Mobos wrote I have a new computer |
...with a retina display! Read a little about how screen resolution affects physical size on screen.
Photoshop is in fact right. It always displays 100% as one image pixel represented by one screen pixel. That's the correct way to do it; the very definition of 100% in a raster image editor. But you can set it to View > 200%, and you get the same size if that's what you want.
It is the native Mac OS apps that compensate for the retina display by scaling images up. One image pixel is now represented by no less than four screen pixels. They can do that - they have no obligation to display accurately.
They do this so that images will display at roughly the size people are used to from traditional displays - in order to avoid complaints like yours here.
Photoshop is a professional-grade image editor and has to do it right.