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Re: [Bug 26526] Fix aspect ratio constraint

From: Stefan Håkansson LK <stefan.lk.hakansson@ericsson.com>
Date: Thu, 11 Sep 2014 17:55:05 +0000
To: cowwoc <cowwoc@bbs.darktech.org>, "public-media-capture@w3.org" <public-media-capture@w3.org>
Message-ID: <1447FA0C20ED5147A1AA0EF02890A64B1D064EA7@ESESSMB209.ericsson.se>
On 2014-09-11 19:48, cowwoc wrote:
> On 11/09/2014 12:21 PM, bugzilla@jessica.w3.org wrote:
>> https://www.w3.org/Bugs/Public/show_bug.cgi?id=26526
>>
>> Jan-Ivar Bruaroey [:jib] <jib@mozilla.com> changed:
>>
>>              What    |Removed                     |Added
>> ----------------------------------------------------------------------------
>>                    CC|                            |jib@mozilla.com
>>
>> --- Comment #3 from Jan-Ivar Bruaroey [:jib] <jib@mozilla.com> ---
>> I think the existing epsilon covers inaccuracies in double just fine, and that
>> arguments to change it were in the opposite direction, chasing the problem of
>> interpreting expectations correctly of people entering decimals by hand.
>>
>> I believe Harald proposed 1/1000 [1], and I indicated perhaps 1/100 as being
>> better, citing wikipedia [2] as evidence that accuracy-needs on aspect don't
>> rise with higher resolutions.
>>
>> [1] http://lists.w3.org/Archives/Public/public-media-capture/2014Aug/0056.html
>> [2] http://lists.w3.org/Archives/Public/public-media-capture/2014Aug/0084.html
>>
>
> I believe your reasoning is still flawed. You shouldn't evaluate the
> "goodness" of an epsilon by looking at a handful of resolutions as
> you've done. You need to evaluate the epsilon against the entire
> resolution space from 1x1 through 16k.
>
> For example, what happens when a user asks for an aspect ratio of 8/12?
> He might be aiming for 800x1200 but you'll give him 788x1200 for an
> epsilon of 1/100. That's a huge error margin.

I agree, and I think we could go with Cullen's proposal, i.e. the spec 
default (which currently means 1e-10. Everyone has a calculator at hand 
I believe, so getting 10 decimals should not be hard.

Received on Thursday, 11 September 2014 17:55:32 UTC

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