Does uncompressed video have an associated colorspace?

the Black Monarch · Post by **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.

trythil · Post by **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.

the Black Monarch · Post by **the Black Monarch** » Sat May 31, 2003 5:25 pm

So... what colorspace does it use?

Zarxrax · Post by **Zarxrax** » Sat May 31, 2003 5:46 pm

Uncompressed video uses either RGB or RGB32 colorspace.

trythil · Post by **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.

NicholasDWolfwood · Post by **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

Zarxrax · Post by **Zarxrax** » Sat May 31, 2003 6:08 pm

Well, technically yuy2 and yv12 could be considered forms of compression :\

klinky · Post by **klinky** » Sat May 31, 2003 6:31 pm

I believe they're just different ways to acheive the same goal. :O

the Black Monarch · Post by **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.

Fucked in the ass for the third time today. Wonderful.

NicholasDWolfwood · Post by **NicholasDWolfwood** » Sat May 31, 2003 6:47 pm

You will not avoid color space conversions.

DVD (YV12) -> Premiere (RGB) -> HuffYUV / XviD (YUY2)