Don't bother.
OK, I'll go into more detail: there's only one free application that's currently being developed, Audiveris. OpenOMR (Optical Music Recognition) hasn't been updated since 2013 and there's no available documentation.
I tested using a PDF I downloaded of Darius Milhaud's Suite for Clarinet, Violin and Piano, Op 157b. Specifically, the third movement, "Jeu," which is just a clarinet and violin duet. It's not an exceptionally high-quality PDF, but it's not terrible. My scanner is an Epson WF3530 which easily meets the hardware requirements for Audiveris.
Audiveris likes 300dpi JPG images -- I couldn't get it to work with other file formats and higher-resolution scans didn't make any difference. The result was ... it scanned the name of the piece right. (I can't find my screenshots. Sorry about that. I think I have them on my work PC. The program is very difficult to install and I really don't want to reinstall on my home computer.)
So, I tried a trial of the top-of-the-line $400 Musitek SmartScore X2 Professional Edition. It likes 470dpi BMP images, which my scanner can easily handle. The result was better than Audiveris, but nothing to write home about. Here are a couple screenshots. The top yellow part is the scan, the bottom white and pink part is the SmartScore interpretation. Double-click to enlarge.
I think it's possible that if I had a very large-print score and/or I had one that had exceptionally clear type, it'd come out OK in SmartScore or even Audiveris. I also think that I could probably tweak a bunch of settings and make things better, but I could also spend about an hour and a half playing the parts into my computer through my MIDI keyboard and get a perfect result. Which is what I eventually did. Also, Audiveris is supposed to be getting an update to "support even poor-quality scores." Unfortunately, it looks like the last updates are over a year old, so I wouldn't hold my breath.
If you do want to try scanning in music, there are a lot of companies that have music OCR packages. I strongly recommend that you download their trial copies and test really, really hard before you buy.
OK, I'll go into more detail: there's only one free application that's currently being developed, Audiveris. OpenOMR (Optical Music Recognition) hasn't been updated since 2013 and there's no available documentation.
I tested using a PDF I downloaded of Darius Milhaud's Suite for Clarinet, Violin and Piano, Op 157b. Specifically, the third movement, "Jeu," which is just a clarinet and violin duet. It's not an exceptionally high-quality PDF, but it's not terrible. My scanner is an Epson WF3530 which easily meets the hardware requirements for Audiveris.
Audiveris likes 300dpi JPG images -- I couldn't get it to work with other file formats and higher-resolution scans didn't make any difference. The result was ... it scanned the name of the piece right. (I can't find my screenshots. Sorry about that. I think I have them on my work PC. The program is very difficult to install and I really don't want to reinstall on my home computer.)
So, I tried a trial of the top-of-the-line $400 Musitek SmartScore X2 Professional Edition. It likes 470dpi BMP images, which my scanner can easily handle. The result was better than Audiveris, but nothing to write home about. Here are a couple screenshots. The top yellow part is the scan, the bottom white and pink part is the SmartScore interpretation. Double-click to enlarge.
I think it's possible that if I had a very large-print score and/or I had one that had exceptionally clear type, it'd come out OK in SmartScore or even Audiveris. I also think that I could probably tweak a bunch of settings and make things better, but I could also spend about an hour and a half playing the parts into my computer through my MIDI keyboard and get a perfect result. Which is what I eventually did. Also, Audiveris is supposed to be getting an update to "support even poor-quality scores." Unfortunately, it looks like the last updates are over a year old, so I wouldn't hold my breath.
If you do want to try scanning in music, there are a lot of companies that have music OCR packages. I strongly recommend that you download their trial copies and test really, really hard before you buy.
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