Re: 2.35 matte

[Ryan Collier <rcollier(at)postcentral.com>]

Revised:

Crop top/bottom: 105

Previous post was for square based footage (HD)

See below.

Cheers,

Ryan Collier
Avid|DS Artist

~ The Past is Prologue ~

Subject: Re: 16:9 Help....Square guy in Letterbox Quag
From: spencer <spencerhecox(at)sbcglobal.net>
Date: Mon, 29 Aug 2005 16:45:44 -0700

I should update my math because I wasn't factoring in the the fact that
NTSC has a 0.9 Pixel ratio. HD has a 1.0 Pixel ratio. This changes the
math a little for a NTSC Crop.

720/1.777778 = 404.9999(or 405) -- this would work if NTSC was Square
Pixels like HD


I believe this is a more accurate 16:9 calculation for Square Pixel
Images that are placed into a NTSC (0.9) world.

720*0.9 = 648
648/1.777778 = 364.5
486 - 364.5 = 121.5
(Or roughly a 61 pixel crop off the top and bottom of your NTSC image.
This would mimic the look that you get when you bring an HD image into
a NTSC world.)

So for the rest you'd get these numbers:
720*0.9 = 648
648/1.777778 = 364.5
486 - 364.5 = 121.5 (If you round up 61 pixel crop off top and bottom)

720*0.9 = 648
648/1.85 = 350.2703
486 - 350.2703 = 135.7297 (If you round up 68 pixel crop off top and
bottom)

720*0.9 = 648
648/2.35 = 275.7447
486 - 275.7447 = 210.2553 (If you don't round: 105 pixel crop off top
and bottom)


_spencer


On Nov 8, 2005, at 7:19 PM, Igor Ridanovic wrote:

Does anyone know the crop numbers for 2.35 matte so I don't have to  
calculate them?

--


Igor Ridanovic
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3619 W. Magnolia Blvd.
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(818) 843-3400  (818) 559-2418 fax
http://www.kappastudios.com


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