[RFC wayland-protocols 1/1] unstable: add color management protocol

[Sebastian Wick]

Thanks. I don't really know about all the standards so I'll just trust 
you on this.

On 2019-02-14 05:47, Chris Murphy wrote:
> On Wed, Feb 13, 2019 at 7:55 PM Sebastian Wick
> <sebastian at sebastianwick.net> wrote:
> 
> 
>> +      <entry name="absolute" value="1"/>
> 
> I suggest ICC spec language.  'ICC-absolute colorimetric'
> 
>> +      <entry name="relative" value="2"/>
> 
> 'media-relative colorimetric'
> 
> 
>> +      <entry name="none" value="0" summary="no known color space" />
> 
> I think this is 'deviceRGB' although it could be 'unknown'.
> Practically, it could only be unknown if the values aren't being
> displayed or output anywhere. The instant RGB values are displayed
> anywhere, the color space is knowable, therefore it's at least
> deviceRGB. But unknown is also consistent with EXIF.
> 
> And 'color space' can be assumed.
> 
>> +      <entry name="sRGB" value="1" summary="sRGB color space" />
> 
> Summary probably should be 'sRGB IEC61966-2.1' and again 'color space'
> can be assumed.
> 
>> +      <entry name="adobeRGB" value="2" summary="Adobe RGB" />
> 
> Summary probably should be 'Adobe RGB (1998)'
> 
>> +      <entry name="DCI-3P" value="3" summary="DCI-3P" />
> 
> DCI-P3
> But there are three, so it needs to be specific which one or define
> all three. And there's a variant, which is 'Display P3' from Apple,
> which starts out being defined with DCI-P3 D65 but uses a tone
> response curve defined by the sRGB curve.
> 
> 
>> +      <entry name="rec2020" value="4" summary="rec2020" />
> 
> Probably the summary should be 'ITU-R BT.2020 for UHDTV' same for 
> below.
> 
>> +      <entry name="rec2020-pq" value="5" summary="rec2020 with pq 
>> curve (HDR)" />
>> +      <entry name="rec2020-hlg" value="6" summary="rec2020 with HLG 
>> curve (HDR)" />
> 
> It's reasonable to add 'ITU-R BT.709 for HDTV' or Rec. 709 since
> that's used today still.
> 
> 
> --
> Chris Murphy
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