On page 154 you are asked to open the resulting image in Preview? Now, what is Preview? :=)

Thanks on advance,



Preview is the Apple PDF/image viewer application.

From the terminal, you can run: open -a Preview /tmp/google.png

Or, you can use Finder or Preview itself to navigate to the file, but that can be tricky.


Getting to hidden folders in the Finder is easy.

Just use the Go menu and select Go To Folder… then type /tmp. Done.

I use the Command-Shft-G keystroke a lot for this too.