDotGainResponses | Independently matched screen frequency dot gain responses | array of number | Required; constraints below |
| queryScreenFrequencyDotGainCoordinate | Query screen frequency dot gain coordinate | number | Required; constraints below |
Provide at least two aligned finite coordinates and responses, with strictly increasing coordinates, and query within the closed sampled range. The tool locates the segment, linearly interpolates its response and returns its response-per-coordinate slope. At an interior sample it uses the segment to the right; at the final endpoint it uses the last segment. Units come from the supplied calibration. No extrapolation or built-in time, temperature or performance table is supplied.
slope = (y[i+1]−y[i])/(x[i+1]−x[i]); response = y[i]+slope×(query−x[i]) Use the field order, units and branch conditions described above.
| Output field | Meaning | Value type |
|---|---|---|
| interpolatedResponse | Response interpolated in the caller’s response-axis units. | number |
| localObservedSlope | Response-axis units per coordinate-axis unit on the selected segment. | number |
{
"input": {
"observedScreenFrequencyDotGainCoordinates": [
1,
2,
3
],
"independentlyMatchedScreenFrequencyDotGainResponses": [
2,
4,
8
],
"queryScreenFrequencyDotGainCoordinate": 2.5
},
"output": {
"interpolatedResponse": 6,
"localObservedSlope": 4
}
}Limitations and assumptions
Interpolation of caller calibration differs from predicting gain from screen frequency alone. 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 Paint Coverage Two Coats Tint Base Lookup for a related task: Two-coat paint coverage depends on a measured or documented usable coverage rate.
Use Trapping Overprint Requirement Basic Check for a related task: Trapping and overprint decisions depend on printing-process evidence and a defined rule set.
References
-
Screen Frequency LPI Dot-Gain Estimate — tool.io
Similar or alternative tools
- Paint Coverage Two Coats Tint Base Lookup
Two-coat paint coverage depends on a measured or documented usable coverage rate.
- Trapping Overprint Requirement Basic Check
Trapping and overprint decisions depend on printing-process evidence and a defined rule set.