Blended Exposures Revisited - A Simpler Approach to Extending Dynamic Range.pdf

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1、BlendedExposuresRevisitedASimplerApproachtoExtendingDynamicRange©2004,GlennE.MitchellII,Ph.D.ofTheLight’sRightStudio,http://www.thelightsrightstudio.comDigitalimagesshareanimportantfeaturewithcolortransparencyfilm.Theirdynamicrange–thedifferencebetweentheverybrightesthighlightsandtheverydark

2、estshadows–islimitedtoaboutfivestops.Thelightthatconfrontsalandscapephotographercangowellbeyondwhatadigitalcameracanrecord.Youeithergetover-exposedhighlightsorunder-exposedshadows.Thetraditionalsolutionforlandscapephotographerswastouseasplitneutraldensityfiltertoreducethedynamicrangeoftheima

3、ge.NowthatIhavemoved100%todigitalphotography,theonlyfilterIroutinelyuseisapolarizerfilter.MycollectionofCokinsplitNDfiltersnevergooutintothefield.NomorewavingafilterinfrontofmycameralensasItrytopeerthroughtheviewfinder,whiletryingtotriptheshutterreleasecordandkeepmybalanceonaslipperyrockinth

4、emiddleofastream.MichaelReichmannhaswrittentwoarticlesthatwalkphotographersthroughthestepsofcombiningtwoimagesintoone.Theprocessisthesameinbotharticles.Makesuretouseatripod.Taketwopictures.Oneimageisexposedforthehighlights.Theotherisexposedfortheshadows.AsMichaelrecommends,thisisbestdonebyus

5、ingauto-bracketing.http://www.luminous-landscape.com/tutorials/blended_exposures.shtmlhttp://www.luminous-landscape.com/tutorials/digital-blending.shtmlUsingtwoimagesworkswellaslongasthesubjectdoesnotmovebetweenexposures.Ifthesubjectdoesmove,youcanendupwithaghostedimage,especiallyifyoushootw

6、ithaslowshutterspeed.ItispossibletoshootinRAWanduseasingleimage.RAWconverters,likeAdobeCameraRawII,cangeneratemultipleversionsofthesameimage.SoitissimpleenoughtoproducebothanunderexposedimagewithhighlightdetailsandanoverexposedimagewithshadowdetailsfromthesameRAWimage.Ifyouaregoingtouseasing

7、leimage,however,besuretoreadMichael’sarticle“Expose(tothe)Right.”http://www.luminous-landscape.com/tutorials/expose-right.shtmlIfyoudonotexposetowardsthehighlightsandthentrytogetbywithasingleRAWimage,youcanwindupwithverynoisyshadowswhenyougeneratea