Adobe Photoshop CS6 100% Zoom Issue

Question

Adobe Photoshop CS6 Version 13.0.6 x64
OS X Yosemite Version 10.10
100% Zoom is very tiny on my screen. How do I fix?

Answer 1

An Images dpi setting has nothing to do with it.  Its all about the number of pixels you have.    Image for the web have fewer pixels.  It does not matter it you set the image DPI resolution is 72, 300 or any other value when you don't resample the number of pixels remain the same.  When you display actual pixels 100% zoom an image with 10K pixels with a 300dpi is the same 10K pixel image with a 72dpi resolution setting.  Printers will use the images dpi setting to adjust pixel size.  Displays do not they are run at their native DPI resolution whatever that is.  So a 10K pixel image with a 72DPI setting and a 10K pixels image with a 300DPI setting will be displayed as a 10K pixel image at the displays dpi resolution.
DPI defines Pixel size pixel density  300DPI means 90000 square pixels per inch  so the pixel size would be 1/300" x 1/300".  72DPI means 5184 pixels per square inch so pixel size is 1/72" x 1/72"
So if you have an image with 7200px x 7200px and set the dpi tp 72DPI and print it will print 100" x 100" do know of a printer the cal handle 100" paper
So if you have an image with 7200px x 7200px and set the dpi tp 300DPI and print it will print 24" x 24" you need a large form printer that can handle 24" wide paper
This image can not be displayed on a display zoomed to 100% only part of the image will fit you will need to scroll about the image. Unless you have a 34" display with a square aspect ratio with a 300DPI native resolution that I don't know about.