Return-Path: Received: from eatspam.slcc.edu ([144.35.15.69] verified) by media-motion.tv (CommuniGate Pro SMTP 4.2.10) with ESMTP id 4625848 for AE-List@media-motion.tv; Tue, 14 Feb 2012 17:17:24 +0100 X-ASG-Debug-ID: 1329236618-0439c31286907e60001-edO5QZ Received: from vCAS2.slcc.int (vcas2.slcc.int [10.1.11.53]) by eatspam.slcc.edu with ESMTP id pC80OC54HcHtWHvK for ; Tue, 14 Feb 2012 09:23:38 -0700 (MST) X-Barracuda-Envelope-From: John.Morgan@slcc.edu Received: from EXCH.slcc.int ([127.0.0.1]) by vCAS2.slcc.int ([fe80::8031:551b:9a53:7716%11]) with mapi; Tue, 14 Feb 2012 09:23:38 -0700 From: John Morgan To: After Effects Mail List Date: Tue, 14 Feb 2012 09:23:37 -0700 Subject: RE: [AE] fluorescent flicker in video Thread-Topic: [AE] fluorescent flicker in video X-ASG-Orig-Subj: RE: [AE] fluorescent flicker in video Thread-Index: AczrMch1Vw99LitETsKVmGrC/XIcvgAAkpDw Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_EAE675A223415848A14AA69EBCDE9D0A5913844630EXCHslccint_" MIME-Version: 1.0 X-Barracuda-Connect: vcas2.slcc.int[10.1.11.53] X-Barracuda-Start-Time: 1329236618 X-Barracuda-URL: http://eatspam.slcc.edu:8000/cgi-mod/mark.cgi X-Virus-Scanned: by bsmtpd at slcc.edu X-Barracuda-Spam-Score: 0.00 X-Barracuda-Spam-Status: No, SCORE=0.00 using global scores of TAG_LEVEL=1000.0 QUARANTINE_LEVEL=1000.0 KILL_LEVEL=6.0 tests=HTML_MESSAGE X-Barracuda-Spam-Report: Code version 3.2, rules version 3.2.2.88536 Rule breakdown below pts rule name description ---- ---------------------- -------------------------------------------------- 0.00 HTML_MESSAGE BODY: HTML included in message --_000_EAE675A223415848A14AA69EBCDE9D0A5913844630EXCHslccint_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I've seen the color pulsing 'over several minutes' thing happen on an HPX17= 0 in auto iris mode in fluorescent lighting. Was a camera used for student = shooting that I'd not had time to check settings on. I shoot an HPX500 and = PMW-F3 in 720 24pN and 720p 23.98 modes respectively and have never noticed= flickering or color phasing with the settings I use. There is the possibil= ity of a fluorescent light or ballast going bad in one of the lights in the= shot. In that case it would not be a camera setting. John From: After Effects Mail List [mailto:AE-List@media-motion.tv] On Behalf Of= Steve Oakley Sent: Tuesday, February 14, 2012 9:00 AM To: After Effects Mail List Subject: Re: [AE] fluorescent flicker in video 24P on nearly all video cams is actually 23.976 ( some cameras can be set t= o 24.000 which is flicker safe ) and it very much can flicker or produce ro= ll bars. line frequency is 60.000hz and only 24.000 and 30.000 are actuall= y "flicker free" safe for 180deg shutter speed. that fraction off does matt= er - I have seen one example where the color shifts over several minutes a= s the lights change phase with the camera under flo lighting. if you scan thru the footage at 5 or 10X it can be pretty easy to spot dark= roll bars in the footage. this freaks most people out. in reality, played = at normal speed, its generally not noticeable UNLESS you know its there, yo= u're looking for it, and you have a pretty bad case of it. most of the time= , the average view will never see it or notice it.... or care :( steve o On Feb 14, 2012, at 9:09 AM, John Morgan wrote: Can you describe the video's settings? I shoot in fluorescent all the time = @ 720p24 180=B0 shutter and don't see any flickering. John From: After Effects Mail List [mailto:AE-List@media-motion.tv] On Behalf Of= Greg Bacon Sent: Tuesday, February 14, 2012 7:56 AM To: After Effects Mail List Subject: [AE] fluorescent flicker in video Hi All, I just received some video footage of a 'clean' room where the camera perso= n forgot to compensate for the fluorescent lights. The video has this flic= ker in it... do any of you know how to compensate after the fact to reduce = it? Greg This message, and any attachments, is intended only for the use of the addr= essee and may contain information that is privileged and confidential or ot= herwise exempt from disclosure under applicable law. If the reader of this = e-mail is not the intended recipient, you are hereby notified that any unau= thorized use, dissemination, distribution or reproduction of this message i= s prohibited. If you have received this communication in error, please noti= fy the sender by return e-mail and delete this e-mail and any attachments f= rom your system. =AD=AD This message, and any attachments, is intended only for the use of the addr= essee and may contain information that is privileged and confidential or ot= herwise exempt from disclosure under applicable law. If the reader of this= e-mail is not the intended recipient, you are hereby notified that any una= uthorized use, dissemination, distribution or reproduction of this message = is prohibited. If you have received this communication in error, please no= tify the sender by return e-mail and delete this e-mail and any attachments= from your system.= --_000_EAE675A223415848A14AA69EBCDE9D0A5913844630EXCHslccint_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I’v= e seen the color pulsing ‘over several minutes’ thing happen on= an HPX170 in auto iris mode in fluorescent lighting. Was a camera used for= student shooting that I’d not had time to check settings on. I shoot= an HPX500 and PMW-F3 in 720 24pN and 720p 23.98 modes respectively and hav= e never noticed flickering or color phasing with the settings I use. There = is the possibility of a fluorescent light or ballast going bad in one of th= e lights in the shot. In that case it would not be a camera setting.

