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Expert settings allow the user to override the
automated settings of PDFtoMusic Pro up in order to
improve recognition of one or several documents.
You'll intervene directly on the internal algorithms
of PDFtoMusic Pro.
By default, PDFtoMusic Pro is set to mean values,
that work well for most of the PDF files. But for
some specific files, these settings can lead to
errors, that you can fix from here.
This needs a good knowledge about how PDFtoMusic
Pro processes PDF files. Please only change one
value at a time, and apply slight changes.
But don't panic, you can restore the default values
at any time by clicking the "Reset" button.
These settings are applied when the PDF document is
loaded, so they don't affect the documents already
in memory.
The miscellaneous sections are provided in a precise
order: the sequence used by PDFtoMusic to analyze a
document.
For instance, concatenation of characters to build
words is performed before analyzing words.
For each section, a complexity level is provided,
from low to high.
Before applying changes to a section of high
complexity level, please reflect deeply...
Quick Links
Editing
settings
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The first time you ask for
expert mode settings, you are asked for a
confirmation.
Then you see this dialog box:
At the left of this window is
the menu of various expert mode options. Each
section is described in detail later in this
chapter. If a value from a section has changed
from the default value, a star icon is displayed
before the section name.
On the right, sliders that enable to change a
value. Double-clicking the numeric value edits
its value as a text. If the value is
different from default, the offset is displayed
on the right.
At the bottom, several buttons:
Default
Defines current expert settings as the default
values for PDFtoMusic Pro calculation. To be
used with great care.
Reset
Resets expert settings to their original
value for the current section only, or for all
sections.
Load
Loads an expert setting definition file,
previously saved through the "Save" option. This
affects all sections.
Save
Save all expert settings in a definition file.
This enables you to create predefined sets of
parameters.
<< and >>
Switches from one section to another, you can
also click in the section list.
Please note that if you change one or several
expert settings, when running PDFtoMusic Pro, an
alert will be displayed to alert you that you'll
process PDF files with different parameters than
the default.
In the same way, when you send an e-mail to the
technical support (Internet menu), all the
parameters that have been changed are attached,
so that we can work on your files with the same
settings as yours.
Horiz.
&
vert.
lines
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Complexity : high
Horizontal and vertical lines are an essential
element, and the first step in analysis.
They form staff lines, barlines and note stems that
constitute the document's backbone.
Line analysis is performed before staff seeking, so
units are pixels.
If some staves appear to be missing after analysis,
altering these settings could help.
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A score
excerpt
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What
PDFtoMusic Pro detects
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Horizontal imprecision for line merging (in
pixels)
When lines are actually made of several small
lines end to end, increasing this value will enable
a more tolerant merging of these lines.
Vertical imprecision for line merging
(in pixels)
Some thick lines are actually made of several thick
lines, drawn on top of each other. Increasing this
value will enable a more tolerant merging of these
lines.
Minimum line size for dust removal (in pixels)
Small useless lines are sometimes found, which can
be removed with this setting.
Staves
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Complexity : high
Once horizontal lines have been detected, PDFtoMusic
Pro will try to determine staves: a set of more or
less equidistant horizontal lines, with end
positions rather close.
Once staves have been extracted, the document
general unit is known: the "line space", i.e. the
distance between two horizontal lines in the same
staff.
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Detected
horizontal and vertical lines
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Detected staff
lines
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Horizontal imprecision for staff lines
connection (in pixels)
Maximum tolerance for merging two lines drawn end to
end into a single one.
Vertical imprecision for staff lines (in
pixels)
Maximum tolerance for merging two lines drawn on top
of each other in a single, thicker one.
Maximum line thickness (in pixels)
Enables to remove too thick lines. If you see, on
your document, undetected staves with rather thick
staff lines, increase this value.
Maximum line space (ratio of the page height)
Lines which are too far apart in your document
can be removed with this option. If staves with
rather outspread staff lines go undetected, as can
occur in tablature, increase this value.
