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This is a classic and there's a million posts about this.
Photoshop at 100% maps one image pixel to exactly one screen pixel. This is how a critical raster image editor has to do it. On a retina display these screen pixels are small because there's a lot of them.
Consumer-oriented photo viewers, web browsers and so on, don't have these requirements for accurate display, and so they scale the image up, so that it has roughly the same physical on-screen size that people are used to from traditional displays.
Given the small pixel size, Photoshop is right and the others wrong.
See D Fosse's reply... Also worth noting that I have seen a lot of posts about mac's causing additional blurry issues etc by also having an older OS version...
Thanks for the explanation. Do you have any topic suggestions for a solution to this problem?
I'm not a pro at cc 2017, but would like to know how to make basic edits to images in terms of resizing and making images for web browsers/various image viewing programs.
View at 200% in Photoshop.
It will get automatically scaled to 200% in your browser/viewer.