LUTs: Dab tsi yog Qhov Kev Ntsuas Xim Xim?

by kim Kho tshiab: Lub rau hli ntuj 27, 2022

Saib Tables (LUTs) yog cov cuab yeej muaj zog hauv xim muab qhab nia thiab video post-ntau lawm. Lawv tso cai rau koj tsim cov duab tshwj xeeb thiab zoo nkauj pom sai thiab yooj yim, yog li koj tuaj yeem ua rau koj cov neeg tuaj saib xav tsis thoob nrog qhov ua haujlwm zoo kawg nkaus.

Hauv tsab xov xwm no, peb yuav tshawb txog cov hauv paus ntawm LUTs, lawv ua haujlwm li cas, lawv tuaj yeem ua rau koj li cas, thiab koj tuaj yeem ua tau zoo tshaj plaws ntawm lawv hauv koj tus kheej cov haujlwm.

• Tsim ntawm LUTs
• Yuav ua li cas LUTs ua hauj lwm
• Yuav ua li cas LUTs tuaj yeem ua rau koj
• Ua qhov feem ntau ntawm LUTs hauv koj qhov project

Kev txhais ntawm LUTs

Saib-up tables (LUTs) yog cov cuab yeej tseem ceeb rau kev muab cov xim xim thiab ua cov duab. A LUT yog qhov tseem ceeb ntawm cov ntaub ntawv uas muab cov lus qhia xim tshwj xeeb rau cov zis video lossis kho cov tshuab. Cov txheej txheem ntawm kev siv LUT hu ua "3D LUV” uas stands rau peb-dimensional lookup rooj. Nws tso cai rau cov duab lossis yees duab los hloov kho hauv tonality, sib piv, saturation, ntawm ntau lwm yam tsis muaj nyob rau hauv thiaj li yuav phim ib tug tej yam saib los yog qib.

3D LUT yog ib feem tseem ceeb ntawm cov video editing txheej txheem, tshwj xeeb tshaj yog thaum kev kho xim thiab precision hla ntau cov lus xav tau. Nyob rau sab saum toj ntawm qhov no, nws tuaj yeem hloov maj mam hloov mus rau tag nrho cov kev xav ntawm cov duab thaum khaws nws cov yam ntxwv qub - ua rau nws yog lub cuab yeej zoo tshaj plaws rau kev tsim cov yeeb yaj kiab stylized zoo li qib siab thiab raug. Feem ntau, muaj ob hom kev siv uas 3D Luts tau ua tiav siv - tso tawm ntau lawm thiab kev tshaj tawm xov xwm.

Hauv kev tsim khoom tom qab, Luts tuaj yeem siv los sib npaug ntawm cov xim nrog rau cov xim zoo nkauj ntawm cov tawv nqaij thiab lub teeb pom kev zoo ntawm kev txhaj tshuaj sai thiab raug. Txoj kev no cov neeg tsim yeeb yaj kiab tuaj yeem ua tiav cov txiaj ntsig zoo sib xws thoob plaws cov yeeb yaj kiab sib txawv nrog ib tus qauv siv rau txhua qhov xwm txheej tsis hais ib puag ncig lossis cov cuab yeej siv. Ntxiv mus, cov neeg tsim yeeb yaj kiab tuaj yeem tsim cov cwj mem kos duab tshwj xeeb yam tsis muaj kev siv zog ntau dhau los ntawm kev sib txuas ua ntej tsim 3D lut pleev teeb nrog cov tswv yim ua haujlwm xws li vignettes thiab xim hloov pauv siv rau lawv.

