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August 1993


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Film and TV Studies Discussion List <[log in to unmask]>
"Keith Nightenhelser, DePauw University" <[log in to unmask]>
Thu, 5 Aug 1993 13:51:42 -0500
Film and TV Studies Discussion List <[log in to unmask]>
text/plain (43 lines)
I am forwarding the following on behalf of Joey S. Schwartz--his computer and
that of screen-l have had a tiff and aren't presently speaking to each other.
It's a reply to a message I sent him about his screen-l posting on resolution.
                 --Keith Nightenhelser  [log in to unmask]
From:   IN%"[log in to unmask]"  5-AUG-1993 03:20:39.03
Subj:   Fwd: Re: resolution
Organization: Inter/Access, Arts Telecommunications & Media Centre, Toronto,
 ON, Canada
Content-transfer-encoding: 7BIT
Here are more accurate numbers, but the way that video is compared to film is
not by screen size (because film is usually projected at non-standardized
lengths for one thing) but by resolving power per one  square inch, which is
the same for a T.V. image that is one inch or 100 inches.  Another
consideration in video is bandwith, for every 1 megahertz of bandwidth equals
80 scan lines (not to be confused  with lines of resolution).  So a tape
format like VHS, which has a bandwidth of 3.5mhz, has only approximately 240
scanning lines, which decreases the overall resolution of the NTSC signal.  SO
here are the "official" numbers from Thomas A. Ohanian's book DIGITAL
NONLINEAR EDITING: New Approaches to Editing Film and Video:
FORMAT                                      LINES OF RESOLUTION
VHS                                             200
SVHS                                            272
STANDARD 3/4"                                   240
Laserdisc                                       336
Hi8                                             320 (luminance portion of the
Betacam                                         288
Betacam SP                                      336
2" Quad                                         336
1" Type C                                       336
D1                                              336
D2                                              336
D3                                              255
35mm Film                           6x resolution of average "broadcast picture"
                                    [2016 for regular film, 5247 has over 4000
                                     lines of resolution according to Kodak]
(from Ohanian, 212)