#include <assert.h>
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include "common/darktable.h"
#include "develop/imageop_math.h"

Include dependency graph for luminance_mask.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Macros
#define	MIN_FLOAT exp2f(-16.0f)

#define	LOOP(fn)

Typedefs
typedef enum dt_iop_luminance_mask_method_t	dt_iop_luminance_mask_method_t

Enumerations
enum	dt_iop_luminance_mask_method_t { DT_TONEEQ_MEAN = 0 , DT_TONEEQ_LIGHTNESS , DT_TONEEQ_VALUE , DT_TONEEQ_NORM_1 , DT_TONEEQ_NORM_2 , DT_TONEEQ_NORM_POWER , DT_TONEEQ_GEOMEAN , DT_TONEEQ_LAST }

Functions
static float	linear_contrast (const float pixel, const float fulcrum, const float contrast)

	__OMP_DECLARE_SIMD__ (aligned(image, luminance:64) uniform(image, luminance)) static void pixel_rgb_mean(const float *const restrict image

	__OMP_SIMD__ (reduction(+:lum) aligned(image:64)) for(int c=0

Variables
float *const restrict	luminance

float *const restrict const size_t	k

float *const restrict const size_t const size_t	ch

float *const restrict const size_t const size_t const float	exposure_boost

float *const restrict const size_t const size_t const float const float	fulcrum

float *const restrict const size_t const size_t const float const float const float	contrast_boost

Macro Definition Documentation

◆ LOOP

#define LOOP ( fn )

Value:

    {                                                                     \
      for(size_t k = 0; k < num_elem; k += ch)                            \
      {                                                                   \
        fn(in, out, k, ch, exposure_boost, fulcrum, contrast_boost);      \
      }                                                                   \
      break;                                                              \
    }

◆ MIN_FLOAT

#define MIN_FLOAT exp2f(-16.0f)

Typedef Documentation

◆ dt_iop_luminance_mask_method_t

typedef enum dt_iop_luminance_mask_method_t dt_iop_luminance_mask_method_t

Enumeration Type Documentation

◆ dt_iop_luminance_mask_method_t

enum dt_iop_luminance_mask_method_t

Enumerator
DT_TONEEQ_MEAN
DT_TONEEQ_LIGHTNESS
DT_TONEEQ_VALUE
DT_TONEEQ_NORM_1
DT_TONEEQ_NORM_2
DT_TONEEQ_NORM_POWER
DT_TONEEQ_GEOMEAN
DT_TONEEQ_LAST

Function Documentation

◆ __OMP_DECLARE_SIMD__()

__OMP_DECLARE_SIMD__ ( aligned(image, luminance:64) uniform(image, luminance) ) const

◆ __OMP_SIMD__()

__OMP_SIMD__ ( reduction(+:lum) aligned(image:64) )

pure virtual

◆ linear_contrast()

static float linear_contrast	(	const float	pixel,
		const float	fulcrum,
		const float	contrast
	)

static

DOCUMENTATION

Lightness map computation

Flatten an RGB image into a lightness/luminance map (grey image) using several vector norms, and other pseudo-norms.

These functions are all written to be vectorizable, using the base image pointer and the explicit index of the current pixel. They perform exposure and contrast compensation as well, for better cache handling.

Buffers need to be 64-bits aligned.

The outputs are clipped to avoid negative and close-to-zero results that could backfire in the exposure computations.

References fulcrum, and MIN_FLOAT.