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Originally Posted by kotrtim
My opinion is SAR won't change after cropping as you crop off pixels, and SAR is the ratio of every pixel, so the value of SAR should not change whereas the DAR will change as DAR is the measurement of the whole frame, when you croped, the frame size definitely changes.
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For me this brings up the question of what is the true DAR of a DVD source. Ie. If you have what used to be a T.V. program, which as we know is 4:3 (right?), but it has black bars on the side and the resulting AR after cropping them off is not 4:3, what do you do then? Use the bar-less DAR when calculating the SAR, or use the DAR with bars included, or just use the 4:3 DAR that you know it must be as a T.V. source? Quite confusing. For that matter, how is 720x480 4:3??