Dad's Army in Colour_ Room at the Bottom - Comedy-web1.mov

[Kaveh1000]

Thaks for comment Lyris1. I am slowly getting my head around this. :-)

[masterstarfox]

i wached that on dad's army night.

[joflynn999]

I hope this means several early 1970s episodes of Steptoe and Son will get the same treatment!!!!

[qwertdr]

Most are home tape recordings made by the creators - thus making chroma dots impossible for the majority.

[Tripp1993]

Or even "The Year of the Sex Olympics"!

[Kaveh1000]

Indeed would be interesting. But I think this was unusual, in that they were making a monochrome copy for overseas. Also, he says the monitor was black and white but I am sure it would have to be a colour monitor to have the chroma dots.

By the way I am interested how you found this page in the first place! This was uploaded today I think.

[marinedalek]

Quite the reverse - a colour monitor would have filtered out the dots. The dots are actually a high-frequency signal laid over the picture information, a wobble from white to black. A colour TV decodes this signal, filters it out of the black and white image and uses the information to lay colour over the top. A black and white monitor doesn't "know" about the signal, so it doesn't get filtered out.

[emrabt]

is this why, sometimes when watching a black and white bbc show, you can see tiny bits of red / green?

Am i the only person to notice this?

[NotATube]

Apparently the person who designed the colour-recovery technique got the same idea from observing exactly the same phenomenon as you did.

[lyris1]

@emrabt It depends how you're watching the shows. It could just be standard Composite video artefacts.

[lyris1]

@Kaveh1000 it wouldn't have to be a colour monitor to have the chroma dots. They weren't filtered out of the signal, so they'd appear on the black and white video monitor. You can occasionally see what I think is the same effect on consumer TVs when they're switching between video standards.

[frankftw]

@Kaveh1000 The dot or stripe pattern on a color CRT would obscure the chroma dot pattern. This process uses part of the signal that shows up as a picture defect when a color broadcast is viewed on a black and white TV

[KnawSays]

What an inventive technique this is.

It would be great if they would look at other old tapes to see if any chroma dots still exist.