Image size reported as good, but it's not

[nhoizey]

For example on this page: https://nicolas-hoizey.com/2017/01/how-much-data-should-my-service-worker-put-upfront-in-the-offline-cache.html

When using a viewport width of 614px, it says the screenshot from WebPagetest is at the right dimensions (natural 551x394), but when I use the console to get the currentSrc, it shows that the image is 980 pixels wide:

[andydavies]

@nhoizey Presume you're on a retina mac of some sort?

The natural width property allows for pixel density

[nhoizey]

@andydavies on a Retina MacBook indeed, but the window was on a non Retina external screen.

[simonhearne]

Confirmed that the correct image is being sent and detected on a retina display.
naturalWidth accounts for DPI, as does cloudinary.
Can you check the natural size as given in devtools?

[simonhearne]

Actually client hints isn't in play so Cloudinary isn't doing anything clever with DPI, just srcset.

[jamiecoombs]

In any case, we probably need to add a glossary somewhere in the extension so it's clear what the numbers mean.

[tabanliviu]

@nhoizey can you look if this is still an issue with the 1.5.0 release? thanks

[nhoizey]

@tabanliviu sorry for the late answer, the result is almost the same.

currentSrc tells me the image loaded from Cloudinary is 670 pixels wide (I've changed my settings, that's why the size is different).

So why is Image coverage: 1.0x? Shouldn't it be 1.213x (670 / 552)?