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Adventures of Robin Hood image dither?

 
 
anthony
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      10-04-2003
Has anyone noticed in some scenes of the new Warner edition that there
is what appears to be a very fine film grain which in fact is some
sort of slight 'dither' effect.
Whatever the cause (intentional?), the result is excellent.
This very slight 'dither' has the effect on my 100-hertz Loewe Profil
TV of eliminating the effect I see on some very good rock-solid
transfers, of the viewer being able to see the resolution lines on the
screen.
The 'dither' interferes with that, and fools us (well, me anyway) into
seeing a virtual high-res image on my conventional cathode-ray screen.
 
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Steve(JazzHunter)
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      10-04-2003
On 3 Oct 2003 17:58:08 -0700, http://www.velocityreviews.com/forums/(E-Mail Removed) (anthony) wrote:

>Has anyone noticed in some scenes of the new Warner edition that there
>is what appears to be a very fine film grain which in fact is some
>sort of slight 'dither' effect.
>Whatever the cause (intentional?), the result is excellent.
>This very slight 'dither' has the effect on my 100-hertz Loewe Profil
>TV of eliminating the effect I see on some very good rock-solid
>transfers, of the viewer being able to see the resolution lines on the
>screen.

This dither is an effect than has been done for several years to avoid
jaggies and a "flitter" effect on sligthly moviing horizontal lines
(such as variations in film registration. If a film image is simply
scanned, the information on the film between the lines is missed, a
tiny pattern on the film might pop in and out of scan, thus flickering
in and out, causing the Sparkle or "flitterr" effect.. Widening the
scan lines to not have gaps decreases the overall focus and maximum
reslution, also there is some flitter still as the outside of the line
is less bright or sensitive. To bias or dither or wobble the scan dot
eliminates all of these, the whole film is covered, there's no
flitter, and the maximum focus is maintained.

>The 'dither' interferes with that, and fools us (well, me anyway) into
>seeing a virtual high-res image on my conventional cathode-ray screen.


The point beimg that you're seeing some detail above and below the
scan lines that were buried in the dark before.

Steve .

 
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anthony
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      10-04-2003
Thanks Steve
I guess some transfer specialists manage it better than others -- this
example is just brilliant.
 
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Gary Quinton
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      10-05-2003
On 4 Oct 2003 00:18:19 -0700, (E-Mail Removed) (anthony) wrote:

>I guess some transfer specialists manage it better than others -- this
>example is just brilliant.


Are we talking about the same 'line resolution' I see on Nicole
Kidman's white face in Moulin Rouge when she is on the swing?


GaryQ

 
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