[Konvas] color correction in post (was: first test time lapse ... with 7D)

[colcam at aim.com]

 Both right and wrong.  It started with the DLP problems, and while it is vital for the 4k projection the odds are it will work downward to even home systems very quickly.  The problem "was" that the processing power required was too great for even a large theater setup, and thus the RGB system was used-- it needed almost no processing power-- and they were working toward the day when a the magical, mystical, far, far into the future 64 bit, 1 ghz, 4 gigs of memory processor might one day be available.  

That side of the coin caught up and passed the standard while they were still trying to look at the HD/2k systems. 

That's more or less where the issues are now-- the RGB versus CMYK systems make it clear that "now" RGB has the base and size, but if you could define each pixel and it refreshed only as changes are made, and at a much higher rate, then you could get rid of the progressive scan artifacts if you could put it in the capture AND the display aspects.  That's what the "S" system does, and it turns out that it is needed for 4k and 8k projection, and that it is good for both display and capture at any resolution.  It just means that each pixel now has its own control and channel, which means brightness cannot be part of it.  Where the "red plus blue" brightness gave different purples, now each purple is fixed in definition.  They can do it now, for projection, and the future is there for capture, too.  The problem is that too many people want to stay with what they have, but the LCD pixel by pixel refresh HDTV sets are on the market-- as a ready base for future improvements.

Look at your computer screen, see if it scans line by line progressive, or it is a pixel by pixel refresh. 

The designers got caught napping.

 


 

 

-----Original Message-----
From: Adam Frey <thefirstrule at chainsawlinux.com> 


I'm assuming this is, more-or-less, strictly for high end 4k projection, and not 
for the average home pc or home theater.

Adam Frey


-----Original Message-----
From: colcam at aim.com
Sent: Saturday, March 13, 2010 11:18 AM
To: cinema at konvas.org
Subject: Re: [Konvas] color correction in post (was: first test time lapse ... 
with 7D)


 Most of what has been "published" is math and technical applications of things 
that don't yet really exist, and are only available to members of the technical 
groups.

Remember that the idea is to go to something that deals with this on a 600hz 
"refresh only the changed pixels" reflection system and what might sound like a 
huge step backward might mean that the tools you are using are the problem-- the 
reason the image size, refresh, and color standards need to be replaced, the 
first step being to get rid of the progressive scan and the brightness 
adjustment within a color.  Because the amount of light being dumped onto the 
reflectance chip is uniform the RGB methods of determining brightness don't work 
because they are based on creation of a pixel of light or the transmission of 
light, which is variable. 

 


 

 

-----Original Message-----
From: Mike_Wilkins <mikewi at mac.com> 


On 12/03/2010, at 8:28 AM, colcam at aim.com wrote: 
> In a nutshell, one starts by beating your head against the wall and > crying. 
 
CMYK for video/film sounds like a huge regression to me when all the tools in 
the post world are based on RGB workflows. Is there some document online that 
discusses this as a serious 4K projection pipeline ? 
 
In terms of timelapse colour correction I now use the Adobe Camera Raw plugin 
(5.6) to open RAW 5DmkII sequences in After Effects CS4. You get to do a global 
adjustment on import, then I use a combination of Magic Bullet Looks (avoiding 
all presets), Colorista and Color Finesse. I create a 1920x1080 32bit float 
sequence and turn off the project colour correction, which I find inconsistent 
(or consistently incorrect). I usually render to a prores master on the Mac. Let 
me know if you need more detail, 
 
Cheers 
 
Mike 
 
Mike Wilkins  

 
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