Does uncompressed video have an associated colorspace?

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Does uncompressed video have an associated colorspace?

Postby the Black Monarch » Sat May 31, 2003 1:06 pm

I would think that a colorspace is required for all forms of visual data and not just compression, but I'm not sure.
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Postby trythil » Sat May 31, 2003 1:39 pm

Yes. Colorspaces define a number of things, such as byte ordering in the file, as well as how that byte order is interpreted by the client program.

As an example, Quicktime includes several ways of describing uncompressed Y'CbCrA (or YUVA) data: see http://developer.apple.com/quicktime/ic ... ch019.html for details.
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Postby the Black Monarch » Sat May 31, 2003 5:25 pm

So... what colorspace does it use?
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Postby Zarxrax » Sat May 31, 2003 5:46 pm

Uncompressed video uses either RGB or RGB32 colorspace.
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Postby trythil » Sat May 31, 2003 5:46 pm

the Black Monarch wrote:So... what colorspace does it use?


I just answered that question. Uncompressed video has an associated colorspace, and it can be pretty much anything. Usually you'll find either uncompressed RGB or some incarnation of YUV.

If that wasn't clear enough, I don't know what is.
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Postby NicholasDWolfwood » Sat May 31, 2003 5:54 pm

Zarxrax wrote:Uncompressed video uses either RGB or RGB32 colorspace.


Umm, no.

RGB24
RGB32
YUY2 (You have to find a VfW and DShow filter, but yeah)
YV12 I believe same as YUY2

and a few others
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Postby Zarxrax » Sat May 31, 2003 6:08 pm

Well, technically yuy2 and yv12 could be considered forms of compression :\
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Postby klinky » Sat May 31, 2003 6:31 pm

I believe they're just different ways to acheive the same goal. :O
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Postby the Black Monarch » Sat May 31, 2003 6:41 pm

Trythil, your first post said it had a colorspace - you didn't specify which ones until your second post.

I'm asking because I was wondering if I could avoid colorspace conversions by exporting uncompressed instead of using Huffy.

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Postby NicholasDWolfwood » Sat May 31, 2003 6:47 pm

You will not avoid color space conversions.

DVD (YV12) -> Premiere (RGB) -> HuffYUV / XviD (YUY2)
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Postby the Black Monarch » Sat May 31, 2003 7:14 pm

I can avoid some of them, just not all of them.
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Postby klinky » Sat May 31, 2003 8:53 pm

You can have UNCOMPRESSED RGB & UNCOMPRESSED YUV. Uncompressed is not a video format. It's basically raw image data. Image data can be defined in different colorspaces. There for you can have uncompressed YUV, RGB, CMYK(if that was ever supported for video editing).

Normal UNCOMPRESSED video on a Windows machine is UNCOMPRESSED RGB data. If you look in VirtualDub, or really any other program that pops up the VfW compression dialog box it says specifically "Uncompressed RGB". It's a bunch of RGB bitmaps stacked into a AVI structure. Trythil could do the same with Quicktime on loonix. A bunch of YUV bitmaps stacked inside a Quicktime structure.

Oh and HuffYUV will compress RGB data in RGB format as well. It will maintain RGB colorspace. It won't compress as well as YUV but it will work. Just make sure you don't have RGB setup to "Convert to YUY2" in the codec configuration.


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Postby NicholasDWolfwood » Sat May 31, 2003 9:01 pm

the Black Monarch wrote:I can avoid some of them, just not all of them.


How?

DVDs are YV12. Then take it into Premiere and it's converted on the spot to RGB. Any codec for distro you use is in YUY2, therefore you cannot avoid colorspace conversions unless you use Linux-Cinelerra, and even then there's YV12 -> YUY2
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Postby the Black Monarch » Mon Jun 02, 2003 12:44 pm

Yeah, but It's better than going through YV12 (DVD) -> YUV (Huffy) -> RGB (Premiere) -> YUV (huffy) -> RGB (Vdub) -> YUV (distro) bullshit. That's what I mean by avoiding SOME conversions.
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Postby Zarxrax » Mon Jun 02, 2003 2:03 pm

But... huffy can do rgb too :roll:
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