ARC130S SECTION
6
ARC130S 060801 Version 1 Issue 1
6.2
CC
Raster aspect ratio -
Number(s)
Aspect Ratio of the full raster when correctly displayed expressed as a two digit abbreviated numeric
value where the comparison ratio is against a height of 9. 12 is used for 4 by 3 ( 12 by 9 ) Note that
areas involved with code entry into database systems ask that only two digit codes are to be used.
Code 99 is used where ratio is very non-standard and is separately documented.
ie.
Two digit number(s) giving the
a
spect ratio of entire picture / raster / graphics bitmap, including all
the black of any Letterbox or Pillarbox area, that gives a correctly displayed image - . Numbers
describing ratios seen in use at present are: 12, 14, 15 ( Super16 ), 16, 17 ( 1.85:1), 21 (2.35:1
Cinemascope), 24.
e.g. A 16 : 9 full height “anamorphic” raster is shown as
16
.
A request for material suitable for 16 by 9 TX could just be “supply it in
F16
format”.
D
Protection for Conversion. -
Letter
This parameter is for material prepared with “Shoot Protection” for subsequent conversion into other
image formats that may safely crop the image. The letter code describes which format the material is
“Shoot Protected” for. This parameter’s primary use is for transmission with live conversion to indicate
on play-out which conversion ratios are required or possible. These letter codes can be applied to both
Letterbox and Pillarbox format conversions. Such letter codes are already in use by BBC Presentation.
A
16 : 9 protection .
( “Use
A
ll of 16:9 image”. Deep letterbox in 4:3. )
B
protection for conversion to 14 : 9.
C
protection for 4 : 3.
( 4 : 3
C
entre cut-out format when from 16:9 full frame.)
D
protection for 15 : 9
N
or
(blank)
.
No extra protection other than that for the current display format.
There may be additional uses for this parameter and further letter codes may be
specified.
Examples:
16F16B
16 : 9 image for 16 : 9 display Shoot Protected for conversion to 14 : 9.
A full frame 16:9 TX tape protected for cropping and conversion to a 14:9 format such as 14: 9
letterbox in 4 :3 raster - 14L12.
16F16C
16 : 9 image for 16 : 9 display Shoot Protected for conversion to 12 : 9.
A full frame 16:9 TX tape Centre Cut-out protected for cropping and conversion to a 4:3 format
such as 12L12 the standard 4:3 PAL format - 12L12.
12F12N
(12:9) 4:3 standard aspect ratio full height pictures.
Standard PAL.
14L12N
12F12N
16F16B
16F16C
