macos - What should the file permissions be for files in the Pictures folder on Mac?

I have a mac book pro running Yosemite.
The Photos application shows images but when I double click them I get a dialog that says Photos is not able to locate the file and asks me to select the location of the image file.
When I go to the folder where the file is and try to select it the files are all greyed out.
I reckon it is a file permissions issue, so what should be the file permissions for files in the Pictures folder on mac?