This thread has been going largely unanswered lately, for one simple reason: The answer has been provided so many times by now, here and elsewhere, that most regulars have given up. Me too, really. Steve, the feature is there. Robert, the issue is fixed. There is nothing more to fix. Photoshop at 100% displays one image pixel represented by one screen pixel. That's 1:1, or 100%. The problem with that, of course, is that screen pixels are much smaller in a retina/4K/UHD display - so the image becomes much smaller than everybody's used to from traditional displays. The exact same thing has happened before, when displays went from 480 pixels to 670 pixels to 1024 pixels to 1600 pixels. With each increase in screen resolution, displayed content gets smaller. Now, 4K is a pretty big leap. So when detecting a high resolution display, what other applications (including web browsers) now do, is to scale everything up, but without telling the customer. They can do that, because they don't have the strict requirements for accurate display that Photoshop has to meet. They now use 4 screen pixels to represent 1 image pixel. But there's a catch: the retina display is just turned into a standard display. All the extra resolution is wasted. Photoshop now has a preference to scale the UI to 200%. So that takes care of that. But what about the image? It's still small at 1:1 pixel ratio. So there's now a similar View > Zoom option: 200%. This is exactly what every other application on the planet does when detecting a high resolution display. But they don't tell you about it. They just turn your high-res display into a perfectly ordinary low-res one. We all understand that for web design, it's important to see the design as most other users will see it. But there really is only one solution to that, and that is scaling up on a retina display. While most other applications do it to everything, UI and image, Photoshop can't do that. When you think about it, that's the way it has to be. A fairly small percentage of PS users do web design. For photography, prepress, illustration and so on, in fact everything that ends up on paper, screen scaling makes no sense whatsoever. So Photoshop offers web designers an option to scale to 200%. It's the next best thing, because using exactly four screen pixels to represent one image pixel shouldn't introduce too much interpolation blur. But you're still wasting all that magnificent extra resolution. --- Now, I don't have much hope for this post to fare any better than the others. But I'll probably keep this as a boilerplate text and paste it whenever the question comes up, which is several times a week.
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