Light-colored shades do block more view than dark-colored shades, but I think you will still be able to tell who is in a room with 5% openness based on my experience. Blackout is really the only real blocker, but then you won't be able to see much from inside the room. Shades with a 3% openness factor might work for you. I suggest you have the shade people bring some extra-large samples to show you, not just the sample book.

Please know that solar shades are not meant for privacy. They are what I call "sight to the light." For example, when they are down during the day you will be able to see out, but no one will see in. HOWEVER...at night it is the opposite...you can not see out, but people can see in if there is a light on in the room. My preferred source for solar shades, LAFVB Genesis, offers a dual shade option...solar for view out during the day and a privacy shade for night. You do need considerable depth to install dual shades inside mount. I've used these at a client's lake home, where view is very important, but privacy was a must.