Kev tshaj tawm xov xwm siv ntau hom tsis yog cov yeeb yaj kiab nkaus xwb tab sis kev lag luam ib yam nkaus - qhov twg muaj kev tswj xyuas ntau dua cov xim yuav zoo dua los ntawm kev pom zoo ib yam li ntawm qhov zoo nkauj. Ntawm no 3dLuts ua rau nws ua tau rau cov neeg tsim khoom los xyuas kom meej cov xim xim ntawm txhua qhov kev txhaj tshuaj-zoo li daim tawv nqaij xim thiab lwm yam, kom ntseeg tau tias txhua qhov kev tshaj tawm cov ntsiab lus ua raws li cov qauv kev lag luam kom cov neeg saib pom tsuas yog cov calibrated dluab ntawm cov ntxaij vab tshaus sib txawv hauv lawv cov khoom siv nrog software nyiam. DaVinci daws 15 lwm.:

• Tshaj Lawm Ntau Lawm
• Kev Tshaj Tawm Tshaj Tawm
• DaVinci daws 15

LUTs ua haujlwm li cas

Saib Tables (LUTs) yog ib qho cuab yeej pab tau zoo heev uas siv rau hauv kev muab xim xim. Lawv pab standardize cov xim sib txawv kom cov tswv yim meej uas koj tau muab tso rau hauv qhov system yog dab tsi los ntawm sab nraud. LUTs yog siv nyob rau hauv ntau qhov sib txawv workflows thiab daim ntaub ntawv, los ntawm virtual ntau lawm mus rau xim grading tom qab ntau lawm workflows.

Hauv seem no, peb yuav tshawb xyuas seb yuav ua li cas LUTs ua hauj lwm thiab yuav ua li cas lawv yuav siv tau los xyuas kom meej qhov sib xws ntawm cov xim grading:

1. Yuav ua li cas LUTs yog siv rau hauv kev ua haujlwm tom qab kev tsim khoom
2. Yuav ua li cas mus thov LUTs nyob rau hauv cov xim grading
3. Yuav tsim li cas LUTs rau tej yaam num colour grading

Nkag siab txog Xim Chaw

Yuav kom nkag siab dab tsi a Saib Table (LUT) yog thiab yuav ua li cas nws ua haujlwm, nws yog ib qho tseem ceeb ua ntej kom muaj kev nkag siab yooj yim ntawm cov xim qhov chaw. Peb qhov loj me ntawm qhov chaw xim yog Hawj txawm, Ntxoov Yeeb thiab luminance. Hue yog hais txog qhov nam ntawm cov xim uas qhia nws cov xim lossis ntxoov ntxoo xws li liab, xiav lossis ntsuab. Saturation yog hais txog qhov hnyav npaum li cas lossis vivid ib xim thaum lub teeb pom kev zoo li cas lub teeb ci tshwm ntawm peb cov zaub.

Hauv cov duab digital, txhua pixel muaj cov ntaub ntawv hais txog nws Hawj txawm, Ntxoov Yeeb thiab luminance tus nqi. Cov ntaub ntawv no yog siv los ntawm cov kev pabcuam video kho kom pom cov xim raug rau ntawm lub monitor lossis TV. LUTs muaj peev xwm hloov kho cov ntaub ntawv no txhawm rau hloov qee yam ntawm cov duab tag nrho saib - feem ntau yog los ntawm kev kho ib lossis ntau dua ntawm peb qhov ntev hauv qhov chaw xim (Hawj txawm, Ntxoov Yeeb thiab luminance).

A LUT tuaj yeem siv rau ntau lub hom phiaj - los ntawm kev hloov cov duab tag nrho qhov sib txawv theem thiab saturation mus rau kev hloov maj mam los yog kev hloov pauv hauv cov suab nrov tshwj xeeb hauv cov duab txhawm rau tsim kom zoo nkauj zoo nkauj. Piv txwv li, thaum siv kom raug, LUTs ua rau cov tawv nqaij tones zoo li softer thaum nce qhov sib txawv ntawm cov xim sib txawv thiab saturations - muab cov khoom kawg rau kev xav txawv kiag li thaum koj pib nrog koj cov duab tiaj tus.

Nkag siab txog Xim Gamut

Xim gamut (tseem hu ua qhov chaw parameter) qhov tseem ceeb yog hais txog ntau yam xim uas tuaj yeem tsim nyob rau hauv cov ntsiab lus tshwj xeeb, xws li video lossis luam tawm.

