[Tig] Studies of TV contrast enhancement?
erik at monkeyswithchopstix.com
Thu Feb 25 00:45:14 GMT 2010
To be blunt... This will never happen. Within the professional
industry there is no standard, so for the consumer space there is
At the HPA Tech Retreat last week Charles Poynton suggested that there
should be no controls whatsoever on displays. They should all be setup
the same. He also said that even though he was on the comittee that
setup Rec709, Rec709 is broken as a standard. I have to go through my
notes if I can find the exact reasoning but nonetheless.
Actually my notes as written are "Rec709 does not map signal to
light". Later I wrote "all current mastering is done with SMPTE
phospurs with Rec709 display/distribution..."
As a display unit the most interesting coat effective setup was a
Panasonic 11/12 series plasma with a Cinetal Davio processing unit.
Peter Putman of ROAM and Panasonic were showing this.
If you understand everything, you must be misinformed.
- Proverb, (Japanese)
On Feb 24, 2010, at 2:43 PM, Bob Friesenhahn <bfriesen at simple.dallas.tx.us
> Sohonet http://www.sohonet.co.uk sponsors the TIG.
> 2030 subscribers in February 2009.
> Company 3 supports the TIG.
> Is anyone aware of a study of the effect of artificial contrast
> enhancement which is built into modern TVs? For example, use of a
> high-grade video camera or still camera to capture what TVs actually
> display so that it can be compared with the original?
> After delivery of my own Samsung TV, I was immediately struck by the
> huge changes which can occur to the image and that the changes made
> are quite image dependent. I have observed gross changes on other
> people's TVs as well. On some TVs (probably using default
> settings), the image is like a caricature of the original, with
> extreme contrast and saturated colors. For sports programs this
> "caricature" effect may be intended, but it does not satisfy at all
> for film or drama programs.
> It may be that each vendor uses a different algorithm, but perhaps
> there are similarities as well. With enough knowledge of how TVs
> actually behave, there may be tricks which could be employed on the
> front end (e.g. intentional non-obvious distortion) so that the
> displayed result remains closer to what the colorist saw on his
> studio monitor.
> Bob Friesenhahn
> bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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