Re: COLRv1 to gray/alpha question (& color-blindness question)

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Re: COLRv1 to gray/alpha question (& color-blindness question)

From:	Alexei Podtelezhnikov
Subject:	Re: COLRv1 to gray/alpha question (& color-blindness question)
Date:	Wed, 19 Jul 2023 10:27:00 -0400

Hin-Tak,

This is probably both a spec question & a technical question. What is the recommendation for COLRv1 when the rendering target media is not capable of color?

Are you asking about RGB to gray conversion? There are multiple specs with slightly different formulas and barely noticeable differences, with and without gamma correction. I’m is all pretty arbitrary without settled consensus.

Gray = 0.3R + 0.6G + 0.1B

is good enough.

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Re: COLRv1 to gray/alpha question (& color-blindness question), (continued)
- FT_Bitmap and FT_BitmapGlyph life cycles (Re: COLRv1 to gray/alpha question (& color-blindness question), Hin-Tak Leung, 2023/07/19
  - Re: FT_Bitmap and FT_BitmapGlyph life cycles, Werner LEMBERG, 2023/07/19
    - Re: FT_Bitmap and FT_BitmapGlyph life cycles, Hin-Tak Leung, 2023/07/19
    - The COLRv1 hook code (Re: FT_Bitmap and FT_BitmapGlyph life cycles), Hin-Tak Leung, 2023/07/20
    - Re: The COLRv1 hook code (Re: FT_Bitmap and FT_BitmapGlyph life cycles), Brad Neimann, 2023/07/20
    - Re: The COLRv1 hook code (Re: FT_Bitmap and FT_BitmapGlyph life cycles), Hin-Tak Leung, 2023/07/20
    - Re: The COLRv1 hook code, Werner LEMBERG, 2023/07/20
- Re: [MPEG-OTSPEC] COLRv1 to gray/alpha question (& color-blindness question), Laurence Penney, 2023/07/19
- Re: COLRv1 to gray/alpha question (& color-blindness question), Alexei Podtelezhnikov <=
  - Re: COLRv1 to gray/alpha question (& color-blindness question), Hin-Tak Leung, 2023/07/19
    - Re: COLRv1 to gray/alpha question (& color-blindness question), Alexei Podtelezhnikov, 2023/07/19
    - Re: COLRv1 to gray/alpha question (& color-blindness question), Hin-Tak Leung, 2023/07/20
    - Re: COLRv1 to gray/alpha question (& color-blindness question), Alexei Podtelezhnikov, 2023/07/20

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