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Re: [css3-images] 'image-resolution: from-image' based on resolution X / Y

From: Simon Sapin <simon.sapin@exyr.org>
Date: Fri, 26 Jul 2013 17:43:37 +0100
Message-ID: <51F2A739.5070400@exyr.org>
To: www-style@w3.org
Le 26/07/2013 17:34, Tab Atkins Jr. a écrit :
> On Fri, Jul 26, 2013 at 7:36 AM, Simon Sapin <simon.sapin@exyr.org> wrote:
>> Hi,
>> In TIFF and JPEG (EXIF), the resolution metadata can be specified as two
>> fields: Resolution X and Resolution Y. Although I expect the two to be the
>> same (when set at all) in most real images, what should a UA do when they’re
>> different? 'image-resolution: from-image' expects a single value.
>> I think there is no good answer to this, but I dislike leaving it undefined.
>> I suggest specifying something arbitrary. For example:
>>      If the image specifies two different resolutions for the horizontal and
>> vertical direction, the average of the two values is used:
>>      <code>(horizontal + vertical) / 2 <code>
> I didn't realize this was even possible!  We could either allow
> image-resolution to take two values, or decide on how to merge two
> values into one.
> I'm okay with ignoring one of the dimensions, but is there one we
> should prefer?  Liam suggests that horizontal resolution is more
> important to preserve, at least for images containing text.

Ok, I’m convinced that averaging is terrible :)

I’m in favor of allowing two values (including specifying two in CSS.) 
If the WG rejects that, use the horizontal one.

Simon Sapin
Received on Friday, 26 July 2013 16:44:00 UTC

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