The particular edition of Grande Methode de Trombonne I am working from is a somewhat problematic edition, with a rather light and weak imprint. As a result, a lot of details, such as the beautiful illustrations in the front of the book, were very lacking. I completed manual vector line-art traces of both trombonists in Photoshop, which allows infinite scaling. Some of the fine detail like the width of lines is lost in this process, but the overall result is much cleaner than the original imprint.
The Vobaron Project 