150 Chapter 5 Working with Formats
Frame rate examples (half the field rate with interlace scanning)
• 48 for 48 Hz
• 60 for 60 Hz
• 75 for 75 Hz
Aperture (used only when the aperture is not A)
See “Aperture designators” on page 150.
Common computer display formats
• VSC1275 for Viewsonic 1280 by 1024 at 75 Hz
• DMT0685 for Discrete Monitor Timing with 680 by 480 at 85 Hz
Aperture designators
Format names may include one or two characters that describe the aperture of the display.
These are listed below.
Aspect ratio
• Q = 1.00:1 Quadrate - MIL, Radiology (square, 512x512, 1024x1024)
• G = 1.25:1 Graphics workstation (5x4, 1280x1024, 1600x1280)
• A = 1.33:1 Academy (4x3, 640x480, 800x600, 1024x768, 1280x960, 1600x1200)
• B = 1.44:1 Big (13x9, IMAX™)
• T = 1.50:1 Three halves (3x2, 1152x768 Apple Computer)
• V = 1.56:1 PALplus WWS case #2 (14x9, see ITU-R BT.1119)
• D = 1.60:1 VESA CVT proposed (16x10, 1728x1080, 1280x800)
• E = 1.67:1 European film (15x9 or 5x3, 1200x720, 1280x768, 1800x1080, a.k.a. “1.66”)
• H = 1.78:1 High-definition image (16x9, 1280x720,1920x1080)
• F = 1.85:1 US film (320x173, 1280x692, 1920x1038)
• U = 2.00:1 Univisum™ (2x1, 1280x640, 1920x960)
• C = 2.39:1 CinemaScope™ (160x67, 1280x536, 1920x804, a.k.a. “2.35”, was 2.35
before 1971)
Content fitting operators
• N = Natural (do nothing)
• L = Letterbox (linear scale to fit one axis, center w/black bars in other)
• Z = Zoom (blow- up to fill destination aperture with cropping, or LI )
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