W3C home > Mailing lists > Public > public-device-apis@w3.org > September 2012

Re: Next step for DAP Ambient Light Events

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Thu, 13 Sep 2012 11:13:03 -0700
Message-ID: <CAAWBYDD=dtScLLYyjaOnFunnuLZ8XYh6a=qWA-1=7Vd7EPmHKw@mail.gmail.com>
To: Doug Turner <doug.turner@gmail.com>
Cc: "fremycompany_pub@yahoo.com" <fremycompany_pub@yahoo.com>, "SULLIVAN, BRYAN L" <bs3131@att.com>, Dzung D Tran <dzung.d.tran@intel.com>, François Remy (pub) <fremycompany_pub@yahoo.fr>, Marcos Caceres <w3c@marcosc.com>, Doug Turner <dougt@mozilla.com>, CSS WG <www-style@w3.org>, "public-device-apis@w3.org" <public-device-apis@w3.org>
On Thu, Sep 13, 2012 at 11:03 AM, Doug Turner <doug.turner@gmail.com> wrote:
> On Thu, Sep 13, 2012 at 10:23 AM, Tab Atkins Jr. <jackalmage@gmail.com> wrote:
>> On Thu, Sep 13, 2012 at 10:12 AM, fremycompany_pub@yahoo.com
>> <fremycompany_pub@yahoo.com> wrote:
>>> Would you really want to change the site color’s scheme to high contrast
>>> black and white at only 1000 lux? If Microsoft data are to be believed, I
>>> would set the threshold between 10 000 and 100 000, depending of the screen
>>> brightness and reflectance.
>>> What do you think?
>> Yes, 1000 lux is far too little.
>> "bright" is supposed to mean "direct sunlight, or similarly bright
>> conditions that make it hard to see things that aren't high-contrast".
>>  Based on Wikipedia's lux table <http://en.wikipedia.org/wiki/Lux>,
>> I'd set "bright" to start around 10k lux.
>> Similarly, "dim" is supposed to mean "dark enough that the light
>> produced by a white background is eye-straining or distracting", so
>> 300 is far too high (given that it's roughly office lighting).  I'd
>> have it start at 50 lux or so.
> Okay.  Sounds fair.
> Shall we keep these up to the UA, and put the suggested ranges in
> non-normalized text?

Yes, that appears necessary, due to the variance in actual detected
lux values across devices.

Received on Thursday, 13 September 2012 18:13:52 UTC

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