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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

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Old 18th Nov 2017, 8:31 pm   #41
G6Tanuki
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Default Re: Colour Wheels etc.

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Originally Posted by n_r_muir View Post
Decades ago I remember seeing one of the cameras of the type that was used on these missions, I don't remember much of the detail except that the camera was quite small and that the shape of the filter segments on the colour wheel were not the regular shape that one might expect, the edges of the individual segments were much more of a sweeping curve rather than a straight line between the individual colour filter sections. I was told the reason for this distinctive shape, but unfortunately the explanation has faded into the mists of time passed.
The curve was to deal with the progressive time-delay of the scan's traverse: if you don't do this then you get an effect similar to the way aircraft propellers appear curved when videoed.

See http://www.popularmechanics.com/flig...ed-in-one-gif/

[The color-wheel would need to have a curvature-between-segments of an equal-and-opposite 'sign' to the non-linearity of the scan-function in order to negate this effect]
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Old 18th Nov 2017, 8:48 pm   #42
peter_scott
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Default Re: Colour Wheels etc.

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Originally Posted by Panrock View Post
I've just made this frame sequential RGB animated .gif. I can see it best in JASC 'Animation Shop' which I used to make it. It may run slow with little colour mixing if you just click on it here. Others may be able to suggest suitable software to view it, repeating endlessly, at a good speed. Or maybe re-save it into some movie format at your end...
Good try Steve but it doesn't run fast enough on my machine.
(A bit like my attempt to represent Baird flicker.)
https://www.youtube.com/watch?v=xZ2EXYezE1c

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