Tam sim no, nyob rau hauv kev tswj xim technology, lub thiaj li hu ua xim feature txuas qhov chaw siv chromaticity chaw ntawm CIE1976Lab. Cov xim ntawm txhua lub cuab yeej tuaj yeem hloov mus rau qhov chaw no los ua "universal" kev piav qhia, thiab tom qab ntawd cov xim sib piv thiab hloov dua siab tshiab tau ua tiav. Nyob rau hauv lub computer operating system, txoj hauj lwm ntawm kev siv cov xim txuam hloov dua siab tshiab yog ua tiav los ntawm "xim txuam module", uas yog ib qho tseem ceeb heev rau kev ntseeg siab ntawm cov xim hloov thiab xim txuam. Yog li, yuav ua li cas kom ua tiav cov xim hloov hauv qhov chaw xim "universal", ua tiav qhov tsis muaj xim lossis xim tsawg?
Qhov no yuav tsum muaj txhua pawg ntawm cov khoom siv los tsim ib qho profile, uas yog cov ntaub ntawv xim ntawm cov khoom siv.
Peb paub tias ntau yam khoom siv, cov khoom siv, thiab cov txheej txheem muaj cov yam ntxwv sib txawv thaum nthuav tawm thiab xa cov xim. Hauv kev tswj xim, kom nthuav tawm cov xim nthuav tawm ntawm ib lub cuab yeej nrog kev ncaj ncees ntawm lwm lub cuab yeej, peb yuav tsum nkag siab txog cov xim nthuav qhia cov yam ntxwv ntawm cov xim ntawm ntau yam khoom siv.
Txij li thaum lub cuab yeej ywj pheej xim qhov chaw, CIE1976Lab chromaticity qhov chaw, tau raug xaiv, cov yam ntxwv xim ntawm lub cuab yeej yog sawv cev los ntawm kev sib txuas lus ntawm cov cuab yeej piav qhia tus nqi thiab tus nqi chromaticity ntawm "universal" xim qhov chaw, uas yog cov cuab yeej cov ntaub ntawv piav qhia xim. .
1. Ntaus xim feature piav qhia cov ntaub ntawv
Hauv kev tswj xim thev naus laus zis, feem ntau hom ntaus ntawv xim feature piav qhia cov ntaub ntawv yog:
Thawj hom yog cov ntaub ntawv scanner feature, uas muab cov ntawv sau tus qauv los ntawm Kodak, Agfa, thiab Fuji tuam txhab, nrog rau cov ntaub ntawv txheem rau cov ntawv sau no. Cov ntawv sau no tau nkag mus siv lub scanner, thiab qhov sib txawv ntawm cov ntaub ntawv scanned thiab cov ntawv sau tus qauv qhia txog tus yam ntxwv ntawm lub scanner;
Qhov thib ob hom yog cov ntaub ntawv feature ntawm cov zaub, uas muab qee cov software uas tuaj yeem ntsuas cov xim kub ntawm cov zaub, thiab tom qab ntawd tsim cov xim thaiv ntawm qhov screen, uas qhia txog cov yam ntxwv ntawm cov zaub; Hom thib peb yog cov ntaub ntawv feature ntawm lub tshuab luam ntawv, uas kuj muab ib txheej ntawm software. Lub software tsim ib daim duab uas muaj pua pua xim blocks nyob rau hauv lub computer, thiab ces outputs daim duab ntawm cov zis ntaus ntawv. Yog tias nws yog lub tshuab luam ntawv, nws ncaj qha mus kuaj, thiab lub tshuab luam ntawv ua ntej tsim cov yeeb yaj kiab, cov qauv, thiab cov ntawv luam tawm. Kev ntsuas ntawm cov duab tso zis no qhia txog cov ntaub ntawv tshwj xeeb ntawm lub tshuab luam ntawv.
Cov ntaub ntawv tsim tawm, tseem hu ua cov ntaub ntawv xim xim, muaj peb lub ntsiab lus: cov ntaub ntawv header, tag lub rooj, thiab cov ntaub ntawv tag.
·Cov ntaub ntawv header: Nws muaj cov ntaub ntawv yooj yim hais txog cov ntaub ntawv xim, xws li cov ntaub ntawv loj, hom kev tswj xim, version ntawm cov ntaub ntawv hom, hom ntaus ntawv, xim qhov chaw ntawm lub cuab yeej, xim qhov chaw ntawm cov ntaub ntawv feature, operating system, ntaus ntawv tsim , xim kho lub hom phiaj, thawj cov xov xwm, cov ntaub ntawv xim xim, thiab lwm yam. Cov ntaub ntawv header occupies tag nrho ntawm 128 bytes.