Be careful, too much tolerance will detect staves
where there are none.
Minimum horizontal size for staff lines (ratio
of the page width)
Lines which are too short can be removed with this
option. For instance, one or two measures, or even a
whole paragraph of underlined text might be
drawn as an embellishment, and do not match the
actual content of the score. Or, for instance, a
whole paragraph of underlined text
Line space imprecision (in line spaces)
This value sets the calculation tolerance when
searching for equidistant horizontal lines. On some
PDF files generated with a low resolution,
horizontal lines of a staff are not regularly
spaced.
Slanted
lines
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Complexity: average
Slanted lines are mainly used to draw beams,
hairpins or tuplet groupings.
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A score
excerpt
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In red, what
PDFtoMusic detects
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Imprecision for slope comparison
Increasing this value will enable slanted lines with
more different slopes but drawn end to end to be
merged together.
Horizontal imprecision for line merging (in
line spaces)
Vertical imprecision for line merging
(in line spaces)
Increasing these values will allow two lines of
similar slope on top of each other to be merged
together in order to make a thicker line.
Vertical distance for line end comparison (in
line spaces)
Increasing this value will enable slanted lines that
are not perfectly end to end to be merged together
in order to make a longer line.
Thickness imprecision for slanted line merging
(in line spaces)
Prevents slanted lines from merging if they meet all
the above requirements but their thickness is
different.
Dust removal on slanted lines: Minimum allowed
size (in line spaces)
Small useless lines are sometimes found, which can
be removed with this setting.
Systems
&
groups
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Complexity: average
Staves have now been found, as well as slanted
lines. PDFtoMusic Pro will aggregate staves into
staff groups. Vertical lines or brace and bracket
symbols located in the left margin are extracted.
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A score
excerpt
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What
PDFtoMusic Pro extracts:
A three staves system.
The two bottom staves are grouped into a
single part by the brace.
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Horizontal imprecision for system seeking (in
line spaces)
In some documents, the grouping symbol is either far
from the left end of the staff, or within the staff
area. This setting determines the maximum distance
in line spaces.
If this value is zero, each staff becomes an
independent system.
Vertical imprecision for system seeking
(in line spaces)
The maximum distance between the end of the grouping
symbol and the top or bottom of the staff.
Barlines
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Complexity: average
Once staves have been grouped together, PDFtoMusic
Pro will locate vertical lines that start at the top
of the system or staff, and end at the bottom of the
system or staff, in order to extract barlines.
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a) thick barline
b) thin barline
c) double thin barline
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Minimum thickness for a thick barline (in line
spaces)
Specifies at what point a barline should be defined
as thick.
If, for instance, repeat barlines are not
recognized, decrease this value.
Conversely, if too many bold barlines are
recognized, increase this value.
Minimum distance between two thin barlines (in
line spaces)
Sometimes, a barline is drawn several time at the
end of the measure in the PDF file. Increasing this
value will replace double barlines with single ones.
Minimum measure width (ratio of the staff
height)
Measures are supposed to contain symbols, so they
should be wide enough. But some measures can be
narrow (upbeat for instance). Decrease this value if
several narrow measures are merged into one.
Clef
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Complexity: low
Once staves have been grouped together, and measures
detected, PDFtoMusic Pro will begin to interpret the
individual symbols. It starts with clefs.
Minimum height for a clef symbol (in line
spaces)
Minimal symbol height to consider it as a valid
clef.
Minimum height of a 8 or 15 over clef (in
line spaces)
Minimum height for considering a clef octave offset
(8va, 8vb, 15ma...) as valid.
Maximum height of a 8 or 15 over
clef (in line spaces)
Maximum height for considering a clef octave offset
(8va, 8vb, 15ma...) as valid.
Time
signature
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Complexity: low
Unabbreviated time signatures can easily be taken
for miscellaneous numbers like tuplets or fingering.
The following settings allow time signatures to be
more accurately interpreted in these cases.
