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