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

Hi,

The 'from-image' keyword of the 'image-resolution' property is defined as

     The image's intrinsic resolution is taken as that specified by the 
image format. If the image does not specify its own resolution, the 
explicitly specified resolution is used (if given), else it defaults to 
‘1dppx’.

The only image formats that I found that have resolution metadata are 
JPEG and TIFF, where it is specified in "image pixels per inches" or 
"per centimeter".

How should this be interpreted? I think it should map to CSS in and cm 
(and therefore the resolution is interpreted as dpi and dpcm) rather 
than physical inches and centimeters, which otherwise don’t exist in CSS.

-- 
Simon Sapin

Received on Friday, 26 July 2013 12:42:27 UTC