Vertical parting position between time
signature numerator and denominator (ratio)
Determines how much line spacing is allowed between
the numerator and denominator to be considered part
of the same time signature object. This is expressed
as a percentage (ratio) of the character height.
Minimum size for time signature numbers
(in line spaces)
Numbers (digits) below this size threshold are not
considered to be part of the time signature.
Maximum horizontal shift between time signature
digits (in line spaces)
When numbers are made of several digits, this
setting defines the maximum horizontal distance
between them.
Notes
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Complexity: low
It's now time to detect notes that are drawn on the
staff...
Maximum size of a grace note head (in line
spaces)
Adjusts discrepancies between grace note and regular
note size.
Notes are always bigger than grace notes on the same
document.
However, this difference is sometimes small. If
grace notes are mistaken for notes, decrease this
value.
Maximum size of a grace note drawn in one
symbol (in line spaces)
When grace note head, stem and flag is drawn through
a single character, maximum size of this character
Maximum distance from the flag to the note (in
line spaces)
Flags which are too far from the notehead can be
removed.
See also: "Dots" section.
Ledger
lines
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Complexity: low
Some notes are drawn outside the staff line area. To
relate them to the right staff, but also to show
clearly their degree, small horizontal lines are
drawn between the notehead and the staff.
Maximum size of a ledger line (in line spaces)
Ledger lines wider than the specified value will be
ignored.
Maximum horizontal distance between notehead
and the ledger line (in line spaces)
Maximum vertical distance between notehead and
the ledger line (in line spaces)
The notehead is supposed to be more or less centered
on the ledger line. These settings enable to adjust
this tolerance.
Accidentals
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Complexity: low
Accidentals are related to notes. However, when a
key change occurs, similar symbols are displayed
before notes but are defining the new key value.
Changing these settings can lead PDFtoMusic to
consider note accidentals as a key change, or vice
versa.
Maximum vertical distance between accidental
and notehead (in line spaces)
If the accidental is verticaly too far from the
notehead center, it's not taken into account. This
setting has rarely to be adjusted. (a)
Maximum horizontal distance between the right of
the accidental and the left of the notehead (in
line spaces)
When notes are in a chord, the accidental may
have to be shifted left in order to avoid
overlapping. Increasing this value will tend to
relate the accidental to the note instead of a key
change. However, more complex algorithms try to keep
consistency in the results provided by this setting
(b)
Special cases can be solved by adjusting this value,
as in this example:
Where accidentals are drawn far
away from the noteheads.
In the same way, in a chord, accidental placement
follows a logical scheme. Increasing this value will
make PDFtoMusic Pro search for accidentals farther
from the noteheads (c).
Stems
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Complexity: low
Finding proper stems is crucial because it
determines both note duration and chords.
Indeed, the note will be linked to beams and flags
through its stem.
Maximum horizontal distance between the notehead
and the stem (in line spaces)
Vertical lines drawn too far from the notehead
won't be taken into account. (a)
Maximum thickness of a stem (in line spaces)
Vertical lines thicker than this value won't be
taken into account. (b)
Minimum size of a stem (in line spaces)
Smaller vertical lines won't be taken into account.
In certain documents, notes are drawn with very
short stems. It will then be necessary to decrease
this value. (c)
Minimum size of a grace note stem (in line
spaces)
Smaller vertical lines won't be considered as grace
note stems.
Maximum size of a stem (in line spaces)
Longer vertical lines won't be taken into
account. (c)
Rests
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Complexity: low
The main problem with rests is to recognize whole
rests. It is indeed a very basic shape (a rectangle)
that can be confused with an horizontal beam or a
tenuto symbol for instance. The following settings
will help to differentiate.
Minimum width of a whole rest (in line
spaces)
Maximum width of a whole rest (in line
spaces)
Too wide, or not wide enough rectangles are not
considered.
Minimum height of a whole rest (in
line spaces)
Maximum height of a whole
rest (in line spaces)
Too thick, or not thick enough rectangles are not
considered.
