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added Film model with reciprocity formulas
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lib/data/models/film.dart
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229
lib/data/models/film.dart
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import 'dart:math';
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import 'package:flutter/foundation.dart';
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import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
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double log10(double x) => log(x) / log(10);
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double log10polynomian(
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double x,
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double a,
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double b,
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double c,
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) =>
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a * pow(log10(x), 2) + b * log10(x) + c;
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/// Only Ilford films have reciprocity formulas provided by the manufacturer:
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/// https://www.ilfordphoto.com/wp/wp-content/uploads/2017/06/Reciprocity-Failure-Compensation.pdf
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///
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/// Reciprocity formulas for Fomapan films and Kodak films are from here:
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/// https://www.flickr.com/groups/86738082@N00/discuss/72157626050157470/
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///
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/// Cinema films like Kodak 5222/7222 Double-X and respective CineStill films (cause they are basically a modification of Kodak)
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/// do not have any reciprocity failure information, as these films are ment to be used in cinema
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/// with appropriate light and pretty short shutter speeds.
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///
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class Film {
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final String name;
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final int iso;
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const Film(this.name, this.iso);
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const Film.other()
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: name = 'Other',
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iso = 0;
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@override
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String toString() => name;
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ShutterSpeedValue reciprocityFailure(ShutterSpeedValue shutterSpeed) {
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if (shutterSpeed.isFraction) {
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return shutterSpeed;
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} else {
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return ShutterSpeedValue(
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reciprocityFormula(shutterSpeed.rawValue),
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shutterSpeed.isFraction,
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shutterSpeed.stopType,
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);
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}
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}
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@protected
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double reciprocityFormula(double t) => t;
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static const List<Film> values = [
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Film.other(),
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FomapanFilm.creative100(),
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FomapanFilm.creative100(),
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FomapanFilm.creative200(),
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FomapanFilm.action400(),
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IlfordFilm.ortho(),
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IlfordFilm.delta100(),
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IlfordFilm.delta400(),
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IlfordFilm.delta3200(),
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IlfordFilm.fp4(),
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IlfordFilm.hp5(),
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IlfordFilm.panf(),
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IlfordFilm.sfx200(),
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IlfordFilm.xp2super(),
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IlfordFilm.pan100(),
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IlfordFilm.pan400(),
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KodakFilm.tmax100(),
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KodakFilm.tmax400(),
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KodakFilm.tmax3200(),
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KodakFilm.trix320(),
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KodakFilm.trix400(),
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];
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}
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/// https://www.tate.org.uk/documents/598/page_6_7_agfa_stocks_0.pdf
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/// https://www.filmwasters.com/forum/index.php?topic=5298.0
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// {{1,1.87},{2,3.73},{3,8.06},{4,13.93},{5,21.28},{6,23.00},{7,30.12},{8,38.05},{9,44.75},{10,50.12},{20,117},{30,202},{40,293},{50,413},{60,547},{70,694},{80,853},{90,1022},{100,1202}};
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class AgfaFilm extends Film {
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final double a;
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final double b;
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final double c;
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const AgfaFilm.apx100()
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: a = 1,
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b = 5,
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c = 2,
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super('Agfa APX 100', 100);
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const AgfaFilm.apx400()
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: a = 1.5,
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b = 4.5,
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c = 3,
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super('Agfa APX 400', 400);
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@override
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double reciprocityFormula(double t) => t * log10polynomian(t, a, b, c);
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}
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class FomapanFilm extends Film {
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final double a;
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final double b;
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final double c;
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/// https://www.foma.cz/en/fomapan-100
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const FomapanFilm.creative100()
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: a = 1,
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b = 5,
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c = 2,
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super('Fomapan CREATIVE 100', 100);
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/// https://www.foma.cz/en/fomapan-200
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const FomapanFilm.creative200()
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: a = 1.5,
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b = 4.5,
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c = 3,
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super('Fomapan CREATIVE 200', 400);
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/// https://www.foma.cz/en/fomapan-100
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const FomapanFilm.action400()
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: a = -1.25,
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b = 5.75,
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c = 1.5,
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super('Fomapan ACTION 400', 400);
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}
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class IlfordFilm extends Film {
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final double reciprocityPower;
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/// https://www.ilfordphoto.com/amfile/file/download/file/1948/product/1650/
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const IlfordFilm.ortho()
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: reciprocityPower = 1.25,
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super('Ilford ORTHO+', 80);
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/// https://www.ilfordphoto.com/amfile/file/download/file/1919/product/686/
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const IlfordFilm.fp4()
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: reciprocityPower = 1.26,
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super('Ilford FP4+', 125);
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/// https://www.ilfordphoto.com/amfile/file/download/file/1903/product/691/
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const IlfordFilm.hp5()
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: reciprocityPower = 1.31,
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super('Ilford HP5+', 400);
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/// https://www.ilfordphoto.com/amfile/file/download/file/3/product/679/
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const IlfordFilm.delta100()
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: reciprocityPower = 1.26,
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super('Ilford DELTA 100', 100);
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/// https://www.ilfordphoto.com/amfile/file/download/file/1915/product/684/
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const IlfordFilm.delta400()
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: reciprocityPower = 1.41,
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super('Ilford DELTA 400', 400);
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/// https://www.ilfordphoto.com/amfile/file/download/file/1913/product/682/
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const IlfordFilm.delta3200()
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: reciprocityPower = 1.33,
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super('Ilford DELTA 3200', 3200);
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/// https://www.ilfordphoto.com/amfile/file/download/file/1905/product/699/
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const IlfordFilm.panf()
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: reciprocityPower = 1.33,
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super('Ilford Pan F+', 50);
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/// https://www.ilfordphoto.com/amfile/file/download/file/1907/product/701/
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const IlfordFilm.sfx200()
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: reciprocityPower = 1.31,
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super('Ilford SFX 200', 200);
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/// https://www.ilfordphoto.com/amfile/file/download/file/1909/product/703/
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const IlfordFilm.xp2super()
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: reciprocityPower = 1.31,
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super('Ilford XP2 SUPER', 400);
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/// https://www.ilfordphoto.com/amfile/file/download/file/1958/product/696/
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const IlfordFilm.pan100()
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: reciprocityPower = 1.26,
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super('Kentemere 100', 100);
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/// https://www.ilfordphoto.com/amfile/file/download/file/1959/product/697/
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const IlfordFilm.pan400()
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: reciprocityPower = 1.30,
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super('Kentemere 400', 100);
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@override
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double reciprocityFormula(double t) => pow(t, reciprocityPower).toDouble();
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}
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class KodakFilm extends Film {
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final double a;
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final double b;
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final double c;
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const KodakFilm.tmax100()
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: a = 1 / 6,
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b = 0,
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c = 4 / 3,
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super('Kodak T-MAX 100', 100);
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const KodakFilm.tmax400()
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: a = 2 / 3,
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b = -1 / 2,
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c = 4 / 3,
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super('Kodak T-MAX 400', 400);
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const KodakFilm.tmax3200()
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: a = 7 / 6,
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b = -1,
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c = 4 / 3,
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super('Kodak T-MAX 3200', 3200);
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const KodakFilm.trix320()
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: a = 2,
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b = 1,
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c = 2,
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super('Kodak TRI-X 320', 320);
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const KodakFilm.trix400()
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: a = 2,
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b = 1,
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c = 2,
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super('Kodak TRI-X 400', 400);
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@override
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double reciprocityFormula(double t) => t * log10polynomian(t, a, b, c);
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}
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