color_hist.c File Reference

Raster Library - histogram grey scale colors. More...

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

Include dependency graph for color_hist.c:

Go to the source code of this file.

Functions
void	Rast_make_histogram_eq_colors (struct Colors *colors, struct Cell_stats *statf)
	Make histogram-stretched grey colors.
void	Rast_make_histogram_log_colors (struct Colors *colors, struct Cell_stats *statf, int min, int max)
	Generates histogram with normalized log transformed grey scale.

Detailed Description

Raster Library - histogram grey scale colors.

(C) 2007-2009 Glynn Clements and 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

Glynn Clements glynn.nosp@m.@gcl.nosp@m.ement.nosp@m.s.pl.nosp@m.us.co.nosp@m.m

Definition in file color_hist.c.

Function Documentation

Rast_make_histogram_eq_colors()

void Rast_make_histogram_eq_colors	(	struct Colors *	colors,
		struct Cell_stats *	statf
	)

Make histogram-stretched grey colors.

Generates a histogram contrast-stretched grey scale color table that goes from the, histogram information in the Cell_stats structure (see Raster Histograms).

Color range is 0-255.

Parameters

colors	pointer to Colors structure which holds color info
statf	pointer to Cell_stats structure which holds cell stats info

Definition at line 32 of file color_hist.c.

References count, DEFAULT_BG_COLOR, G_str_to_color(), Rast_add_c_color_rule(), Rast_init_colors(), Rast_next_cell_stat(), Rast_rewind_cell_stats(), Rast_set_null_value_color(), and x.

Rast_make_histogram_log_colors()

void Rast_make_histogram_log_colors	(	struct Colors *	colors,
		struct Cell_stats *	statf,
		int	min,
		int	max
	)

Generates histogram with normalized log transformed grey scale.

Generates histogram with normalized log transformed grey scale from cell stats structure info. Color range is 0-255.

Parameters

colors	pointer to Colors structure which holds color info
statf	pointer to Cell_stats structure which holds cell stats info
min	minimum value
max	maximum value

Definition at line 101 of file color_hist.c.

References count, DEFAULT_BG_COLOR, G_str_to_color(), max, min, Rast_add_c_color_rule(), Rast_init_colors(), Rast_next_cell_stat(), Rast_rewind_cell_stats(), Rast_set_null_value_color(), and x.