Linear Photographic Tone Mapping Filter

Filter

RIF_IMAGE_FILTER_PHOTO_LINEAR_TONEMAP

Description

Photographic tone mapper that emulates the work of camera.

Based on following formulas:

https://en.wikipedia.org/wiki/Film_speed#Measurements_and_calculations.

The filter computes the luminous exposure H (in lux seconds):

where we assume q = 0.65. Pixel value is multiplied by H.

After that, gamma correction is applied.

Parameters

Parameter	Type	Input/Output	Description
gamma	float	input	Gamma correction value. Value range is [0, 5], default value is 2.2.
exposureTime	float	input	Film exposure time. Value range is [0, 100], default value is 0.125.
sensitivity	float	input	Luminance of the scene (in candela per m^2). Value range is [0, 100], default value is 1.
fstop	float	input	Aperture f-number. Value range is [0, 100], default value is 1.