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Old March 3rd, 2006, 05:28 AM   #1
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2.35 1280 x 720

If you were to crop at native reso Hd100 footage, your frame would be 1280 x 545 yes? not 1280 x 544 not 1280 x 546? What's the standard?
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Old March 3rd, 2006, 08:09 AM   #2
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Are you asking what the actual ccd chip dimensions are?

The actual CCD chips in the HD100 are listed as native 1280x720.

Oh, you mean for the 2.35 aspect ratio! Sorry, don't know that one.

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Old March 3rd, 2006, 08:22 AM   #3
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the math works out to 1280 x 544.68085..... rounding would suggest 545 but 544 divides evenly into 16 (34 times), which is sometimes better/necesary for video compression schemes.

basically it comes down to preference as you are rounding either way and both are off by almost half pixel. I do my cropping in After Effects and let it decide for me...which yields 1280x545. Hope this sorta helps.
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Old March 3rd, 2006, 08:33 AM   #4
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Isn't it interesting how close to 540 that figure is. 540 seems to be a common area where 1080 HD chips sit inside. CF24/25/30, possible 24F/25F/30F, Panasonic starting point for the CCD's.

Does this mean that in theory a 2.35:1 cropped 720p could still have as much vertical detail as a 540 based or deinterlaced 1080i source? Actually it would still be higher than deinterlaced footage that was in motion because of the interlace filtering.

It is too bad we cannot get an anamorphic lens for the HD100 yet. Then we could have an anamorphic 1692x720 instead of 1280x540.

It is also interesting to note that everybody thinks Star Wars used HD at 1920x1080 but that was also cropped in the same way meaning we only ever saw prints (or DLP projected) at around 1920x817. That happens to be very close to the calculated interlaced resolution of a lot of cheap 1080i cameras.

Getting back to your question I do not know the exact number but I think 545 is very close. I do not think during a film transfer a pixel or two will make a big difference. It might be better to go with 544 however because then you can have an equal amount of pixels cropped off the top and bottom.
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