colour.models.cctf_encoding_ProPhotoRGB

colour.models.cctf_encoding_ProPhotoRGB(X, bit_depth=8, out_int=False)

Defines the ProPhoto RGB encoding colour component transfer function (Encoding CCTF).

Parameters
  • X (numeric or array_like) – Linear data \(X_{ROMM}\).

  • bit_depth (int, optional) – Bit depth used for conversion.

  • out_int (bool, optional) – Whether to return value as integer code value or float equivalent of a code value at a given bit depth.

Returns

Non-linear data \(X'_{ROMM}\).

Return type

numeric or ndarray

Notes

Domain *

Scale - Reference

Scale - 1

X

[0, 1]

[0, 1]

Range *

Scale - Reference

Scale - 1

X_p

[0, 1]

[0, 1]

* This definition has an output integer switch, thus the domain-range scale information is only given for the floating point mode.

References

[ANSI03], [SWG00]

Examples

>>> cctf_encoding_ROMMRGB(0.18)  
0.3857114...
>>> cctf_encoding_ROMMRGB(0.18, out_int=True)
98