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Television Standards Converters, Modulators etc Standards converters, modulators anything else for providing signals to vintage televisions. |
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19th May 2020, 9:17 am | #1 |
Hexode
Join Date: Dec 2011
Location: Wigan, Greater Manchester, UK.
Posts: 291
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Test Card F
I hope these questions have not been asked before. I hope someone can answer them.
!, Why was the green body of the clown boosted to fluorescent green? 2, What is the bump half way up the girls arm? 3, On the blackboard the "X" is in the centre of the photo yet the girl seems to have just drawn an "X" in the centre of the game. Was this removed? The position of the hand indicates it has been drawn! |
19th May 2020, 9:20 am | #2 |
Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,511
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Re: Test Card F
It would be useful if you included a picture of the Test Card to remind us what you are talking about!
Andy |
19th May 2020, 9:57 am | #3 |
Octode
Join Date: Mar 2006
Location: Co. Durham, UK.
Posts: 1,117
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Re: Test Card F
I suspect that the picture was staged.
I don't think Carole drew anything at all. I think it was set up in advance. |
19th May 2020, 9:59 am | #4 |
Dekatron
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,433
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Re: Test Card F
Lots of information on test card F.
https://www.radios-tv.co.uk/test-card-f/
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Frank |
19th May 2020, 10:44 am | #5 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Test Card F
That card saved dragging out a colour or cross hatch generator, the X etc in the middle was just the job for static convergence/blue lateral adjustments.
Vivid colours were chosen as an aid to adjusting for correct saturation. Like many, must have spent countless hours staring at that test card Lawrence. |
19th May 2020, 11:43 am | #6 |
Dekatron
Join Date: Jul 2008
Location: Kington, Herefordshire, UK.
Posts: 3,674
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Re: Test Card F
Given that X marks the centre of the screen, you don't want a hand obscuring it.
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19th May 2020, 12:16 pm | #7 |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,129
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Re: Test Card F
... or at least a point near the centre.
In a revised version, named "Test Card J" (and its widescreen equivalent, "Test Card W"), the picture of Carole Hersee was rescanned with the cross centred. See the bottom of this page.
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Mending is better than Ending (cf Brave New World by Aldous Huxley) |
19th May 2020, 12:41 pm | #8 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,924
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Re: Test Card F
I always preferred test card F to the electronic, though more technically accurate, cards. I also found that you could get easily misled with a crosshatch generator, and TCF used to make you concentrate on the centre of the screen which is where most people focus. It would take seconds to set up the static convergence and focus, even if the X wasn't quite at the centre (well, most TVs of the time wouldn't get it absolutely central anyway), and you could easily get the flesh tones accurate to the eye, if not to a vectorscope. Plus you got jaunty music!
The odd green of the clown is open to debate. I thought it was to assist in setting up CDA decoders and just stayed with us. Not sure why 'proper' green wasn't used. But as to Carole's 'bump', I have no idea. |
19th May 2020, 12:51 pm | #9 | |
Dekatron
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 7,087
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Re: Test Card F
Quote:
The photo, as has been pointed out, is positioned so that the 'X' is in the centre of the screen. |
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19th May 2020, 1:05 pm | #10 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Test Card F
The X is not at dead centre, it's to the right and below.
Lawrence. |
19th May 2020, 1:14 pm | #11 |
Nonode
Join Date: Mar 2010
Location: Dukinfield, Cheshire, UK.
Posts: 2,038
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Re: Test Card F
Blimey, is it National Pedantry Day? The cross is roughly central and is near enough to be used for static convergence, surely?
As for the bump in Carole's arm, what bump?
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Andy G1HBE. |
19th May 2020, 1:22 pm | #12 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Test Card F
If the X was at the centre of the screen the picture would be off centre.
The only "bump" I can see is something protruding from the top of the girls forearm. Lawrence. |
19th May 2020, 2:27 pm | #13 |
Nonode
Join Date: Mar 2010
Location: Dukinfield, Cheshire, UK.
Posts: 2,038
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Re: Test Card F
But we don't use the X to centre the picture, we use the edge arrows. I think we all know that the cross was not quite central, but it was fine for its intended use, which was static convergence.
Re the 'bump' - isn't it something behind her arm? It looks like a finger or thumb.
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Andy G1HBE. |
19th May 2020, 2:44 pm | #14 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Test Card F
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20th May 2020, 10:50 am | #15 |
Octode
Join Date: Mar 2006
Location: Co. Durham, UK.
Posts: 1,117
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Re: Test Card F
If X was at the centre of the screen, you would probably be an American!
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20th May 2020, 11:11 am | #16 |
Dekatron
Join Date: Jul 2008
Location: Kington, Herefordshire, UK.
Posts: 3,674
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Re: Test Card F
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20th May 2020, 11:30 am | #17 |
Hexode
Join Date: Dec 2011
Location: Wigan, Greater Manchester, UK.
Posts: 291
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Re: Test Card F
This one has the "bump" removed and an extra "X" and an extra clown button!
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20th May 2020, 11:34 am | #18 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Test Card F
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20th May 2020, 12:36 pm | #19 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Test Card F
The one I have a copy of is an early one that indicates the frequency of the frequency gratings and has the four line colour bars.
Lawrence. |