Maximum vertical distance from the rest to the
staff area (in line spaces)
Most of the time, the vertical height of rests is in
the staff area. However, particularly when the staff
is made of several voices, the rest is shifted up or
down in order to avoid ovelapping with other symb
This value sets the maximum offset from the rest to
the upper or lower bound of the staff.
Tuplets
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Complexity: low
Tuplets can apply to notes and rests. They are
generally drawn above or below a beam. They can be
drawn using a bracket that specifies the notes to
apply the tuplet to.
Tuplets can be confused with fingering notation.
Tuplet seeking can be deactivated through the
"Correction" menu, for the whole document.
Maximum horizontal distance between the number
and the middle of the beam (in line spaces)
When the tuplet is related to a group of beamed
notes, the tuplet number is centered on the beam.
This value defines the maximum offset from this
ideal value. (a)
Maximum vertical distance between a tuplet and
the line (in line spaces)
The tuplet number is usally close to the beam.
This value defines the the maximum offset from this
ideal value. (b)
For thin lines broken by a tuplet value, Maximum
horizontal distance between the line end and the
note (in line spaces)
Sometimes, the tuplet is drawn with a bracket
that encloses notes. This value defines the maximum
gap between the number and the line end (c)
Maximum horizontal distance for connecting
broken tuplet lines (in line spaces)
When the tuplet number is drawn over the line, this
line is broken. This value defines the maximum width
of the gap (d)
Minimum height for tuplet text (in line
spaces)
Maximum height for tuplet text (in line
spaces)
These bounds of tuplet character height help to
differentiate between a tuplet and a fingering.
For discriminating between a tuplet and a
fingering ornament, ratio between the number
of text objects that can make a well placed
tuplet and the number of text objects that can
make a tuplet
The possible confusion level between tuplet and
fingering is calculated, and if too high (big
proportion of possible misplaced tuplets), we'll
suppose that tuplets are all drawn with a bracket.
Dots
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Complexity: low
Dots can be drawn after the notehead to alter its
duration, or they can be staccato or repeat barline
elements.
Minimal size of a dot (in line space)
Dust (small meaningless dots) can be removed with
this setting.
Maximum size of a dot, to discriminate it from
a grace note head (in line spaces)
Enables to discriminate between a dot and a grace
note head.
Increasing this value can affect the double-whole
rest recognition
Maximum vertical distance between the notehead
and the dot (in line spaces)
The duration dot related to a notehead to make a
dotted note value can be shifted vertically. If a
duration dot is not taken into account, increase
this value slightly.
Maximum horizontal distance between the
notehead and the dot (in line spaces)
Defines the maximum horizontal distance for a
dot to be considered as being related to a notehead.
Maximum distance between the dot and the repeat
bar (in line spaces)
If a repeat barline is taken for a piece start
or end barline, increase this value.
Ornaments
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Complexity: average
PDFtoMusic has some settings to manually compensate
for graphical similarities, such as the shape of
tenuto ornaments and whole rests.
Minimum horizontal size for a tenuto (in line
spaces) (b)
Maximum horizontal size for a tenuto (in line
spaces)
Minimum vertical size for a tenuto (in line
spaces) (a)
A tenuto is a small horizontal line usually drawn
above the notehead. Many kinds of horizontal lines
can appear on a score. These values can be adjusted
to locate tenuti between the horizontal lines that
haven't yet been processed as staff lines or ledger
lines.
Maximum horizontal distance between ornament
and note (in line spaces) (c)
Maximum vertical distance between ornament and
note (in line spaces) (d)
Ornaments are generally placed near the note they
are related to. These values define the maximum
tolerated distance.
Minimum horizontal size of an ornament (in line
spaces)
Some very small shapes can be taken for ornaments.
This value removes very small shapes that can be
taken for ornaments.
Fingering
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Complexity: average
Fingerings are numerical values from 0 to 5 that
define the finger of the performer that has to be
used to play the note.
