m3_lightmeter/lib/data/models/film.dart

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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<Film> 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);
}
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);
}