B. Resolution VS Format
Before defining the final resolution (DPI) of the piece to scan, we must take into account the sheet music format.
A3 sheet music (at 300 DPI) contains the same exact number of pixels as A4 sheet music (at 600 DPI). In other words, the smaller the sheet music, the larger resolution (DPI) you will need in order to capture all the small details.
Interestingly, Michael Ferraguto – Principal Librarian at Baltimore Symphonic Orchestra – tells us that the difference in quality between 200 DPI and 300 DPI seems more important than between 300 DPI and 600 DPI. He adds that going beyond 600 DPI does not offer much advantage for the purpose of viewing, printing, or archiving.
That said, if you are scanning a piece in order to make some edits in Photoshop or any other digital editor, you’ll need a resolution of 600 DPI.