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ID:34520065
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页数:9页
时间:2019-03-07
《Blended Exposures Revisited - A Simpler Approach to Extending Dynamic Range.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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