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All posts by Martin Harrison

Below are all of Martin Harrison's postings, with the most recent are at the bottom of the page.

Sorry I'm late in finding this thread, going back to David's post regarding the film "The French Line", according to IMDB this film was released in a ratio of 1.66:1 or, in figures we might use for TV these days, 15:9.

Freeview SD despite being nominally Widescreen format is in fact a 4:3 (or 12:9) ratio picture stretched to 16:9 (rectangular pixels), the Freeview system was designed to accomplish automatic switching of ratios within your TV or set-top box in response to a flag in the digital transmission nominating the signal as either 4:3 or 16:9 as appropriate.
The HD specification, however, is a native 16:9 format (with square pixels) and only ever intended to be shown on a 16:9 screen, any source material not in 16:9 would need to have curtain bars (usually black) added before transmission.
The end result might be subtly different pictures being transmitted.

I've had a look using a BBC internal resource and compared the two transmissions made on 8/8/2013 (SD and HD) and I have to say both appeared to be transmitted in 4:3 ratio.

One possible explanation for the difference David saw might be how David's SD receiver was set to switch aspect ratios on that day such as to overscan a 4:3 picture, the HD receiver would simply show what was transmitted on the HD channel.

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