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1993-08-09
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MIDISCAN Ver. 1.0 Release Notes
Musitek. Ojai, CA
Aug. 11, 1993
We are extremely proud of MIDISCAN Version 1.0. Not only does it
prove that this technology is feasible, but that it can also be made
accessible and affordable to practically anyone regardless of
musical training. Please keep in mind that MIDISCAN cannot be
all things to all people. The following list includes caveats,
suggestions, known problems and a preview of things to come in
future MIDISCAN releases:
- MIDISCAN is not designed to recognize handwritten (manuscript)
music. If you choose to process manuscript, you should do so on
well-scored specimens that approximate printed music. HINT: Make
sure the strokes of each character are as "thick" as possible.
- Some "nonstandard" notation may not be satisfactorily
recognized by MIDISCAN. Scores such as those printed in France
in the 19th and early 20th centuries contain characters that
MIDISCAN does not recognize.
- When processing smaller-sized scores at resolutions higher
than 300 dpi, results can be unpredictable. Our tests suggest
the maximum resolution for MIDISCAN 1.0 is around 350 dpi
although you may have some success at higher resolutions. Try
enlarging the original on a copy machine first. If the width of the
enlarged score exceeds the width of your scanner, rotate the copy
90 degrees and make two scans for each page. Then re-rotate (normalize)
the image in MIDISCAN using Edit TIFF>Rotate Left (or Right).
- When scanning poorly-printed music, adjust the image in your
scanning software to maximize data acquisition. Increasing the
"darkness" improves faint images. Try to avoid introducing too
much "salt and pepper" into the image from excessive darkening.
HINT: Make a good, high contrast copy on a copy machine before
scanning.
- The timing of the final MIDI file is directly related to the
layout of its associated MNOD file. In some cases, errors in
timing will result if the MNOD file reflects the original music
exactly. This is due to the "flexibility" in notation practices
used by scorers and publishers. For example, notes of a chord
(such as whole notes) may be offset from the rest of its cluster
for readability. MIDISCAN may interpret these offset notes as
NOT belonging to the adjacent cluster. During MIDI Conversion,
"vertical events" are constructed. Objects which are aligned
vertically TEND to be grouped into the same simultaneous MIDI
event (unless their durations suggest otherwise). A vertical
event is no bigger than twice the width of a note head. HINT:
When editing the MNOD file, "stack" objects belonging to chord
clusters vertically. When inserting notes and rests of multiple
voice lines, make sure all objects which need to occur
simultaneously are aligned as vertically as possible (within the
boundary of a "vertical event").
- Creating a series of chord clusters in MNOD is very fast once
you know this trick:
First chose the proper note duration in "Single-note mode" and
drop only the TOP note of each chord. Don't even try to fix
wrong pitches at this point. That can be done in the next step.
When the top note of each chord in the series has been created,
go to "Cluster mode". Begin dropping the remaining notes with
INSERT (F5) active. In Cluster mode, each note inserted assumes
the duration of the cluster to which it attaches. If a note's
pitch is wrong, select CHANGE (F6) and move the note up or down.
- Selecting a background color for the TIFF window may result in
its inverse color if your TIFF file was inverted by MIDISCAN.
TIFF files created by your imaging applications will assign one of two
different "polarities" (1=black OR 0=black). MIDISCAN "reads" each
imported TIFF file and inverts it if necessary to display a
black-on-white image. If the menu selection, Edit TIFF>INVERSE IMAGE,
is checked, then MIDISCAN has inverted the image and selecting a
background color will result in the inverse of the selected color.
The background color of the MNOD window will not be affected.
- For a MIDI file to be played through a sequencer, it must
contain a time signature. Ensure your MNOD file contains a time
signature in the first measure of each stave in the first system
prior to MIDI Conversion. MIDISCAN will globally assign a
uniform time signature if you select Edit MNOD>Unify Time
Signature. As long as there is at least ONE time signature
anywhere in the first system, the remaining measures of the MNOD
file will be assigned that time signature. Unify Key Signatures
uses the same rule as above, but for MIDI purposes, no time
signature is assumed to be the key of C maj / A minor.
- In MIDI Setup, there is a Balance feature that is not
documented in the user manual. This feature will work only with "piano"
scores, that is, ensemble scores containing two staves per system.
"Hard" will assign a pan value of 0 to Channel 1 and 127 to Channel 2.
"Soft" will assign a pan value of 30 to Channel 1 and 100 to Channel 2.
"Middle" will assign a pan value of 64 to both Channels 1 and 2.
- Some MIDI files imported into Passport's EncoreTM may only
play up through the first measure before stopping. This is
related to the way Encore interprets MIDI "clock" values. This
will occur infrequently, but if it does, go to File>Select All
in Encore, then go to Change>Time Signature. Select the proper
time signature (even if the original is exactly the same) and
apply it.
- Do not toggle to any other open applications during the
recognition process. (This includes Skew Calculation / Staves
Localization and Recognition). To ensure all of your processor's
resources are allocated to recognition, it may preferable
(especially with limited RAM) to close any open applications
before the recognition sequence begins.
- Future Releases of MIDISCAN
Musitek will release periodic upgrades of its products free of
charge to registered users. Major product releases will be made
when significant changes in functionality are implemented.
Registered users will be allowed to upgrade to major new
releases at a nominal charge. All releases, whether periodic or
major, are made at the discretion of Musitek. Your comments and
suggestions are invited, but final implementation of features
will remain at the discretion of Musitek.
MIDISCAN for Mac is under development and should become
available in the first half of 1994. Major improvements to
MIDISCAN for Windows within the next year will include:
- Support for printing of MNOD files (Save your .MND files!).
- A sequencer will also be added so that MIDI files can be played back
within the application.
- Full TWAIN support allowing you to scan in your images directly
from MIDISCAN.
Thank you for your purchase of MIDISCAN.