I dont think it deletes photos from PhotoStream as a whole, only the PhotoStream that is for that device.
Example: I deleted a photo from my iPad's PhotoStream. It specifically said this photo will only delete from my photostream on my iPad.
I opened my iPhone and confirmed it. Did another test deleting one photo from my iPhone's PhotoStream. Same message popped up stating this would only delete the photo from the Photostream on this iPhone.
So I'm assuming you'll have to manually delete the unwanted photos each time on every device.
Thank you for this information, I will go do a test myself.
You'd think that since it is a stream, it isn't a 'per device' thingy, this feels very 'how windows would do it' rather than how Mr Jobs would demand it to be done.
Let's hope it's a first step towards a more logical approach in the future.
Photo pool per device, Photo stream per iTunes account.
Delete a photo from your device, it deletes it from just that device.
Delete a photo from your stream, it deletes it from ... the stream (ergo, each device the stream shows up on).
At least I can clean up the photo stream first, before showing my photo albums to parents, friends, etc. Rather than having it include 1 good picture and 7 blurry ones. Because they love the device so much, they spend 30 minutes going through all the pictures in every album exploring and playing with the iPad. Having a cluttered photo stream is a no go.
Man if it is per device, that must such for people with a mac pro server, an iMac workstation, several iPhones and iPads in a family, etc. Takes an hour each day cleaning up a creative family using an iTunes account. lol