 

John

 

From: After= Effects Mail List [mailto:AE-List@media-motion.tv] On Behalf Of Ste= ve Oakley
Sent: Tuesday, February 14, 2012 9:00 AM
To: = After Effects Mail List
Subject: Re: [AE] fluorescent flicker in = video

 

24P on nearly all video cams is actually 23.976 = ( some cameras can be set to 24.000 which is flicker safe ) and it very muc= h can flicker or produce roll bars.  line frequency is 60.000hz and on= ly 24.000 and 30.000 are actually "flicker free" safe for 180deg = shutter speed. that fraction off does matter -  I have seen one exampl= e where the color shifts over several minutes as the lights change phase wi= th the camera under flo lighting.

<= o:p> 

if you scan thru the fo= otage at 5 or 10X it can be pretty easy to spot dark roll bars in the foota= ge. this freaks most people out. in reality, played at normal speed, its ge= nerally not noticeable UNLESS you know its there, you're looking for it, an= d you have a pretty bad case of it. most of the time, the average view will= never see it or notice it.... or care :(

 

steve o

 

On Feb 14, 2012, at 9:09 AM, John Morgan wrote:<= /o:p>



Can you describe the video’s settings? I shoot = in fluorescent all the time @ 720p24 180=B0 shutter and don’t see any= flickering.

Jo= hn

 

From: <= /span>After Effects Mail List [mailto:AE-List@media-motion.tv] On Behalf Of Greg Bacon
Sent: Tuesday, February 14, 2012 7:56 AM
To: After Effects Mail ListSubject: [AE] fluo= rescent flicker in video

 

Hi All,

=  

I just received some video footage of a 'clean' room where the camera= person forgot to compensate for the fluorescent lights.  The video ha= s this flicker in it… do any of you know how to compensate after the = fact to reduce it?

 

Greg


Thi= s message, and any attachments, is intended only for the use of the address= ee and may contain information that is privileged and confidential or other= wise exempt from disclosure under applicable law. If the reader of this e-m= ail is not the intended recipient, you are hereby notified that any unautho= rized use, dissemination, distribution or reproduction of this message is p= rohibited. If you have received this communication in error, please notify = the sender by return e-mail and delete this e-mail and any attachments from= your system.  =AD=AD  

 


This message, a= nd any attachments, is intended only for the use of the addressee and may c= ontain information that is privileged and confidential or otherwise exempt = from disclosure under applicable law. If the reader of this e-mail is not = the intended recipient, you are hereby notified that any unauthorized use, = dissemination, distribution or reproduction of this message is prohibited. = If you have received this communication in error, please notify the sender= by return e-mail and delete this e-mail and any attachments from your syst= em.  ­­  = --_000_EAE675A223415848A14AA69EBCDE9D0A5913844630EXCHslccint_--