Center, Aspect Ratio and Blanking of Video Images

Metadata

Publisher: SMPTE
Doc Type: Recommended Practice (RP)
Abstract: Most video standards documents specify tolerances for individual picture blanking edges; center and aspect ratio are only implied by nominal blanking values, and vary as the blanking edges move within permitted tolerances. Modern techniques of post-production require compositing of images generated by multiple devices (and sometimes originated in different video standards). These techniques demand a degree of precision not afforded by the implied definitions of center and aspect ratio. — This practice defines picture center and aspect ratio for a number of existing video standards, and provides an extensible technique that may be used to define center and aspect ratio for future standards. Test charts and test patterns are described which permit image generation and display devices to be calibrated to the recommended geometry. Recommendations are made for blanking widths at various stages of the production/post-production process. Additionally, a definition is provided for a set of recommended screen units permitting simple cross reference between standards with aspect ratios of 4 × 3 and 16 × 9. — The practice is intended to be used for calibration of image generation and display devices. It is also intended as a reference for designers of such equipment (particularly graphics devices), and for designers of processing equipment such as image-manipulation devices.
Release Tag: 19951206-pub
Publication Date: 1995-12-06
DOI: 10.5594/SMPTE.RP187.1995
ISBN: 978-1-61482-201-1
Link: https://doi.org/10.5594/SMPTE.RP187.1995
Group: SMPTE 10E Essence
Keyword(s): Communication, Networking and Broadcast Technologies, Image Formats, Television, Image Format

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▶ SMPTE RP 187:1995 (1995-12-06)

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Bibliographic Reference(s)

R-REC-BT.470-4 NOT IN REGISTRY
ITU-R BT.601.7 [Active]
SMPTE ST 125:1995 [Superseded]
SMPTE ST 170 [Active, Stabilized]
SMPTE ST 240 [Active, Stabilized]
SMPTE ST 244 [Active]
SMPTE ST 260 [Active, Stabilized]
SMPTE ST 267:1995 [Withdrawn]

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doi: 10.5594/SMPTE.RP187.1995
url: https://doi.org/10.5594/SMPTE.RP187.1995

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SMPTE RP 187, Center, Aspect Ratio and Blanking of Video Images
doi: 10.5594/SMPTE.RP187
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SMPTE ST 2016-2:2014 [Active]
SMPTE ST 293:2003 [Active, Stabilized]
SMPTE ST 377(m):2004 [Superseded*]
SMPTE ST 96:2004 [Active]