Struct defining white point location in terms of CIE 1931 chromaticity x and y.

Definition at line 72 of file csp.h.

Function pointer representing a double -> double transfer function that performs an EOTF transfer inversion.

This function outputs linear light.

Definition at line 87 of file csp.h.

Retrieves the Luma coefficients necessary to construct a conversion matrix from an enum constant describing the colorspace.

Parameters

csp An enum constant indicating YUV or similar colorspace.

Returns

The Luma coefficients associated with that colorspace, or NULL if the constant is unknown to libavutil.

Definition at line 58 of file csp.c.

Referenced by create_filtergraph(), ff_draw_init2(), filter_frame(), init(), init_filter(), and tonemap_opencl_init().

Retrieves a complete gamut description from an enum constant describing the color primaries.

Parameters

prm An enum constant indicating primaries

Returns

A description of the colorspace gamut associated with that enum constant, or NULL if the constant is unknown to libavutil.

Definition at line 90 of file csp.c.

Referenced by create_filtergraph(), ff_icc_profile_generate(), get_rgb2rgb_matrix(), libjxl_get_primaries(), libjxl_populate_primaries(), and png_get_chrm().

Detects which enum AVColorPrimaries constant corresponds to the given complete gamut description.

See also

enum AVColorPrimaries

Parameters

prm A description of the colorspace gamut

Returns

The enum constant associated with this gamut, or AVCOL_PRI_UNSPECIFIED if no clear match can be idenitified.

Definition at line 110 of file csp.c.

Referenced by iccdetect_filter_frame(), libjxl_get_primaries(), and populate_avctx_color_fields().

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)

This function returns the gamma exponent for the OETF. For example, sRGB is approximated by gamma 2.2, not by gamma 0.45455.

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 149 of file csp.c.

Referenced by mov_write_gama_tag(), and png_get_gama().

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 291 of file csp.c.

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