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

Le 26/07/2013 16:55, Simon Sapin a écrit :
> Le 26/07/2013 16:06, Florian Rivoal a écrit :
>> On Fri, 26 Jul 2013 16:36:38 +0200, Simon Sapin <>
>> 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>
>> Wouldn't stretching the image along one dimention to make both resolution
>> equals match the original meaning best?
> Thanks for your response.
> There isn’t a good answer for mapping two values into one but you’re
> right, we could also change 'image-resolution' to take two values.
> It is additional complexity with only small use cases. I like it, but
> I’m a bit hesitant given that this property is already add at-risk.

FWIW, 'image-resolution' is the only way to use high-resolution images 
in the 'list-style-image' or 'content' properties.

Simon Sapin

Received on Friday, 26 July 2013 16:14:36 UTC