gamma.c File Reference

#include "config.h"
#include "gamma.h"
#include <math.h>
#include <gphoto2/gphoto2-result.h>

Include dependency graph for gamma.c:

Functions
int	gp_gamma_correct_single (unsigned char *table, unsigned char *data, unsigned int size)
	Gamma correction.
int	gp_gamma_fill_table (unsigned char *table, double g)
	Initialize a Gamma conversion table.

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Detailed Description

Author:

Copyright 2001 Lutz Müller <lutz@users.sf.net>

License

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

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Function Documentation

int gp_gamma_correct_single	(	unsigned char *	table,
		unsigned char *	data,
		unsigned int	size
	)

Gamma correction.

Corrects size pixels within the table with a given Gamma correction table.

Parameters:

	table	the gamma correction table as generated by gp_gamma_fill_table()
	data	the data do process, both input and output
	size	in number of pixels (RGB byte pairs)

Returns:

a gphoto error code

int gp_gamma_fill_table	(	unsigned char *	table,
		double	g
	)

Initialize a Gamma conversion table.

Initializes the gamma conversion table for later use by gp_gamma_correct_single(). Requires a 256 byte array as table.

Parameters:

	table	a 256 byte array of unsigned char
	g	gamma correction value

Returns:

a gphoto error code

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