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1、摄影技术发展史（Thehistoryofphotography）ThisarticleiscontributedbyuufeixhiDOCdocumentsmayexperiencepoorbrowsingontheWAPside.ItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalview.Thehistoryofphotographyfromthesceneifbrightreflectedlight,in
2、toadarkroomthroughasmallhole,canbeontheoppositewall,thescenetoformadimfigure,theimageisupsidedown,becausethelightfromtheobjecttotheupper,loweronlyexposuretothewall,fromthelowerpartoftheupperlight,onlyexposuretothewalls.Thedarkroomimagingphenomenoninan
3、cienttimeshasbeenknownfor.1558years,Gwavetower(GiovanniPorta)hadtobeclearlydescribed.Darkroomimagingisaboutatthistime,peoplehavefoundthesmallholesinthewallsofthedigging,loadingatelescopelens,itcanformabrighterandclearerimage.Asthesedarkroomhouses,main
4、lylocatedinpublicbuildingsorparks,forpeopletowatch.Somestillretained.ByseventeenthCentury,aSomesmallportablecameraobscura(cameraobscura),isoftenusedasauxiliarytools.Theywilldrawartistsenclosedboxinasedanchair,transportforshort,blackboxontopofalensanda
5、reflectivemirror.Themirrorwillreflectlightintheblackboxinthedrawingboard,erecttheimage.Somereflectiveblackbox,canputonthetable.Somemayevenbeputinhand.Intheblackbox,imagecanbedirectlypaintedinthepaper.Theinventionofperspectiveandproportionaccuratelydep
6、ictthelandscapearchitecture,isveryuseful.Thebasicprincipleofdarkroom.Becausethelightisgostraight,soasmallholecanbethesunshineinthedarkscenetoformaroughimage.Photographicmaterialsformanycenturies,itwasknownthatsomesubstancesafterlongtimeexposuretosunli
7、ght,willturnblack,orfade.Forthischange,peopleoftenthinkthatislikecooking,asthe"hot",andnotbecauseof"light"inaction.Somesilvercompoundsareparticularlysensitive.Asearlyas1727,theGermanJSchultz(JSchulze)professorhasshownthatsilvernitrateandamixtureofwhit
8、epigmentsolution,placedinaglassbottle.Thatwillbethesidefacingsunlightdark.Hepointedoutthatthesingleisnotproducethiseffect.Atthistime,youmightthink,artistsandscientistsofthesecretchemicalphotographicmaterials,canbecombinedtogethertocreatephotog
