Return-Path: Received: from mail-pz0-f41.google.com ([209.85.210.41] verified) by media-motion.tv (CommuniGate Pro SMTP 4.2.10) with ESMTP-TLS id 4761516 for AE-List@media-motion.tv; Sun, 01 Jul 2012 11:07:11 +0200 Received: by dakp5 with SMTP id p5so5748049dak.28 for ; Sun, 01 Jul 2012 02:10:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date :x-google-sender-auth:message-id:subject:to:content-type; bh=rZOJ9jneMZ7DXadwMXyf4EQEdplLPTYO09/N4HaTK10=; b=OErN/RT06xGsZHHrMoEx5O5TbY/NPp5AfeIAYh6u31j6yJvD8APaN10YAgcPMs8rly cXjy7K5oElzZs/vTuwnVlXqti4J9+ndyw9d0V0bPCp7+Ri7iwEGK94dLNNznXkTG981o jPLTN28UDNWB6pDHPHiIkVsPabyswR9uUamVvueQS3QMSPgd7ZTVp55sQZwhxr5CbP5R InciYfhHIMVRZXPOtCWsL1e3stE+wqiLe2f+9g5/fAsPQwgLDOTw6pnYJliiOU7JWOYZ CyEdH5q3Kzt2zXg7Tdt3UO5ZUgr3+q8Dm5mxQkRraa1j/BM0OBuvbgbskcxuYx1MaAic hMRw== Received: by 10.68.218.103 with SMTP id pf7mr20759035pbc.67.1341133824435; Sun, 01 Jul 2012 02:10:24 -0700 (PDT) MIME-Version: 1.0 Sender: mrbills@gmail.com Received: by 10.142.52.19 with HTTP; Sun, 1 Jul 2012 02:10:04 -0700 (PDT) In-Reply-To: References: From: J Bills Date: Sun, 1 Jul 2012 02:10:04 -0700 X-Google-Sender-Auth: 13i6nMjncOaS95wozqJyO2b8OEE Message-ID: Subject: Re: [AE] Lens Distortion To: After Effects Mail List Content-Type: multipart/alternative; boundary=e89a8ff2568033a46e04c3c10d0a --e89a8ff2568033a46e04c3c10d0a Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable IMHO, the only safe way to reliably deal with lens distortion is to take a couple of mins out and shoot a grid with the same camera/lens (and even down to the focus setting) on set. most grip trucks have a 4x8 piece of plywood and most kinkos can print & laminate you a 4x8 grid to clamp to it. it's not as good as the laser etched grids that can be bought but it's a reasonable facsimile. watch out for glare off of that lamination. I like the WarpD module in 3d Equalizer for solving the distortion, but most tracking software has some equivalent and surely the values could be adapted for optics compensation. Nuke's lens distortion tools are pretty good too. the good news is, a lot of the modern camera/lens combos are darn near rectilinear. an 18mm on a Red Epic is surprisingly straight. it's when you get into the old pawn shop Nikon glass stuck on a 5D that you start to have to worry. oh god there was this one tilt shift lens that made my life very difficult on a few shots... adobe has a pdf floating around (i think buried in the photoshop or lightroom stuff somewhere) that introduces the idea of "lens profiling," which in theory could automate some of this type of stuff, and possibly be driven off of metadata. the way they were wanting to deal with the distortion seemed pretty cool - you could hold up a smaller grid and take 9 stills, with the small grid held up in the lower left, lower center, lower right and so on. photoshop would then stitch them together and solve the distortion for the whole lens. interesting! On Fri, Jun 29, 2012 at 9:47 AM, Chris Meyer wrote: > Exactly. And why the %&()*@! Bridge or AE's XMP Metatdata panel don't > automatically access this=85 Of course, it doesn't help that other apps s= eem > to lose this information when I trim and extract selects. > > deadline; grumpy - > Chris > > > On Jun 29, 2012, at 10:36 AM, Stephen van Vuuren wrote: > > >(Point of frustration: When I take stills with my 5D, the lens > information appears in Bridge; when I shoot video with the same camera, I > am hard pressed to find the same information in either Bridge or AE.)**** > ** ** > With most Canon DSLRs, that=92s found in the .THM file with the video. Se= ems > like easy work for script or simple-plugin to read that into AE etc.**** > ** ** > *stephen van vuuren* > 336.202.4777**** > * * > *http://www.sv2dcp.com/* > *http://www.sv2studios.com/* > *http://www.outsideinthemovie.com/* > * * > *A film is =96 or should be =96 more like music than like fiction. It sho= uld > be a progression of moods and feelings. The theme, what=92s behind the > emotion, the meaning, all that comes later.* > =96*Stanley Kubrick***** > > > --e89a8ff2568033a46e04c3c10d0a Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable IMHO, the only safe way to reliably deal with lens distortion is to take a = couple of mins out and shoot a grid with the same camera/lens (and even dow= n to the focus setting) on set.

most grip trucks have a 4x8 piece of= plywood and most kinkos can print & laminate you a 4x8 grid to clamp t= o it.=A0 it's not as good as the laser etched grids that can be bought = but it's a reasonable facsimile.=A0 watch out for glare off of that lam= ination.

I like the WarpD module in 3d Equalizer for solving the distortion, but= most tracking software has some equivalent and surely the values could be = adapted for optics compensation.=A0 Nuke's lens distortion tools are pr= etty good too.

the good news is, a lot of the modern camera/lens combos are darn near = rectilinear.=A0 an 18mm on a Red Epic is surprisingly straight.=A0 it's= when you get into the old pawn shop Nikon glass stuck on a 5D that you sta= rt to have to worry.=A0 oh god there was this one tilt shift lens that made= my life very difficult on a few shots...

adobe has a pdf floating around (i think buried in the photoshop or lig= htroom stuff somewhere) that introduces the idea of "lens profiling,&q= uot; which in theory could automate some of this type of stuff, and possibl= y be driven off of metadata.=A0 the way they were wanting to deal with the = distortion seemed pretty cool - you could hold up a smaller grid and take 9= stills, with the small grid held up in the lower left, lower center, lower= right and so on.=A0 photoshop would then stitch them together and solve th= e distortion for the whole lens.=A0 interesting!


On Fri, Jun 29, 2012 at 9:47 AM, Chris M= eyer <chris@crishdesign.com> wrote:
Exactly. And why the %&()*@! Bridge= or AE's XMP Metatdata panel don't automatically access this=85 Of = course, it doesn't help that other apps seem to lose this information w= hen I trim and extract selects.

deadline; grumpy -
Chris


On Jun 29, 2012, at 10:36 AM, Stephen = van Vuuren wrote:

= >(Point of frustration: When I take stills with my 5D, th= e lens information appears in Bridge; when I shoot video with the same came= ra, I am hard pressed to find the same information in either Bridge or AE.)=
=A0
With most Canon DSLRs, that=92s found in the .THM file with the video. S= eems like easy work for script or simple-plugin to read that into AE etc.
=A0
= stephen van vuuren
=A0
http://www.outsideinthemovie.com/<= /div>
=A0
A film is =96 or should be =96 more like music than like fiction. It = should be a progression of moods and feelings. The theme, what=92s behind t= he emotion, the meaning, all that comes later.
=96Stanley Kubrick



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