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sRGB EOTF incorrect value for linear section?

See original GitHub issue

sRGB EOTF threshold error?

In colour/colour/models/rgb/transfer_functions/srgb.py in the function “def oetf_reverse_sRGB(V):” V <= oetf_sRGB(0.0031308),

I was thinking this was an incorrect value till I parsed the code more… Now I see that you’re using the oetf_sRGB to create the “inverse”… the specified value per ISO spec is 0.04045 (or the unrounded 0.0404482) … as a thought the following would reduce overhead wouldn’t it? (Or is this solving some other problem? Perhaps a comment indicating the reasons as at first glance it look like the wrong threshold value is in place).

L = np.where( V <= 0.0404482, V / 12.92, spow((V + 0.055) / 1.055, 2.4), )

Issue Analytics

  • State:closed
  • Created 4 years ago
  • Comments:5 (3 by maintainers)

github_iconTop GitHub Comments

1reaction
KelSolaarcommented, Apr 29, 2019

You are welcome! I will close this one but feel free to ask any more questions!

0reactions
Myndexcommented, Apr 29, 2019

Thank you @KelSolaar — I really appreciate the quick tutorial on numpy !

Read more comments on GitHub >

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