Apple and Arqade both have some community ads that are twice the usual size — specifically 440 x 500 pixels. Apparently these work, and are for improved display on Retina screens.

Do all Stack Exchange sites support these double-size ads? In addition to Community Ads, will they work in Stack Overflow's Open Source ads?

I suspect they might, but there's enough site-specific special case features across the network that I'm not sure. I'm looking for something conclusive, like a staff response or a link to something from staff.

  • My assumption would be yes. It wouldn't make much sense to special case the retina sizing for just two sites, and I believe it worked from the start in Arqade. – Kevin Brown Jan 21 '15 at 0:10
  • @KevinBrown That's my suspicion too, but there's plenty of network precedent for all kinds of site-specific special case features: Role-playing Games has dice in its chat rooms as an easter egg, Board & Card Games has chess boards and magic [mtg:cardname] links, Mathematics and other sites have mathtex parsing, etc. Maybe similarly only some of the sites have retina ads. – doppelgreener Jan 21 '15 at 0:13
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    The number-of-bounties ad works on Mathematics too, and we did nothing special to put it there other than posting in the Ads thread. – user259867 Jan 27 '15 at 0:24
  • An official♦ answer to this would be great, downvotes have already started to fall on High DPI ads, with comments that double size is not explicitly OK. – Nicolas Raoul Jan 17 '16 at 5:30
  • @NicolasRaoul RPG.SE just got a new round of community ads which explicitly allows double sizing: "The image that you create must be 300 x 250 pixels, or double that if retina." This might become not an issue in a year! :D – doppelgreener Jan 17 '16 at 5:32
  • @doppelgreener: The biggest of them all does not say "or double that": meta.stackoverflow.com/questions/314722/… – Nicolas Raoul Jan 17 '16 at 5:35
  • @Nicolas Oof. Looks like someone's asked for that to be clarified at least. – doppelgreener Jan 17 '16 at 5:47

The source of the page around the community advert is:

<img width="220" height="250" title="How to be a Programmer by Robert L. Read"
 alt="How to be a Programmer by Robert L. Read" src="http://i.stack.imgur.com/spkcb.png"/>

While the original image is a 440 x 500 image:

when this is put within the constraint of the img tag above, it becomes:

The web browser itself handles the scaling. If the scale is not an integer multiple of the base size or not the same for the x scale and y scale, it will look funny. This isn't anything site specific - but rather "it works because there is nothing funny going on."

However, as long as it's the proper size it looks ok.

It's not that Stack Exchange supports (or doesn't support) retina graphics but rather the browsers support it already. Even this ghastly IE 10 or Firefox 3.6 that I happen to be stuck with on this machine - it works.

The biggest challenge for the people creating the images is the size of the image fitting within the size (you don't want the image to take too long to download - and yes, you'll note that the image above is quite simple).

With that background, from the staff I will point you to the comments of this advert. The advert started off with one that was a bit askew to start with and later corrected (and another retina scale image).

@JimmyHoffa The display part forces it to 220x250. If its double size, it scales nicely (and high res screens show it nicely). If it's not the right size, it scales funny. You could make it 440x500 and it would work nicely. – MichaelT Jan 1 at 22:54

For the record: nobody manually adds these ads into the system. It's all automated, so unless the ad is sized correctly, as @MichaelT points out, it'll just look weird. – Anna Lear♦ Jan 2 at 1:21

Thus, by implication, a 440x500 image is sized correctly.

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    I will add that I know very little about how our ads work. :P But proportional scaling that maintains aspect ratio is a thing on the web, so the ads will at least not appear malformed. – Adam Lear Feb 19 '15 at 4:07
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    @AnnaLear Is that an official answer? If yes, could you make it one? If not, is there someone else to make one? It still causes a lot of confusion :-( Thanks a lot! – yo' Feb 26 '15 at 2:34

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