All true, except two things – it’s pixels per inch (dots are for ink), and the browser really does not care about the ppi metadata. It shows pixels. Save the same file at 72ppi or 144ppi or 288 ppi – put them side-by-side as pass-through (or just hand-code it) and you will see two or three identical images. The CSS (what you get when you click the High-resolution check-box) defines what size an image should display at, and the rendering engine in the browser resizes the image on the fly to fit.
Here’s an example to prove the point. View source – and download the images and open them in Photoshop to see what I am talking about here.
http://scripty.walterdavisstudio.com/annie
Walter
On Aug 29, 2016, at 8:30 AM, Thomas Kimmich email@hidden wrote:
It is still 72 dots per inch, but twice the dimension of your image.
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