They can be easily confused with tuplets.
To know the height of a character on the page, hold
the mouse pointer over the object for one second.
Fingering character minimum height (in line
spaces)
Fingering character maximum height (in line
spaces)
Adjusting fingering character height bounding values
can, in some cases, help to differenciate between a
tuplet and a fingering.
Slur
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Complexity: low
Slurs and ties are always related to two notes: the
source note and the target note.
For each shape likely to be a slur, PDFtoMusic Pro
searches for the matching notes. If the slur is
split because its staff reaches the right edge of
the page, PDFtoMusic will seek the target note in
the matching staff of the next system.
Maximum horizontal distance between the slur
end and the notehead (in line spaces)
Maximum vertical distance between the slur end
and the notehead (in line spaces)
Maximum distance between the notehead and the slur
end. It only affects the rough search of notes
related to the slur.
Minimum slur height (in line spaces)
Defines the amount of arc a slur must have in order
not to be considered a horizontal line.
Imprecision for slur seeking (in line spaces)
Fine setting for finding the note to be related to
the slur.
Vertical imprecision for connecting slurs from
a system to another (in line spaces)
When a slur is broken by the end of the page, a
second slur is searched for in the equivalent staff
of the next system. This value defines the vertical
tolerance for finding the second slur.
Imprecision for merging two overlapping slurs
(in line spaces)
In some files, several slurs are drawn at the same
place. In order to reduce them to only one slur, an
area comparison is performed, with this tolerance.
Ratio of two-part slurs (mirror) occurrence
In some files, slurs are drawn in two parts, one for
the first half, then one (mirorred) for the second
part. An analysis is performed for determining
whether the file follows this way of displaying
slurs.
If the number of end to end slurs compared to the
number of separated
slurs
is
greater
than
the
ratio,
slurs
are considered to be
mirrored.
In some cases the slurs are traced via a multitude
of small lines.
The following parameters allow you to adjust the
splicing precision of these lines.
-Horizontal search precision for castings drawn
with lines (in line spaces)
-Precision of vertical search for flows drawn
with lines (in line spaces)
Tie
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Complexity: low
Slurs have been extracted, PDFtoMusic Pro now tries
to find which of them are actually ties.
This needs the note height to be compared, as well
as a rather short distance between the notehead and
the tie end:
Maximal horizontal distance between the tie end
and the note head (in line spaces)
Maximal vertical distance between the tie end
and the note head (in line spaces)
Beam
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Complexity: average
Horizontal and slanted lines that have not been
processed yet will be analyzed in order to see
whether they connect to note stems and are thick
enough. They will consitute the beams..
Horizontal imprecision between stem position
and beam (in line spaces)
Adjusts how far from the note stem the beam is
allowed to appear before it is no longer considered
a beam grouping. This value enables to adjust this
tolerance (a).
Note that PDFtoMusic may interpret tenuto ornaments
as beams if this value is increased.
Horizontal imprecision between stem position
and beam for tremolo (in line spaces)
For tremolos, the beam doesn't connect to the stem
(b)
Vertical imprecision between stem position and
beam (in line spaces)
In the same way, vertically the stem end has to be
close to the beam (c)
Minimum thickness of the beam (in line
spaces)
Horizontal and slanted lines will be considered as
beams only if their thickness is above this value
(d)
Be aware a too low value can disturb the tuplet
recognition.
Maximal thickness of the beam (in line spaces)
Horizontal and slanted lines will be considered as
beams only if their thickness is below this value
(d)
Minimal distance between beam and notehead (in
line spaces)
Beams have to be far enough from the notehead (e)
Tolerance for multiple beam slope comparison
When a beam is made of several lines, they have to
be more or less parallel. This value is the
tolerance between these beam slopes.
Fonts
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Complexity: low
Ratio between characters on the staves and the
total number of characters for considering a font
as a music font
In order to know whether a font is used for drawing
music symbols or text, the way the font characters
are spread on the page is analyzed.
