With the release of a lot of high-DPI displays (aka “retina” displays, but also others on both Android and iOS devices), it’s just a truism that images on these displays have tended to not look their best, all the time. High-DPI displays are having to scale up low-resolution images, and it’s just not great.
Anyway, lately we’ve been making those sorts of changes to WordPress.org too. If you’re visiting on a high-DPI display, you may notice that the main header logo is of a higher quality, or you might have noticed that the Showcase looks particularly good, or that we now have some very high resolution images on the Logos and Graphics page. Little changes to the graphics, here and there. It’s an ongoing project to “retina-all-the-things”.
Back in December, we made some changes to allow plugin authors to put banner images above their plugins in the directory, and the response has been great. So, now they get the high-DPI love too.
Plugin authors already have the ability to make a
banner-772x250.jpg or png file in their assets directory and have that be used for the banner image on their plugin listing. As of today, they can add a
banner-1544x500.jpg or png file, for use on high-DPI displays only. When the website detects that the viewing browser both has a high-DPI display and the high-res image exists, then that image will be shown instead of the low-res image, but scaled to fit into the proper space. This makes them look particularly sharp on high-DPI displays.
Now, before you go forth and create, please remember that one thing to keep in mind here is filesize. If you’re using photographic material for your banner, then it is highly recommended that you use the JPG file format. If you’re using drawn or generated materials, PNG is the favored format. However, in either case, you will want to apply high compression and try to keep those files as small as possible. Small files transfer to the browser faster. Also consider that a fair number of high-DPI displays will be phones, for example, and perhaps not using high-speed connections. So keeping that high-res file as small as you can would be a good thing. If you wish to use a PNG compression tool before uploading, that might be a good idea as well.
And there you have it. Plugin authors, go forth, and show us your high-resolution banner skills!
BTW, if you want to see it, I gave my Pluginception plugin a high-res image, for testing. It’s a simple image with some well-defined lines that make the difference easy to spot if you’re looking for it. You’ll need a high-DPI display to see it though.