Chromatic aberration nyob rau hauv cov duab

Chromatic aberration - ib yam ntawm cov duab distortions sawv los ntawm tus neeg txhaum ntawm optics. Qhov no tshwm sim yog vim lub dispersion ntawm lub teeb raws li nws kis tau los ntawm lub lens. Nws yog vim lub fact tias cov rays coj txawv wavelengths (txawv xim) muaj ib tug txawv refractive index. Dawb lub teeb yog decomposed mus rau hauv lub spectrum ntawm tag nrho cov xim, thiab cov xim muaj refracted ntawm ces kaum sib txawv thiab siab rau sib txawv dav hlau.

Chromatic aberrations feem ntau ua rau cov tsos ntawm cov xim contour ntawm me ntsis thiab kab txaij, uas thiaj li duab sharpness thiab tshwj xeeb yog hnov ntawm qhov kev hloov zoo khoom. Ib tug piv txwv zoo yog ib tsob ntoo los yog ib lub tsev tua tiv thaiv lub keeb kwm ntawm lub tshav ntuj ntuj. Feem ntau cov xav no kho raws yog qhia nyob qhib aperture.

Niaj hnub nimno lo ntsiab muag (ie lo ntsiab muag muab chromatic aberration) siv tsawg-dispersion hais tias muab tsawg refraction thiab ib tug dlaim phaj daim duab. Nyob rau hauv Nikon lo ntsiab muag txoj kev yog denoted los ntawm ED (Extra-Low Dispersion) kos npe rau. Rau lub hom phiaj no yog siv aspherical lo ntsiab muag, uas ib daim duab nrog ib tug me me muaj pes tsawg tus ntawm xws tsis xws luag. Tseem muaj cov koob yees duab nrog automatic tswj ntawm aberrations.

Tab sis, yog hais tias ib tug uas twb muaj lawm lens tseem muab cov distortions, muaj ntau txoj kev yuav kam nrog lawv. Koj yuav thov tau cov ntxaij lim dej, kho kom raug cov duab nyob rau hauv ib tug ntawm cov neeg kho, los yog siv ib tug plug-suppressing chromatic aberration. Yuav ua li cas kom tshem tawm cov artifacts siv Adobe Fhotoshop kev pab cuam sai sai thiab yooj yim? Ib tug ntawm cov kev xaiv uas qhia hauv qab no.

Qhib lub RAW ntaub ntawv nyob rau hauv Photoshop, nws yog khaws los ntawm tsev av koob yees duab Nyoos. Tom ntej no, mus rau lub Lens Corrections tab. Nyob rau hauv parameter Defringe qhia kom meej Tag nrho sawv, ces tus rims yog tsawg kaj. Tam sim no pib mus rau sliders - thawj liab / Cyan kom txog thaum txog thaum fade xiav fringe, ces Blue / Daj kom txog rau thaum lub caij thaum cov xim ntawm lub mis yuav ploj. Tag nrho cov yees duab yog npaj txhij.

Duab nyob rau hauv JPEG hom yuav tsum edited nrog xws li ib lub lim raws li lub distort - Lens Kho. Nws yog ib qho yooj yim uas yuav tau tshem ntawm chromatic aberration thiab siv qhov kev pab cuam tsev av Lightroom. Qhov kom zoo dua ntawm lub yav tas yog hais tias los ntawm tus kws kho ib zaug xwb txhaj koob tshuaj tivthaiv, koj muaj peev xwm siv lub tib lub chaw rau tag nrho cov series nrog synchronization.

Qhov yooj yim, tab sis tsis yeej ib txwm qhov tseeb txoj kev uas yuav tshem tawm cov annoying artifacts - mus rau cov hloov hauv daim duab mus rau dub thiab dawb hom los yog thaum pib mus tua nyob rau hauv cov xim dub thiab dawb. Nyob rau hauv tas li ntawd, peb paub tias tus lens suffers los ntawm xws li ib tug drawback, nws yog tsim nyog yuav tsum tsis txhob txhaj tshuaj qhib wide.

Cov feem ntau tshwm sim nyob rau hauv lub chromatic aberration lens muaj ib tug loj multiplicity ntawm lub zoom. Qhov no yog hais tias txawv focal lengths, cov distortions yog manifested nyob rau hauv ntau txoj kev, nws yog ib yam nyuaj heev thiab yog li ntawd xam thiab pab kom txawm peem rau tag nrho cov tau tsis xws luag nyob rau hauv xws li ib tug complex tswvyim. Qhov no yog vim li cas lo ntsiab muag nrog ib taag focal ntev, muab ib daim duab zoo thiab yog feem ntau npaum li cas kim kim tshaj cov "Zuma".

Nws muaj lwm yam aberrations ntawm optical systems. Thaum siv ib kheej kheej lens muaj kheej kheej aberration vim qhov txawv nyob rau hauv lub tsev ntawm lub illumination nyob rau hauv nruab nrab thiab nyob rau hauv sawv ntawm lub lens. Qhia los ntawm cov kho raws nyob rau hauv lub lubrication lawv halo. Yuav kom ua duab smearing thiab aberrations xws li coma thiab astigmatism. Lwm ntau defect, tshwj xeeb tshaj yog cov yam ntxwv ntawm lub dav-kaum sab xis thiab telephoto lo ntsiab muag - kho qhov muag distortion uas tshuam exaggerates cov kev xav ntawm tus ncej tob. Nws yog qhia nyob rau hauv lub curvature ntawm cov kab ncaj nraim thiab tej zaum yuav convex thiab concave.

Feem ntau cov aberrations tam sim no yog tsis yooj yim rau kev txhim kho nyob rau hauv lub graphic editors. Tab sis tej zaum, tshwj xeeb tshaj yog paub txog nws cov technology, nws yog yooj yim los mus xav txog lawv thaum shooting thiab tejzaum nws tsis txhob phem lub koob yees duab angle.