Photoshop displays images smaller than they actually are (at 100%)

Question

Some time ago, when viewing an image at 100%, photoshop would display the image the size it was, but after an update a few years ago, it has been showing images about half the size they actually are. I've ignored it and worked around it, but I'm adding images to a website and I need to size them by eye and I'm tired of sizing an image 3 times, because i have to check how big it actualy is in preview and then guess again at a different size.

I must have a setting wrong somehwhere? Can anyone help? Here is a picture of a simple image in photoshop at 100% and the same file opened in preview right next to it, you can see the file in preview is much larger than photoshop is showing it.

Thanks for any help!

whitney

davescm · Accepted Answer

Photoshop 100% is not a physical size. At 100% zoom, it uses 1 screen pixel to display 1 image pixel. No scaling is involved, which is essential for critically reviewing image quality. So the higher density your screen pixels, the smaller the image appears on screen.
Many viewers and browsers, when using screens with high pixel densities (such as retina screens) scale the image to 200% so use 4 screen pixels to display one image pixel. This makes them look physically bigger on screen. If you want Photoshop to display the same way, use 200% zoom.

Dave

D Fosse · Answer

Dave is exactly right. This 200%-scaling that web browsers and image viewers do, is in fact the accepted industry standard workaround, to ensure that the same material can be used everywhere, regardless of what screen technology the user happens to have. Without this workaround, we'd need two separate internets: one for people with 4K/retina screens, and one for people with standard HD screens.

You should not size up your images! What you need to do is just set Photoshop to View > 200%. Then Photoshop will perfectly match your web browser.

If you want to dig deeper into this, there are ways to code websites so that two images are uploaded, and the browser chooses which one to display based on the screen resolution detected. But that is not something you can control. This has to be built into the site, as a special function, by the website creator.

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