Tải bản đầy đủ - 0 (trang)
Hack 68. Change a Scene from Day to Night

Hack 68. Change a Scene from Day to Night

Tải bản đầy đủ - 0trang

Whileusingyoureditingapplication,locatethesceneyouwouldliketoalterand

selectit.Then,openthecolorcorrectiontool:



Avid

Toolset



ColorCorrection



FinalCut

Effects



VideoFilters



ColorCorrection3-way



MovieMaker

UsePixelan'sSpiceFXPackE1:CorrectionEffects

(http://www.pixelan.com;$14)



Premiere

Window



Workspace



ColorCorrection



iMovie

UseGeeThree'sSlickEffects:Volume6(http://www.geethree.com;$69.95)

Thereareafewkeytermstobefamiliarwithwhencolorcorrecting:



Chrominance(a.k.a.chroma)



Thepartofavideosignalthatincludesthehueandsaturation



Gamma

Thepartofthevideosignalthatincludestheintensityandaffectsdetails



Luminance

Thepartofavideosignalthatincludesthebrightness

Inordertocreatetheday-for-nighteffect,youwillneedtomanipulatethe

Chroma,Gamma,andLuminance,inadditiontoalteringtheblacks,whites,and

midtones.Dependingonthefeaturesofyoureditingsystemortheplug-inyou

havechosentouse,yourresultswillvary.Additionally,everyshotisdifferent,

duetolighting,thecameralensused,andcolorcompositionofthescene,soyou

willneedtoadjustaccordingly.Figure6-24showstheoriginalimagenexttoa

day-for-night-effectedimage.

Figure6-24.MeleKalikimaka,duringthedayandatnight



6.9.2.ReducingtheLuminanceandChrominance

Oneofthefirststepsincreatingtheday-for-nighteffectistoreducethe

luminanceandchrominanceofyourscene.Obviously,byreducingthe

luminance,youwilllosesomeofyourscene'sclarity.But,thenagain,whenyou



arewalkingaroundatnight,youcan'tseeasclearlyasduringtheday.Right?

Youwillalsowanttoreducethechrominance.Thiswillcausesomeofthe

subjectsofyourscenetonotstandoutasmuch.Aswithallofthechangesyou

areapplying,youwillneedtoexperimenttoseehowmuchchrominanceyou

needtoremove.Figure6-25showstheimagewiththeluminanceand

chrominanceadjusted.

Figure6-25.Animagewithalteredluminanceandchrominance



6.9.3.ReducingtheGamma

Ifyouhavetheabilitytoreducethegammaofyourscene,youshoulddoso.

However,keepinmindthatalittlecangoalongwaywhendealingwithgamma

settings.Figure6-26showstheimagewithaslightlyadjustedgammalevel,

from1.0to0.95.

Figure6-26.Slightlyadjustingthegammalevel



6.9.4.PushingtheBlacks

Inordertoaddablue-purplehuetoyourscene,youcanpushyourblacksmore

towardthebluerangeofthecolorspectrum.Youdonotwanttogotoofarinto

blue,however,becauseyourimagewillbegintotakeonanalmostbizarrefeel.

Figure6-27showstheimagewiththeblackspushedtowardblue.

Figure6-27.Pushingtheblackstowardblue,beginningtogivea

nightlook



6.9.5.MovingtheMidtones

Topushtheimageevenmoretowardtheblue-purplehueofnight,pushthe

midtonesoftheimagetowardblueaswell.Theinitialeffectmightbealittle

startling,andyourknee-jerkreactionmightbetonotpushtoofar,soyoumay



havetorevisityourmidtonesafewtimesasyouadjustyourimagetothedesired

look.Figure6-28showstheimagewiththemidtonespushedtowardblue.

