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| Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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22nd Mar 2017, 10:08 pm
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#1 |
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Hexode
Join Date: Jan 2012
Location: Weymouth, Dorset, UK.
Posts: 422
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Black outlines?
Hi guys can anyone tell me what causes the black outline around very white things in old 405 line recordings? I think I've also seen it on black and white 525 line US recordings
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22nd Mar 2017, 10:21 pm
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#2 |
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Dekatron
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,433
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Re: Black outlines?
Is it the halo from the image orthicon cameras? It was there on UK shows as well.
Edit. It shows on this video, about 2 mins in on the piano, enjoy the clip classic jazz musicians. https://youtu.be/02VlSqd401I Last edited by Nuvistor; 22nd Mar 2017 at 10:24 pm. Reason: Video clip link |
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23rd Mar 2017, 7:49 pm
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#3 |
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Hexode
Join Date: Jan 2012
Location: Weymouth, Dorset, UK.
Posts: 422
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Re: Black outlines?
Yes that's the effect, I mean it was more evident with 405 line recordings. I did enjoy that though.
Thanks. |
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24th Mar 2017, 2:55 pm
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#4 |
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Octode
Join Date: Mar 2006
Location: Co. Durham, UK.
Posts: 1,117
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Re: Black outlines?
I had always associated it with the combination of 'dazzle' and positive video modulation.
Obviously not, as the clip shows. Possibly just straightforward 'dazzle', then? |
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24th Mar 2017, 7:02 pm
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#5 |
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Heptode
Join Date: Jul 2006
Location: Winchester, Hampshire, UK.
Posts: 639
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Re: Black outlines?
If you wiki "image orthicon" and then look up 'dark halo' under the entry, you'll find an explanation for the effect.
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24th Mar 2017, 7:18 pm
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#6 |
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Hexode
Join Date: Mar 2009
Location: Worthing, Sussex, UK.
Posts: 277
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Re: Black outlines?
Puddled highlights.
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24th Mar 2017, 11:42 pm
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#7 |
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Octode
Join Date: Jan 2013
Location: Barnsley, South Yorkshire, UK.
Posts: 1,517
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Re: Black outlines?
Yes, it's the effect of highlights on cameras using image orthicon tubes. it was seen to best effect on the early space rocket launches where the white-hot rocket exhaust was surrounded by an huge black halo. White shirt collars were pretty good at showing the effect, although it could sometimes be partially hidden by a black suit jacket.
The effect generally looked much worse on US material because 3 inch tubes were the standard in the US whereas the UK usage was (the BBC inspired development) 4.5 inch tubes which, proportionally exhibited the effect less. |
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27th Mar 2017, 12:54 am
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#8 |
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Hexode
Join Date: Jan 2012
Location: Weymouth, Dorset, UK.
Posts: 422
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Re: Black outlines?
Thanks guys I'll look it up on Wiki. I think the worst example was in the film of an orchestra playing and they had silver candle holders with lit candles. The reflections of the studio lights produced black effects and of course the candle flames did too. It was a comedy orchestra the name of which now escapes me
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