You could use DVCProHD on the HPX250, that is 4:2:2, 8 bit, 100 Mbps. Of course the horizontal resolution is reduced and the compression is not wavelet-based.
HPX250: What Are P.A.P. Filters?
- Thread starter David Saraceno
- Start date
Mike Warren
Well-known member
If each step represents the same analog voltage difference I'd be inclined to agree with you, but it may be (I hope) that what it represents is finer graduations.
KINOKS
Well-known member
If resolution isn't such a problem, then maaaybe. But AVCi is a better codec so it probably looks better in any case.
Sorry but that's to techy for me
Care to elaborate?
Mike Warren
Well-known member
Sorry but that's to techy for me
Noise is more apparent in the shadows. If adding extra bits just increased the voltage range covered then it wouldn't affect noise, but because a video signal is a specific voltage, what the extra bits do is produce finer graduations in the voltages. Because the final output is nearly always 8 bit, that means much more adjustment is possible during post before banding and posterization will appear.
Noise is an analog voltage between zero and some maximum. if the noise voltage at a particular pixel is more than half a bit in strength, that bit is set, so with finer graduations, some of the noise will translate to a lower level.
This all assumes the signal is being captured at the sensor at 10 bits or more.
KINOKS
Well-known member
So with finer graduations you're referring to 10bit right (in contrast to 8bit)? And to a lower level you mean to a lower voltage?
Ok thanks, good to know. I have learned to switch PAP and make regular use of it for daylight and dark shots. The noise issue I had with 1/64 ND and iris @8 was due to the fact that PAP1 was on. With PAP2 I would have never been necessary to close down that far. I always prefer to slightly underexpose if possible, havent had time to see if blown whites can be corrected in post even if they are 10 bit
(I doubt it).
KINOKS
Well-known member
havent had time to see if blown whites can be corrected in post even if they are 10 bit
Clipped means clipped!
nothing you can doI always prefer to slightly underexpose if possible, havent had time to see if blown whites can be corrected in post even if they are 10 bit
Typically I find it saves stuff above the clipping point, so if you're working in a program that works in 32bit floating point space, you can recover a certain amount of the clipped highlights. I've also found that thanks to the fidelity of the 10bit codec, you can bump your pedestal way up to like +20 so you can underexpose and get more highlight range.