Saib Tables (LUTs) yog siv nyob rau hauv cov xim grading tso cai rau tus neeg siv kom meej sawv cev rau lub teeb spectrums thiab tso zis tib yam saib nyob rau hauv lwm yam tshaj cov zaub los yog projection systems.

Hauv qhov tseem ceeb, Look Up Table (LUT) yog kev hloov pauv lej khaws cia ua cov lej ntawm cov lej. Nws feem ntau hu ua 'colour grading', '3D LUTs' lossis 'cube LUTs'. Thaum cov xim muab qhab nia nrog LUTs, cov neeg kho thiab cov kws tshaj lij khaws cia ob qho tib si lawv cov tswv yim thiab cov txiaj ntsig, tso cai rau lawv los tsim cov duab uas zoo ib yam tsis hais seb lawv ua haujlwm nrog analog lossis digital footage, hauv Final Cut Pro X, Adobe Premier los yog DaVinci Resolve.

LUT-raws li kev ua haujlwm ua haujlwm ua haujlwm sai dua, raug thiab ua haujlwm tau zoo dua. Nrog rau kev ua haujlwm ntawm cov xim xim ib txwm muaj, koj yuav tsum kho txhua tus nqi xim sib cais yam tsis muaj qhov tseeb. Nrog LUT-raws li kev ua haujlwm, nws yooj yim rau cov neeg kho thiab cov kws tshaj lij zoo ib yam los siv cov xim sib xws ntawm ntau qhov kev txhaj tshuaj sai thiab ua tau zoo.

Yuav kom cov txheej txheem no coj qhov chaw zoo nws xav kom txhua yam khoom siv siv tib xim qauv - feem ntau Cov ntaub ntawv 709 tab sis kuj DCI-P3 rau qee hom koob yees duab digital - thaum khaws cov ntaub ntawv hais txog qhov chaw xim kom xim ntawm ib lub cuab yeej tuaj yeem raug txav mus rau lwm qhov yam tsis muaj qhov yuam kev tshwm sim hauv kev hloov pauv.

Hom ntawm LUTs

LUTs (Saib Tables) yog siv nyob rau hauv cov xim grading rau manipulate thiab txhim khu video footage. Txhawm rau ua tiav qhov no, LUTs hloov cov txiaj ntsig tshwj xeeb ntawm cov xim thiab luminosity hauv daim duab los tsim cov txiaj ntsig xav tau. Muaj ntau hom LUTs tsim los rau ntau hom kev kho xim. Cia peb saib ob peb yam sib txawv ntawm LUTs thiab lawv siv:

• Nkag mus rau Linear - Hom LUT no yog siv los hloov logarithmic footage rau qhov chaw xim kab. Qhov no feem ntau yog siv rau cov ntawv teev lus los ntawm cov koob yees duab digital.
• Creative - Creative LUTs yog siv los txhim kho qhov zoo thiab kev xav ntawm cov duab los ntawm kev hloov xim thiab qhov sib txawv. Nws tuaj yeem ntxiv kev xav cinematic rau footage.
• Cov ntaub ntawv 709 - Rec709 LUTs yog siv los hloov cov duab mus rau Rec709 xim chaw. Qhov no yog siv thaum cov duab xav kom phim qhov chaw xim ntawm tus saib video.
• calibration - Calibration LUTs yog siv los ntsuas cov duab rau qhov chaw xim tshwj xeeb. Qhov no yog siv los ua kom tiav ib qho zoo sib xws ntawm ntau hom duab.

Log LUTs

Log LUTs yog cov duab saib xim uas tso cai rau cov yees duab thiab cov duab kho kom haum cov duab los ntawm ntau lub koob yees duab. Qhov no ua kom cov xim raug thiab sib xws ntawm cov koob yees duab nrog cov xim sib txawv lossis cov txheej txheem. Log LUTs kuj tseem siv los tsim cov xim toning, feem ntau nrog cov yeeb yaj kiab zoo.

