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Re: [css3-images] Units for `image-resolution: from-image`

From: Simon Sapin <simon.sapin@exyr.org>
Date: Wed, 23 Apr 2014 15:38:21 +0100
Message-ID: <5357D05D.20904@exyr.org>
To: fantasai <fantasai.lists@inkedblade.net>, www-style@w3.org
On 17/04/2014 19:09, fantasai wrote:
> On 07/26/2013 09:59 AM, Tab Atkins Jr. wrote:
>>
>> While that's reasonable, still, if you know the size of a "real inch",
>> then you know the ratio of a real inch to a CSS in.  This can be used
>> to interpret the format-specified ratio in a more accurate way than
>> just assuming that it's referring to a CSS in.
>>
>> What I'm saying is, I prefer to leave this underdefined.
>
> I disagree. I think the concept of "inch" should be consistent
> throughout all of CSS if possible. So <length>, media queries,
> and image-resolution.

Yes, the "in" and "dpi" units should be consistent within CSS. But 
neither of them is related to the imperial inch unit.


> In other news, if the image says "I'm 72dpi" and I write
>     image-resolution: 72dpi
> these should both give the same result.

I disagree. I’m pretty sure that "inch" in EXIF refers to the imperial 
unit rather than the CSS "in" unit that is worth 96 times 0.0213 degrees 
of visual angle.

-- 
Simon Sapin
Received on Wednesday, 23 April 2014 14:38:45 UTC

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