physics::light::ev Namespace Reference

Exposure value. More...

Functions
template<class T >
T	from_luminance (T l, T s, T k)
	Exposure value from luminance. More...
template<class T >
T	from_illuminance (T e, T s, T c)
	Exposure value from illuminance. More...
template<class T >
T	from_settings (T n, T t, T s)
	Exposure value from exposure settings. More...
template<class T >
T	to_luminance (T ev, T s, T k)
	Exposure value to luminance. More...
template<class T >
T	to_illuminance (T ev, T s, T c)
	Exposure value to illuminance. More...

Detailed Description

Exposure value.

See also

https://en.wikipedia.org/wiki/Exposure_value

Function Documentation

from_illuminance()

template<class T >

T physics::light::ev::from_illuminance	(	T	e,
		T	s,
		T	c
	)

Exposure value from illuminance.

Parameters

e	Illuminance, in lux.
s	ISO arithmetic speed. A value of 100 corresponds to ISO 100.
c	Incident-light meter calibration constant. A common value is 250.

Returns

Exposure value.

Definition at line 60 of file exposure.hpp.

from_luminance()

template<class T >

T physics::light::ev::from_luminance	(	T	l,
		T	s,
		T	k
	)

Exposure value from luminance.

Parameters

l	Luminance, in cd/m^2.
s	ISO arithmetic speed. A value of 100 corresponds to ISO 100.
k	Reflected-light meter calibration constant. A common value is 12.5.

Returns

Exposure value.

Definition at line 45 of file exposure.hpp.

from_settings()

template<class T >

T physics::light::ev::from_settings	(	T	n,
		T	t,
		T	s
	)

Exposure value from exposure settings.

Parameters

n	Relative aperture (f-number).
t	Exposure time (shutter speed), in seconds.
s	ISO arithmetic speed. A value of 100 corresponds to ISO 100.

Returns

Exposure value.

Definition at line 75 of file exposure.hpp.

to_illuminance()

template<class T >

T physics::light::ev::to_illuminance	(	T	ev,
		T	s,
		T	c
	)

Exposure value to illuminance.

Parameters

ev	Exposure value.
s	ISO arithmetic speed. A value of 100 corresponds to ISO 100.
c	Incident-light meter calibration constant. A common value is 250.

Returns

Illuminance, in lux.

Definition at line 105 of file exposure.hpp.

to_luminance()

template<class T >

T physics::light::ev::to_luminance	(	T	ev,
		T	s,
		T	k
	)

Exposure value to luminance.

Parameters

ev	Exposure value.
s	ISO arithmetic speed. A value of 100 corresponds to ISO 100.
k	Reflected-light meter calibration constant. A common value is 12.5.

Returns

Luminance, in cd/m^2.

Definition at line 90 of file exposure.hpp.