The number of characters drawn inside the staff
areas is counted, as well as the number of
characters outside these areas.
This ratio is compared to the value of this
parameter, and the font type determined.
Please note that this result can be changed after
the fact by manually editing the font type ("Correction" menu)
Characters
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Complexity: low
Characters that have not been yet processed as music
symbols will be analyzed in order to form words.
Maximum vertical distance between a character
and the word it belongs to (in percent of the word
height)
Defines the imprecision in the word base line. The
greater value, the more characters located on
slightly different line will be considered as
belonging to the same word.
Especially useful for for superscripted letters, as
in chord suffixes like "C7", where the "7" is
shifted up.
Maximum horizontal distance between the end of
a word and a character for concatenation (as a
ratio of the word height)
With a greater value, characters farther apart
horizontally will be considered as belonging to the
same word.
If this value is too high, lyrics related to the
staff might merge into a single word.
More important: on tablatures, cell numbers can be
erroneous. For instance, a 3 followed by another 3
on the same string will give "33"
Maximum horizontal distance between the end of
the word and the musical symbol for tempo
markings (in percent of the word height)
Enables to merge the tempo text indication and the
musical one, made of a note followed by an "equal"
symbol and the tempo value.
Minimal distance between two identical
characters (in percent of the character height)
In some files, each character is drawn several
time, -almost- at the same place. This parameter
enables to remove these identical characters when
another one has already been drawn.
Words
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Complexity: low
Characters have been grouped into words. These words
will constitute word lines, and these lines analyzed
to determine whether they are lyrics, or chord
names.
Bar numbers, staff or staff group names are
extracted.
Vertical imprecision for creating word lines (as
a ratio of the word height)
Defines vertical tolerance for creating word
lines.
Maximum horizontal distance between measure
start and its number (in line spaces)
Maximum vertical distance between measure start
and its number (in line spaces)
This defines maximum distances for measure
number seeking.
Maximum vertical distance between the staff and
its name (in line spaces)
Staff name is supposed to be vertically centered
on the staff line area. This parameter defines the
tolerance.
Lyrics
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Complexity: low
Word lines that are not chord name lines will be
analyzed to extract lyric lines. A lyric line is
always located under its matching staff.
Ratio for discrimination between dash and
underline
Horizontal lines in a lyric line are considered as
dashes or underline (melisma). The vertical position
of the line, in proportion of the line height,
differenciates between them.
Ratio between the number of words and
the number of notes in a staff line, theoretically
1.
Enables not considering some words as lyrics, if
greater than the limit.
Sometimes, text lines, drawn under a staff are
not lyric lines, but for instance, the page footer.
The words that can be related to a note are counted,
in proportion with those which can't. If this ratio
is below the provided value, the line won't be
considered as a lyric line.
Maximum distance between the first line of
lyrics and the bottom of the staff (in line
spaces)
If the first word line is too far from the bottom of
the staff, it is not considered as a lyric line.
Maximum vertical distance between lyrics
lines (in multiple of the line height)
When searching music with several lyric verses, this
setting determines the maximum distance to consider
between verses.
Matching ratio between notes for shared
lyrics
When a lyric line is located between two parts,
notes in the two staves are compared, and a matching
ratio between them is computed. If the result is
greater than this parameter value, lyrics are
considered as shared between the two staves.
Paragraphs
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Complexity: low
Words that have not been yet processed as lyrics,
chord names, staff names, etc, will be grouped into
paragraphs and exported as free text.
First, words will be aggregated into word lines,
then the lines vertically merged into paragraphs.
Maximum horizontal distance for merging text in
lines (as a multiple of the font size)
Maximum distance between two words on the same
line.
Maximum horizontal distance for adding a space
in line (as a multiple of the font size)
If the distance between two words on a same line
is greater than this value, a space character will
be inserted between them.