Thaum siv cov log LUTs, nws yog ib qho tseem ceeb uas yuav tsum siv lawv kom raug, vim lawv yuav tsis "kho" cov teeb meem ntawm cov duab tsis zoo. Log-LUTs feem ntau yog siv thaum kawg ntawm cov txheej txheem kho kom paub meej qhov tseeb tshaj plaws.

Hom log LUTs:

• Standard Log: Tus qauv log LUT yog siv los ua kom haum rau xaiv lub koob yees duab hom / profiles thiab transformor exposures rau hauv ib hom ntawv. Qhov no tso cai rau ntau lub koob yees duab duab kom pom zoo ib yam hauv kev txhawb nqa ntawm kev sib koom ua ke zaum kawg. Lub hom phiaj yog ua tiav 'ib qho saib' hla cov duab, tsis hais nws lub koob yees duab keeb kwm lossis hom processor (ie, Blackmagic vs RED).
• Creative Log: Creative log LUTS tsom rau kev muab cov teebmeem tshwj xeeb thaum siv rau video / duab footages xws li cov duab zoo sib xws thiab tshem tawm gradient zoo li tsim los ntawm ib qho chaw kaw / lub koob yees duab. Nws tuaj yeem tsim qhov zoo tshaj plaws uas siv rau kev kos duab lossis kev hloov ntawm tag nrho cov kev xav rau qee qhov clips uas sawv tawm ntawm qhov seem ntawm koj qhov project raws li kev xav lossis kev xav - xws li tsim lub 'glowy' zoo li nrov los ntawm series xws li Stranger Things, Westworld thiab lwm yam science ntawv tseeb / fantasy qhia.

Creative LUTs

Creative LUTs yog siv los ntxiv tonal hloov thiab stylized zoo rau cov duab. Lawv tuaj yeem tswj cov xim xaum xim hauv ntau txoj hauv kev, xws li exaggerating tej tones los yog saturating tej yam ntawm cov duab. Creative LUT tuaj yeem siv los ua kom tiav cov qauv vintage, cov teebmeem yeeb yaj kiab analog lossis hloov pauv xim dub thiab dawb. Ntau hom Creative LUTs suav nrog:

• Hla Processing LUTs: Cov LUTs rov ua cov txheej txheem tsaus nti ntawm kev ua yeeb yaj kiab uas tsis raug siv los tsim cov yeeb yaj kiab uas ua rau cov xim tsis zoo thiab txawv txawv.
• Fashion/Beauty LUTs: Cov LUTs no yog tsim tshwj xeeb rau cov tawv nqaij tones thiab zam kev txhaj tshuaj, softening tawv tawv tones kom ntseeg tau ib tug zoo sib xws nyob rau hauv tag nrho cov xov xwm platforms, los ntawm luam mus rau lub web & tsab ntawv tsa suab hom ntawv.
• Split Tone & Duotone LUTs: Cov cuab yeej muab qhab nia muaj tswv yim no tso cai rau koj siv ob txoj kev kho xim sib txawv ntawm cov qib sib txawv hauv cov duab rau qhov siab tshaj plaws thiab kev tswj xyuas kom meej.
• Darkroom Emulation LUTs: Nrog rau cov no, koj tuaj yeem ua raws li cov yeeb yaj kiab nrov emulsions xws li Dub & Dawb los ntawm kev faib cov duab toning thiab txhim kho cov ntsiab lus nrog midtone curves lossis diffused zoo li.
• Vintage Lookup Tables (LUT): Recreating lub classic icon saib nrog qhov tseeb vintage xav tsis tau yooj yim dua siv ib qho ntawm cov retro tshwm sim Vintage Lookup Tables (LUT).

Technical LUTs

Technical LUTs mus dhau xim grading thiab normalization. Cov hom LUTs tshwj xeeb yog tsim los kom muaj kev cuam tshuam tshwj xeeb rau cov Dub, Dawb, Ntsej Muag lossis Gamma. Cov LUTs no tuaj yeem siv los kho cov teeb meem thaum lub sijhawm tsim khoom, xws li xim tsis sib haum ntawm cov koob yees duab sib txawv lossis qhov chaw ntawm lub teeb.

