color_xform.c File Reference

Raster Library - Colors management. More...

#include <math.h>
#include <grass/gis.h>
#include <grass/raster.h>

Include dependency graph for color_xform.c:

Go to the source code of this file.

Functions
void	Rast_histogram_eq_colors (struct Colors *dst, struct Colors *src, struct Cell_stats *statf)
	Make histogram-stretched version of existing color table. More...
void	Rast_histogram_eq_fp_colors (struct Colors *dst, struct Colors *src, struct FP_stats *statf)
	Make histogram-stretched version of existing color table (FP version) More...
void	Rast_log_colors (struct Colors *dst, struct Colors *src, int samples)
	Make logarithmically-scaled version of an existing color table. More...
void	Rast_abs_log_colors (struct Colors *dst, struct Colors *src, int samples)
	Make logarithmically-scaled version of an existing color table, allowing for signed values. More...

Detailed Description

Raster Library - Colors management.

(C) 2001-2021 by the GRASS Development Team

This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.

Author

Original author CERL

Definition in file color_xform.c.

Function Documentation

Rast_abs_log_colors()

void Rast_abs_log_colors	(	struct Colors *	dst,
		struct Colors *	src,
		int	samples
	)

Make logarithmically-scaled version of an existing color table, allowing for signed values.

Parameters

[out]	dst	struct to hold new colors
	src	struct containing original colors
	samples	number of samples

Definition at line 250 of file color_xform.c.

References dst, MAX, max, MIN, min, Rast_get_d_color(), Rast_get_d_color_range(), Rast_get_default_color(), Rast_get_null_value_color(), Rast_init_colors(), Rast_set_default_color(), Rast_set_null_value_color(), src, and x.

Rast_histogram_eq_colors()

void Rast_histogram_eq_colors	(	struct Colors *	dst,
		struct Colors *	src,
		struct Cell_stats *	statf
	)

Make histogram-stretched version of existing color table.

Generates a histogram contrast-stretched color table that goes from the histogram information in the Cell_stats structure statf. (See Raster Histograms).

Parameters

[out]	dst	struct to hold new colors
	src	struct containing original colors
	statf	cell stats info

Definition at line 30 of file color_xform.c.

References count, max, and min.

Rast_histogram_eq_fp_colors()

void Rast_histogram_eq_fp_colors	(	struct Colors *	dst,
		struct Colors *	src,
		struct FP_stats *	statf
	)

Make histogram-stretched version of existing color table (FP version)

Generates a histogram contrast-stretched color table that goes from the histogram information in the FP_stats structure statf. (See Raster Histograms).

Parameters

[out]	dst	struct to hold new colors
	src	struct containing original colors
	statf	cell stats info

Definition at line 107 of file color_xform.c.

References max, and min.

Rast_log_colors()

void Rast_log_colors	(	struct Colors *	dst,
		struct Colors *	src,
		int	samples
	)

Make logarithmically-scaled version of an existing color table.

Parameters

[out]	dst	struct to hold new colors
	src	struct containing original colors
	samples	number of samples

Definition at line 181 of file color_xform.c.

References dst, max, min, Rast_add_d_color_rule(), Rast_get_d_color(), Rast_get_d_color_range(), Rast_get_default_color(), Rast_get_null_value_color(), Rast_init_colors(), Rast_set_default_color(), Rast_set_null_value_color(), src, and x.