found via "mac preview"Summary
Preview makes it easy to read Portable Document Files (PDFs) and open popular image files (including JPEG, TIFF, and PNG). More than just a file viewer, Preview offers essential editing capabilities, such as resizing, rotation and cropping, and even lets you add annotations to share your comments. Learn how to use Preview to work with your PDFs and image files.
It is a viewer for PDF and such. Also allows you to take screen shots. Those are the two features I use most in Preview.
How does Preview take screenshots?
File->Take Screen Shot
Thanks. Though it is quite cumbersome compared to the keyboard shortcuts to take screenshots.
Is there any reason you can't figure out how to use copy paste from the screenshot within preview?
No, I guess not. I could probably do copy and paste. I was trying to use the screen shot feature instead to see how it works.
When you took the screenshot, the shot screen loads in a new Preview window. Press CMD+A, then CMD+C to copy it.
Or use the shortcuts listed here.