Maximum horizontal distance for merging lines
in a paragraph (as a multiple of the font size)
Maximum horizontal offset between two lines in a
same paragraph. It is applied to the left and the
right of the lines (paragraphs can be justified)
Maximum vertical distance for merging lines in
a paragraph (as a multiple of the font size)
Maximum vertical distance between two lines of a
same paragraph.
Multiple
bars
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Complexity: low
Multi-rest measures are drawn as a symbol at the
center of the measure, and a number above.
Minimum height of the multi-rest number (in line
spaces)
The number has to be tall enough (a)
Maximum offset between the multi-rest number
and the measure center (in line spaces)
The number has to be more or less centered in the
measure (b)
Maximum distance between the multi-rest number
and the staff (in line spaces)
The number has to be drawn above the staff, but not
too far (c)
Parts
/ Endings
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Complexity: low
Part indicators define portions of the score that
are played only at some times.
Maximum thickness of a part line (in line
spaces)
Vertical or horizontal lines thinner than this value
will be ignored (a)
Minimum height of the vertical line (in line
spaces)
Vertical lines at the beginning and the end have to
be tall enough (b)
Minimum length of the horizontal line (in line
spaces)
The line that joins the beginning and the end can be
broken, we define here its minimum length (c)
Imprecision for connecting vertical and
horizontal lines (in line spaces)
Vertical and horizontal lines are interpreted as
part of the same (ending) bracket only if they are
within this tolerance.
Minimum height of numbers (in line spaces)
Numbers have to be big enough (d)
Minimum height of dot (in line spaces)
The dot between numbers, if present, must be big
enough. If it is not, it will be removed, in order
to avoid confusion with a staccato, for instance.
Crescendo
/
decrescendo
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| |
Complexity: low
Slanted lines that have not been considered yet as
beams are analyzed in order to determine whether
they connect by one of their ends. Depending on the
result, they are either considered as crescendo,
decrescendo or marcato.
Horizontal imprecision for seeking the two
lines of the symbol (in line spaces)
Vertical imprecision for seeking the two lines
of the symbol (in line spaces)
Lines have to connect with enough accuracy (a &
b)
Minimum size for a decrescendo. If smaller, the
decrescendo will be changed into a marcato (in
line spaces)
Decrescendo has to be wide enough, otherwise it is
considered as a marcato (c)
Comparison of crescendo line size (as a ratio
of the reference size)
Lines must be of about the same length (d)
Dynamics
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Complexity: low
Maximal distance between dynamic and middle of
the staff (in line spaces)
If distance is greater than this value, dynamic
marks (pp, mf, ff...) are not considered as such.
Octave
offset
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Complexity: low
Octave shift symbols (8va, 8vb, 15ma, 15mb) are
followed by a line, dashed or not, that shows which
notes are affected.
Horizontal imprecision for seeking line on the
right of the symbol (in line spaces)
The line must not start too far from the symbol (a)
Vertical imprecision for seeking line on the
right of the symbol (in line spaces)
Line has to be more or less vertically centered on
the symbol (b)
Discrimination between a line drawn with dashes
and a line with dashed attributes (in line spaces)
Maximum distance between dashes when the line is
drawn dashed (c)
Pictures
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Complexity: low
In a PDF file, pictures can either be decorative or
draw the shape of a music symbol.
Maximum size of pictures to be processed as
music symbols (in pixels)
Bigger pictures will be considered as decorative.
Minimal size of pictures to be processed as
music symbols (in line spaces)
Smaller pictures will be considered as decorative.
Minimum size of pictures to be exported in the
result (in pixels)
Smaller pictures will be ignored and won't be
exported in the result file.
Chord grids
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Complexity: low
A grid of horizontal and vertical lines is sought. A
chord name is associated with this grid.
Minimum and maximum distance between two lines
(in line spaces)
minimum and maximum distances between grid lines.
Inaccuracy of start of line (in line spaces)
tolerance for the search for the beginning of lines
Maximum distance between diagram and staff (in
line spaces)
diagrams that are too far apart will be eliminated.
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