Piv txwv, a technical UAS tuaj yeem siv los sib sau ua ke dub thiab dawb hla ob lub koob yees duab sib txawv yog li thaum saib ntawm tib lub saib, lawv saib zoo ib yam thiab zoo ib yam ntawm cov suab nrov.

Technical LUTs kuj tseem siv tau rau cov teebmeem tshwj xeeb xws li:

• Kev ntsuas cua sov los ntawm kev hloov cov xim hla cov duab ntxoov ntxoo uas tsim cov nyhuv surreal.

Cov txiaj ntsig ntawm Kev Siv LUTs

LUTs (Saib Tables) yog cov cuab yeej tseem ceeb rau kev muab qhab nia xim hauv kev ua yeeb yaj kiab thiab kev ua yeeb yaj kiab thiab kev ua yeeb yaj kiab. Lawv muab txoj hauv kev sai, ua tau zoo, thiab ncaj qha los thov thiab tswj kev kho xim rau koj qhov project, pab koj ua tiav qhov xav tau thiab xav sai.

Hauv seem no, peb yuav saib cov txiaj ntsig ntawm kev siv LUTs thiab vim li cas lawv tseem ceeb heev hauv cov txheej txheem muab qhab nia xim:

• Kev kho xim sai thiab ua tau zoo
• Cov xim sib xws ntawm ntau qhov kev txhaj tshuaj
• Yooj yim kho thiab kho
• Yooj yim rau siv rau tej yaam num loj

efficiency

Lookup tables (LUTs) muab cov xim muaj tswv yim uas muaj txiaj ntsig, meej thiab txhim khu kev qha rau qib ib qho chaw lossis txhaj tshuaj. Lawv muaj txiaj ntsig zoo hauv kev pab tswj kom muaj xim zoo ib yam ntawm ob qhov kev txhaj tshuaj lossis scenes, txawm tias lawv raug tua ntawm ntau lub koob yees duab. Los ntawm kev siv LUT ua ntej, koj tuaj yeem pib sai sai nrog koj qib tag nrho thiab tom qab ntawd hloov nws ntxiv raws li qhov tsim nyog.

LUTs kuj pab txo cov sij hawm siv ntawm ib qhov project yam tsis muaj kev cuam tshuam ib qho ntawm nws qhov zoo los ntawm kev tso cai rau cov xim pleev xim rau ntau qhov kev txhaj tshuaj ib zaug es tsis txhob ntawm tus kheej. Lawv muab kev tswj siab tshaj plaws ntawm qhov kawg saib thiab lub suab ntawm tag nrho cov kab ke kom txhua tus ncej zoo ib yam thiab zoo nkauj txaus nyiam. Tsis tas li ntawd, LUTs tuaj yeem muab cov kev hloov pauv hloov pauv thoob plaws hauv kev txhaj tshuaj los ntawm kev ntxiv me me ntawm qhov sib piv, saturation, lossis ci ntsa iab qhov tsim nyog, uas yuav tsis tuaj yeem ua tau thaum kho tus kheej thav ntawv manually.

• Qhov zoo ntawm kev siv LUTs:
  • Pib sai sai nrog koj qib tag nrho
  • Txo lub sij hawm siv rau ib qhov project
  • Kev tswj siab tshaj plaws ntawm qhov kawg saib thiab lub suab ntawm tag nrho ib ntus
  • Hloov maj mam txhim kho txhua qhov kev txhaj tshuaj
  • Saib tej yam ntuj tso vim cov xim grading yog raws li complex lej
  • Pab kho cov teeb meem xws li cov xim cam tsis tas yuav kho ntau yam tsis tau ib zaug

Zoo sib xws

Thaum siv Look Up Tables (LUTs) rau kev muab xim xim, lub sijhawm tsim nyog rau kev hloov pauv rau tag nrho cov haujlwm tau txo qis heev. Qhov no yuav ua rau muaj kev ua haujlwm nrawm dua, tsis muaj qhov tsis zoo.