Figure6-28.Asensethatit'sgettinglaterintheday…



6.9.6.PushingtheWhites

Afteryou'veputsomuchblueintoyourimage,you'llprobablyberelievedto

findoutyougettoplayattheothersideofthespectrum.Whendealingwiththe

whites,youwillwanttopushthemtowardyellow.Thisseemsalittlestrange,

butitwillbringoutsomeofthewhiteswithinalloftheblue.Figure6-29shows

theimagewiththewhitespushedtowardtheyellowsideofthespectrum.

Figure6-29.Pushingthewhitestowardtheyellowsideofthe

spectrum



6.9.7.ReducingtheSaturation

Last,butdefinitelynotleast,youwillwanttoreducethesaturation.Bydoingso,

youwillbringdowntheintensityofrestofthecolorswithintheimage.Itwill

alsobringyourimagebackfromtheworldoftheoverlycolored.Figure6-30

showstheimagewiththesaturationreducedbyover50%.



Figure6-30.Alteringthecolorstauration



Colorcorrectionisaverypowerfulmethodofalteringthelookofyourvideo.

Whetheryouwanttochangeashotfromdaytonight,orsimplygiveyourvideo

auniqueimpressionallyourown,usingcolorcorrectiontoolsandtechniques

willgiveyoutheability.



Hack69.CreateaCreditFlag



Mostdigitalvideosoftwareenablesyoutoeasilycreatetextonscreen.Some

areevenquiteadvancedandcancreatereallycooltitles.Butsometimes,a

morerudimentaryapproachcanyieldequallyimpressiveresults.

Mostmoviesbeginwithanopeningsceneandalistofpeople'snamesandtitles

superimposedoverit.ThisisknownastheTitleSequence.Takingasimplistic

methodtocreatingcredits(Icallthemethodcreditflags)willcausepeopleto

wonder,"How'dtheydothat?"



6.10.1.PreparingYourFlags

First,youwillneedtogatherafewsupplies:alargeswatchoflightweightwhite

fabric,ablackmarker,awoodenormetalpole,andafan.Youwillalsowanta

pairofscissorsandwaytoattachthefabrictothepole,suchasastapler,push

pins,oreventape.Figure6-31showsasamplesetoftherequiredmaterials.

Figure6-31.Toolstocreateyourcredits



Afteryouobtainthenecessarymaterials,cuttheclothintosquareslargeenough

towriteonusingthemarker.Forexample,whencreatingyourpersonalcredit

flag,youwillneedasquareofclothlargeenoughtowrite"WrittenandDirected

by:Me!"inbig,blackletters.Howyouwriteandlayoutthelettersisamatterof



personaltaste.Youshouldcreateaflagforeachperson,orgroupofpeople,you

wouldliketoprovideanon-screencredit.



6.10.2.RecordingYourFlags

Afteryouhavecreatedyourflags,youarereadytoassembleacreditflagand

recordyourvideo.Tocreatetheflag,attachthesquareofclothtoyourpole.

Thenstandthepoleupright,withthefanaimedatthesideoftheflag.

Youwillneedtosetandfocusyourcameraontheflag.Makesurethattheflag

fillsthescreen,evenwhenbeingblownaboutbythefan.Ifyounoticethereare

darkshadowsontheflagwhileitisblowingaround,youshouldprovide

additionallightonitinordertoreducetheirappearance.



Toprovidealittlemoreroomforerror,youmightwanttorecordyour

footageagainstawhitebackground.Ifyoudon'thaveafan,youcan

manuallywavetheflag,byholdingthepolehorizontallyandrollingit

backandforth.



Afteryouhavesetyourcamera,beginrecording.Capturingaround30seconds

perflagshouldprovidemorethanenoughfootage.Repeattheprocessuntilallof

thepeopleimportanttoyourmoviehavehadtheirflagsrecorded.Yourfinal

videowillthenneedtobeimportedintoyoureditingsystem.Figure6-32shows

acreditflag,asimportedintoAdobePremierePro.

Figure6-32.Aflag,soontobecomeacredit



Tài liệu bạn tìm kiếm đã sẵn sàng tải về

Hack 68. Change a Scene from Day to Night

Tải bản đầy đủ ngay(0 tr)

×