Quick question.

What DPI would you advise me to scan my photos in at?
I dont want it to look to grainey or the final quality to be poor but on the other hand I dont want them to take ages to scan or open in photoshop unnecessarily

I think any think over 300 is suficient but I cant remember!

Please help me with this if you know, I dont want to have to re scan the whole lot again!

Many thanks