Tsis tas li ntawd, thaum koj qib ib daim duab lossis ib ntu ntawm cov duab tsis tu ncua nrog LUTs, koj yuav tuaj yeem xyuas kom meej tias txhua qhov kev hloov pauv uas koj tau ua thoob plaws ib qhov haujlwm tseem nyob ib puag ncig. Qhov no tso cai rau koj los lav qhov siab ntawm qhov sib xws thiab qhov tseeb ntawm txhua tus neeg txhaj tshuaj thiab pab tswj xyuas qhov zoo thiab hnov ​​​​zoo thoob plaws txhua daim duab, tsis txhob muaj nws thoob plaws qhov chaw. Kev sib raug zoo thaum muab cov xim xim tseem ceeb hauv kev xa xov zoo thiab qhia koj zaj dab neeg kom raug.

Zoo

Ib qho txiaj ntsig zoo tshaj ntawm kev siv Saib Tables (LUTs) thaum cov xim grading yog qhov zoo dua ntawm cov duab. Pib nrog, LUTs yog qhov tseeb dua piv rau lwm txoj hauv kev vim tias lawv yooj yim rau tag nrho cov txheej txheem los ntawm kev tsom mus rau kev kawm ua ntej kev kawm thiab lej. Nrog lub khoos phis tawj algorithms thiab tsis siv neeg ua haujlwm raws li cov qauv tshwj xeeb thiab cov qauv xim, cov neeg siv tuaj yeem tau txais txiaj ntsig los ntawm cov xim zoo nkauj uas ua rau muaj txiaj ntsig zoo ib yam. Qhov no yuav pab kom muaj kev ua tau zoo nyob rau hauv txhua txoj haujlwm-tshwj xeeb vim tias muaj chav tsawg dua rau kev ua yuam kev xws li tsis sib haum ntawm cov tawv nqaij tones lossis xim tsis raug hauv qee qhov xwm txheej.

Lwm qhov ntawm qhov zoo muaj feem xyuam rau qhov ceev thiab kev ua haujlwm nrog LUTs. Piv rau phau ntawv txoj kev xws li curves or zawv zawg uas yuav tsum tau siv sijhawm ntau los txiav txim siab cov ntsiab lus, theem, ntsuas ntsuas thiab lwm yam ntsig txog txhua qhov kev txhaj tshuaj (siv cov peev txheej muaj txiaj ntsig), siv LUTs muab cov neeg siv qhov nrawm uas pab txo cov nqi los ntawm kev txiav cov sijhawm ua haujlwm uas yuav tsum tau ua nyob rau hauv cov haujlwm. Tsis tas li ntawd, automated functions zoo li no muab cov neeg siv nrog cov txiaj ntsig raug nyob rau lub sijhawm tsawg dua -zoo heev rau kev tua ntawm lub sijhawm nruj los yog tsuas yog xyuas kom meej tias cov hnub kawg tau ntsib sai thiab ua tau zoo.

xaus

Hauv kev xaus, LUTs yog cov cuab yeej tseem ceeb rau cov neeg pleev xim tsim kom muaj xim sib npaug sib npaug ntawm cov haujlwm thiab cov koob yees duab. Nrog lub peev xwm los phim xim los ntawm gamut daim ntawv qhia thiab HDR, LUTs muab cov txiaj ntsig txhim khu kev qha sai. Los ntawm kev siv lawv cov cuab yeej muaj zog thiab ua tau zoo, txhua yam kev ua haujlwm tau qhib nrog cov xim nplua nuj thiab cov xim raug xim. Nrog rau txoj kev paub zoo, colorists 'pom zoo qhia tau ntau dua robust dua li ua ntej.

Nyob zoo, Kuv yog Kim, niam thiab ib tus neeg nyiam nres nrog keeb kwm yav dhau los hauv kev tshaj tawm thiab kev txhim kho lub vev xaib. Kuv muaj kev mob siab rau kev kos duab thiab kev ua yeeb yam, thiab tam sim no kuv tab tom dhia taub hau ua ntej mus rau hauv lub ntiaj teb nres. Nrog rau kuv qhov blog, Kuv tabtom qhia kuv cov kev kawm nrog koj.