bit confused, did you mean DNxHD or DPX?
because i had my share of gamma shift problems with DNxHD (plus
block artifacts, as mentioned) ... and recording DPX is not an
option with alexa as far as i know.
so it seems to me that recording ProRes in Arri Log C is still
the best choice, and avoids the gamma shift issues since you can
just read them in linear and use a separate colorspace
conversion. (well, with the new Alexa XT more people will record
arriraw i suppose).
++ chris
On 3/30/13 at 6:22 PM, [email protected] (Chris Noellert) wrote:
Exactly what I was going to mention. At this stage DNX strikes
me as being a much better alternative, especially when
considering all the strange gamma idiocy one runs into with QuickTime.
Best,
Chris
Sent from my iPhone
On Mar 30, 2013, at 8:04 AM, chris <[email protected]> wrote:
On 3/29/13 at 5:37 PM, (Martin Winkler) wrote:
Prores444 isn't lossless.
I'm not sure what makes people think that it was in the
first place.
i don't think that many people think it is, but it's a
*very* good tradeoff of quality vs file size with the
conveniences (and annoyances) of a quicktime file.
and while it's not lossless, the degradation i've seen so
far are virtually invisible and nowhere near the stuff in the
current case.
but how about contacting arri directly about the
artifacts?
i'd assume they'll have a clue what caused it, and if they
haven't i'm sure they'd be very interested to find out.
++ chris
ps: as a side note, i did some tests recently with
DNxHD185X for a greenscreen shoot, both in hardware (blackmagic
shuttle) capture and in software conversions, and had very
visible block artifacts in both when pulling the matte and
despill. ProRes422 on the other hand was very usable.
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