# Pixel Aspect Ratio

1. If a 16:9 Widescreen has a Pixel Display Ratio of 1.2121:1 then what is the Pixel Display Ratio for a None 4:3 Widescreen?  Quote
2. 16:9 widescreen only has a pixel aspect ratio of 40:33 (1.2121...) if the frame size is 704x480. What's a "Pixel Display Ratio"? If you're asking what's the pixel aspect ratio for a 704x480 frame of 4:3 display aspect ratio video -- it's 10:11 (0.9090...).  Quote
3. If a 16:9 Widescreen has a Pixel Display Ratio of 1.2121:1 then what is the Pixel Display Ratio for a None 4:3 Widescreen?
In what resolution?  Quote
4. Any resolution, display aspect ratio and pixel aspect ratio are related in this general formula: PAR x SAR = DAR  Quote  Quote
6. Any resolution, display aspect ratio and pixel aspect ratio are related in this general formula: PAR x SAR = DAR
No not any resolution, A resolution has to be defined to set the PAR, let's say we have 1440x1080 the PAR (Pixel Aspect Ratio) will be 1:1 or square pixel, If I have 720x480 the PAR will be 8:9 non square, For the example that Jagabo gave above 704x480 the PAR is 10:11, Assuming a 4:3 DAR (Display Aspect Ratio) for all cases according to what the OP is asking for, So no not any resolution.  Quote

It's hard to know exactly what the OP is asking, there's no context to the question at all  Quote
8. Any resolution, display aspect ratio and pixel aspect ratio are related in this general formula: PAR x SAR = DAR
Those followed remarks bring into focus the need to no longer use the "SAR" shortcut crutch.

The true, universal formula, which works in ALL cases - including those requiring transformation to different sizes or ARs - is:
Code:
` DAR = Horiz rez / Vert rez * PAR`
, where DAR = display or frame AR, and PAR = pixel or sample AR.
This formula satisfies dellsam34's resolution variability requirements, and holds true for all the formulae discussed in Selur's threads.

The OP is expecting specific answers to a generality question with an unspoken agenda. Jagabo's answer was probably the best attempt to get to the heart of the spirit of the question, but knowing the OP's history, it might never be sufficient.

Scott  Quote
9. Any resolution, display aspect ratio and pixel aspect ratio are related in this general formula: PAR x SAR = DAR
No not any resolution, A resolution has to be defined to set the PAR, let's say we have 1440x1080 the PAR (Pixel Aspect Ratio) will be 1:1 or square pixel, If I have 720x480 the PAR will be 8:9 non square, For the example that Jagabo gave above 704x480 the PAR is 10:11, Assuming a 4:3 DAR (Display Aspect Ratio) for all cases according to what the OP is asking for, So no not any resolution.
The equation can't be wrong, it is the definition of the system. Just because some commercial systems limit frames to particular dimensions and display aspect ratios (and hence pixel aspect ratios) doesn't invalidate the equation. They all follow the equation. But in theory, any display aspect ratio can be produced from any frame dimensions given the correct pixel aspect ratio -- as defined by the equation.  Quote
10. The question is not wrong, it is just not specific. It's like studying the caracteristics of a fluid where we have a general formula defined by pressure P, temperature T and volume V PV=nRT, We know the fluid behaviour based on the general formula but unless we know exactly what fluid is (oil, water ...) there is going to be no specific numbers of P, T or V. I know it's a weird analogy but that's what I was trying to explain in my earlier post.  Quote

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