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BaggyG
Joined: 31 Jan 2008
Posts: 6
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| Posted: Fri Feb 01, 2008 11:47 pm Post subject: YUV into YPbPr |
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I think I'm getting the hang of this... Slowly.
Although I'm still a bit confused with the whole YUV (component) and YPbPr (component). 
I have a sat box that can output YUV via the SCART. I have YPbPr (which I belive is the anologue cousin to YCbCr  ).
Do I need to convert anything, and if so, how?
It's so nice to have so many different standards... NOT!
EDIT: Oops. Brain freeze... composite changed to component
Last edited by BaggyG on Sat Feb 02, 2008 12:17 am; edited 1 time in total
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WanMan
Joined: 19 Mar 2006
Posts: 10270
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| Posted: Fri Feb 01, 2008 11:59 pm Post subject: Re: YUV into YPbPr |
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| BaggyG wrote: | I think I'm getting the hang of this... Slowly.
Although I'm still a bit confused with the whole YUV (composite) and YPbPr (composite).
I have a sat box that can output YUV via the SCART. I have YPbPr (which I belive is the anologue cousin to YCbCr ).
Do I need to convert anything, and if so, how?
It's so nice to have so many different standards... NOT! |
YPbPr isn't composite. Its component.
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Trust no one. Absolutely no one. Advice of the board.
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jkruger
Joined: 24 Oct 2007
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Location: Carlsbad, CA
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beun
Joined: 28 Jun 2006
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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Mon Feb 04, 2008 5:47 pm Post subject: |
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Actually, the FAQ does not address OP's question.
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Dave
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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Mon Feb 04, 2008 5:57 pm Post subject: Re: YUV into YPbPr |
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| BaggyG wrote: | I think I'm getting the hang of this... Slowly.
Although I'm still a bit confused with the whole YUV (component) and YPbPr (component).
I have a sat box that can output YUV via the SCART. I have YPbPr (which I belive is the anologue cousin to YCbCr ).
Do I need to convert anything, and if so, how?
It's so nice to have so many different standards... NOT!
EDIT: Oops. Brain freeze... composite changed to component |
Here is the article to explain it:
http://en.wikipedia.org/wiki/YUV
However, these terms have been used interchangeably in the consumer electronics space. For instance, even though YCbCr is digital, Toshiba labeled the component outputs of its early DVD players YCbCr instead of YPbPr. I believe other early components used YUV as a label. So, if you are looking at a consumer electronic device and it says it can output "YUV" but does not say it can output "YPbPr", then chances are, it is using the term "YUV" incorrectly and it is really YPbPr.
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Dave
A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station....
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Mon Feb 04, 2008 8:10 pm Post subject: |
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I could be wrong, but I think YUV can really only refer to analog NTSC/Pal/SECAM equipment. Even though YPrPb is based on YUV, it's not the same thing. I think Dave's right - if there even ever was a piece of mainstream consumer equipment labeled "YUV" (I doubt it), I think it was probably mis-labeled.
<nostalgia trip>
I used to use an Abekas frame store back in college that was YUV-based. I had to convert all my RGB output from ElectricImage, Alias|Wavefront, After Effects, etc. with Debabelizer on the Mac or an SGI command-line batch utility to .yuv files before I could FTP them to the Abekas for display/recording to 3/4" or S-VHS. Imagine 2-300 uncompressed 720x486 frames... Moving them around by hand (SyQuest 200) over 10T from SGI to the Abekas - all to get 5 or 10 seconds of animation on tape. It was beautiful, though for back then because it was totally uncompressed. Wow, that's going on 20 years ago. Yikes. That whole process would take a few SECONDS, now.
</nostalgia trip>
SC
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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Tue Feb 05, 2008 4:50 pm Post subject: |
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| ecrabb wrote: | | I could be wrong, but I think YUV can really only refer to analog NTSC/Pal/SECAM equipment. Even though YPrPb is based on YUV, it's not the same thing. |
In signals, that is true, but a digital image for instance, can be YUV encoded. What Kim said is true, the difference is the scaling. All of these (YUV, YPbPr, and YCbCr) are converted from RGB signals and are ultimately a way of expressing RGB. YUV is actually easier to understand (I know you know most of this SC, just putting it here for completeness):
YUV:
Y is the luminance or "brightness" (greyscale) component (or the picture in black and white).
U is the blue luminance value (i.e. how much blue should be in the picture) with a scaling factor applied.
V is the red luminance value (i.e. how much red should be in the picture) with a scaling factor applied.
The green value is easy to determine because given the blue and the red luminance values, only 1 green luminance value will result in a greyscale value equal to Y. So, you can get the green.
YPbPr/YCbCr:
Y is the luminance or "brightness" (greyscale) component (or the picture in black and white).
Pb is the difference between blue and Y (i.e. B - Y)
Pr is the difference between red and Y (i.e. R- Y)
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Dave
A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station....
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BaggyG
Joined: 31 Jan 2008
Posts: 6
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| Posted: Wed Feb 06, 2008 9:54 am Post subject: |
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Er... Okay...
That does actually help.
Interestlingly, I went out and bought the component cable for the sat box (Foxtel IQ for those in Australia who might be interested) and plugged it into the SCART output. While the cable said it was for YPbPr input on the TV (the packaging said so  ) I had to select the YUV setting on the sat box configuration.
That's kind of what prompted the question.
The interesting thing is that later in the year the pay tv company are going to upgrade to hi-def boxes that will only output HDMI (if you want to get hi-def). Hence the need for the HDFury.
Baggy
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