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The term contrast ratio may be preferred for the luminance range in a scene. [14] DSC: Digital Still Camera. Prefix on image filenames produced by various digital cameras. DSLR: Digital single-lens reflex camera; also dSLR. [2] ED: Extra low dispersion glass. Used in composite lenses to reduce chromatic aberration.
A chord (from the Latin chorda, meaning "bowstring") of a circle is a straight line segment whose endpoints both lie on a circular arc. If a chord were to be extended infinitely on both directions into a line, the object is a secant line. The perpendicular line passing through the chord's midpoint is called sagitta (Latin for "arrow").
Common lines and line segments on a circle, including a secant. A straight line can intersect a circle at zero, one, or two points. A line with intersections at two points is called a secant line, at one point a tangent line and at no points an exterior line. A chord is the line segment that joins two distinct points of a circle. A chord is ...
Chord line may refer to: . a straight line connecting the leading and trailing edges of an airfoil; Chord (geometry), a line segment joining two points on a curve Chord (astronomy), a line crossing a foreground astronomical object during an occultation which gives an indication of the objects size and/or shape
The fourth degree in major may be substituted for a seventh chord to create a "bluesy" sound. In a progression going up a fourth, if the first chord is a minor seventh chord, it can also be substituted for a seventh chord; a relative second degree can also be added before it to create a ii–V–I turnaround. (A sole minor seventh or seventh ...
Sheets containing only the chord progressions to the song are often called chord charts or chord sheets, to distinguish them from lead sheets. These sheets could be used by the rhythm section instruments to guide their improvised accompaniment and by lead instruments for their improvised solo sections, but since they do not contain the melody, they can be used in performances only by players ...
A 2008 medley by the comedy group the Axis of Awesome, called "Four Chords", demonstrated the ubiquity of the progression in popular music, for comic effect; for instance, as the progression is played as an ostinato, sometimes it is used as a vi–IV–I–V (i. e. the "pessimistic" inversion). It does not accurately represent the chord ...
The major line cliché moves from the fifth of the chord to the sixth, then back to the fifth. [16] Assuming the starting chord is the tonic, the simplest form of the major line cliché forms a I–I+–vi–I+ progression. The minor line cliché moves down from the root to the major seventh, to the minor seventh, and can continue until the fifth.