color_utils.h File Reference

#include "libavutil/pixfmt.h"

Go to the source code of this file.

Typedefs
typedef double(*	avpriv_trc_function) (double)

Functions
double	avpriv_get_gamma_from_trc (enum AVColorTransferCharacteristic trc)
	Determine a suitable 'gamma' value to match the supplied AVColorTransferCharacteristic. More...
avpriv_trc_function	avpriv_get_trc_function_from_trc (enum AVColorTransferCharacteristic trc)
	Determine the function needed to apply the given AVColorTransferCharacteristic to linear input. More...

Typedef Documentation

avpriv_trc_function

typedef double(* avpriv_trc_function) (double)

Definition at line 40 of file color_utils.h.

Function Documentation

avpriv_get_gamma_from_trc()

double avpriv_get_gamma_from_trc

(

enum AVColorTransferCharacteristic

trc

)

Determine a suitable 'gamma' value to match the supplied AVColorTransferCharacteristic.

See Apple Technical Note TN2257 (https://developer.apple.com/library/mac/technotes/tn2257/_index.html)

Returns

Will return an approximation to the simple gamma function matching the supplied Transfer Characteristic, Will return 0.0 for any we cannot reasonably match against.

Definition at line 28 of file color_utils.c.

Referenced by mov_write_gama_tag(), and png_get_gama().

avpriv_get_trc_function_from_trc()

avpriv_trc_function avpriv_get_trc_function_from_trc

(

enum AVColorTransferCharacteristic

trc

)

Determine the function needed to apply the given AVColorTransferCharacteristic to linear input.

The function returned should expect a nominal domain and range of [0.0-1.0] values outside of this range maybe valid depending on the chosen characteristic function.

Returns

Will return pointer to the function matching the supplied Transfer Characteristic. If unspecified will return NULL:

Definition at line 170 of file color_utils.c.

Referenced by decode_block(), decode_init(), and main().