think black bars on left and right

[David Roth weiss]

Canon is obviously making imperfect pixels, so either quit shooting Gatorade bottles or feed your dog approximately 1/3 of a cup more kibble each day for one week and the black bars will go away.

David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los Angeles

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[Paul Dickin]

Hi
Here’s an explanation of the digital video 702/720 pixel width situation.
It’s a PAL document, but the principle is the same for NTSC – if the appropriate NTSC pixel aspect-ratio and line number is used in the maths.
https://www.bbc.co.uk/commissioning/tvbranding/picturesize.shtml

[Tom Wolsky]

Thanks for that Paul.

But going way OT: I ask about Photoshop because in correspondence I’ve noticed that a number of Europeans and in the BBC document you linked use PhotoShop, with a capital S. Is this the way the box and software appears in European editions? Here in the US it’s always Photoshop, with a lower case s.

All the best,

Tom

Class on Demand DVDs “Complete Training for FCP6,” “Basic Training for FCS2” and “Final Cut Express Made Easy”
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[Walter Biscardi]

[Tom Wolsky] “I’ve noticed that a number of Europeans and in the BBC document you linked use PhotoShop, with a capital S. Is this the way the box and software appears in European editions?”

Not according to Adobe’s website and looking at the store for the United Kingdom. The name on the box is actually capitalized all the way and the description does not capitalize the S.

https://store2.adobe.com/cfusion/store/flex/index.cfm?store=OLS-UK&storeclient=flex&nr=0

Walter Biscardi, Jr.
Biscardi Creative Media
HD and SD Production for Broadcast and Independent Productions.

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[Rafael Amador]

Hi Paul,
The BBC document is very interesting, but I think that don’t explain at all the black side-bars on capture from a MiniDV camera.I’ve never sow that before.
I think Andy should check if by any chance have some kind of distortionapplied in the clips,or something estrange in the capture preset.
Rafael

http://www.nagavideo.com

[Andy Devries]

“Digital pictures are effectively wider than analogue pictures by 18 pixels but the 4:3 image sits inside the 720 by 576 area. The additional 18 pixels are required for digital processing and it would be perfectly acceptable to leave them black – but if the image is shrunk via a digital DVE, two 9 pixel wide black stripes will be seen at the sides.”

That seems to be the ticket…but I’m still not sure what the solution is aside from stretching the image horizontally (which works well enough for the projects I’m doing).

I’m importing with NTSC Firewire Basic by the way.

[John Foley]

I’m importing with NTSC Firewire Basic by the way.

I thought you were in PAL land??? Is that not true?

“Digital pictures are effectively wider than analogue pictures by 18 pixels but the 4:3 image sits inside the 720 by 576 area. The additional 18 pixels are required for digital processing and it would be perfectly acceptable to leave them black

That language is not NTSCish. NTSC DV is 720×480 pixels. In an NTSC codec, there are no black bars.

[Paul Dickin]

Hi
My older Sony VX9000E puts the 9 pixel black bars at the edges, but more recent Sony camcorders don’t seem to.

(Its still Photoshop in the UK – that’s a typo in the linked document).

[Nate Stephens]

Andy, I see these side bars with Captured Betacam, also. I was told by an Engineer, as he was pointing at the video scope, that the bars are referred to as the front and back porch to the video signal. It is where on the old CRT that the scan would travel from the bottom of the picture back up to the top of the picture to travel down again, or other words called “the video blanking” It is how you would time various analog video decks and machines (DVE, character generators, TBC ) to have all there signals match so the signal would not break up or roll as it goes thru a video switcher. It is the part of the signal that, I have been told is the ‘critical’ part -front and back porch- for the picky network types like PBS and National Geographic… A true video engineer could explain it better… Everything being digital these days, I think it is more a left over from old analog video….. but find an engineer..

FCP, Mac Pro, Mac Book Pro, HPX500, HVX200, Betacam, Dvcam
Write for the Edit, Shoot for the Edit, Edit…..KISS Principle

[Rafael Amador]

Yes thats all is correct when talking about digitizing analog signal. For example when you pass Betacam through any DVE (If the full horizontal signal is digitized, the Horizontal Blank have to shows up a black).
But we are just downloading a video stream that by definition is 720×576.
We are giving PAL numbers, but this is also applicable to NTSC.
Rafael

http://www.nagavideo.com