· Tag Table: Nws muaj cov ntaub ntawv hais txog lub npe kom muaj nuj nqis, qhov chaw khaws cia, thiab cov ntaub ntawv loj ntawm cov cim npe, tab sis tsis suav nrog cov ntsiab lus tshwj xeeb ntawm cov cim npe. Lub npe kom muaj nuj nqis ntawm cov cim npe occupies 4 bytes, thaum txhua yam khoom hauv lub rooj tag occupies 12 bytes.
·Cov ntaub ntawv cim npe: Nws khaws ntau cov ntaub ntawv xav tau rau kev tswj xim hauv qhov chaw xaiv raws li cov lus qhia hauv cov lus cim, thiab nws txawv nyob ntawm qhov nyuaj ntawm cov ntaub ntawv cim thiab qhov loj ntawm cov ntaub ntawv sau npe.
Rau cov xim tshwj xeeb cov ntaub ntawv ntawm cov khoom siv hauv kev lag luam luam ntawv, cov neeg ua haujlwm ntawm cov duab thiab cov ntaub ntawv ua haujlwm muaj ob txoj hauv kev kom tau txais lawv:
·Thawj txoj hauv kev: Thaum yuav cov khoom siv, cov chaw tsim khoom muab cov profile nrog rau cov khoom siv, uas tuaj yeem ua tau raws li kev tswj hwm xim ntawm cov khoom siv. Thaum txhim kho cov cuab yeej siv software, qhov profile yog loaded rau hauv lub system.
·Qhov thib ob mus kom ze yog siv tshwj xeeb profile tsim software los tsim kom haum xim feature piav cov ntaub ntawv raws li qhov tseeb ntawm cov khoom siv uas twb muaj lawm. Cov ntaub ntawv tsim tawm no feem ntau yog qhov tseeb dua thiab ua raws li tus neeg siv qhov xwm txheej tiag tiag. Vim muaj kev hloov pauv lossis sib txawv hauv lub xeev ntawm cov khoom siv, cov khoom siv, thiab cov txheej txheem dhau sijhawm. Yog li ntawd, nws yog ib qho tsim nyog yuav tau rov ua qhov profile ntawm lub sijhawm tsis tu ncua kom hloov mus rau qhov xwm txheej xim teb thaum lub sijhawm ntawd.
2. Xim kis tau tus mob hauv lub cuab yeej
Tam sim no, cia peb saib yuav ua li cas xim kis tau los ntawm ntau yam khoom siv.
Ua ntej, rau cov ntawv sau nrog cov xim ib txwm, lub tshuab luam ntawv yog siv los luam theej duab thiab sau nws. Vim lub scanner's profile, nws muab kev sib raug zoo ntawm cov xim (xws li liab, ntsuab, thiab xiav tristimulus qhov tseem ceeb) ntawm lub scanner mus rau CIE1976Lab chromaticity qhov chaw. Yog li ntawd, kev khiav hauj lwm qhov system tuaj yeem tau txais tus nqi chromaticity Lab ntawm cov xim qub raws li qhov kev sib raug zoo no.
Cov duab scanned yog tso tawm rau ntawm qhov screen. Txij li thaum lub kaw lus tau paub txog kev sib txuas lus ntawm Lab chromaticity qhov tseem ceeb thiab liab, ntsuab, thiab xiav tsav tsheb teeb liab ntawm cov zaub, nws tsis tas yuav ncaj qha siv cov xim liab, ntsuab, thiab xiav chromaticity qhov tseem ceeb ntawm lub scanner thaum lub sij hawm tso saib. Hloov chaw, los ntawm Lab chromaticity qhov tseem ceeb ntawm cov ntawv sau yav dhau los, raws li kev sib raug zoo hloov dua siab tshiab muab los ntawm cov duab profile, cov zaub tsav tsheb teeb liab liab, ntsuab, thiab xiav uas tuaj yeem ua kom pom cov xim qub ntawm lub vijtsam tau txais, Tsav cov zaub. los tso saib xim. Qhov no ua kom ntseeg tau tias cov xim uas pom ntawm lub monitor sib phim cov xim qub.
Tom qab soj ntsuam cov duab xim xim zoo, tus neeg teb xov tooj tuaj yeem kho cov duab raws li xim xim raws li cov neeg siv khoom xav tau. Tsis tas li ntawd, vim qhov profile uas muaj cov khoom siv luam ntawv, cov xim raug tom qab luam ntawv tuaj yeem pom ntawm cov zaub tom qab cov duab sib cais. Tom qab tus neeg teb xov tooj txaus siab rau cov xim ntawm cov duab, cov duab yog xim sib cais thiab khaws cia. Thaum sib cais xim, qhov feem pua ntawm cov dots tau txais raws li kev sib raug zoo ntawm cov xim hloov los ntawm lub tshuab luam ntawv profile. Tom qab ua tiav RIP (Raster Image Processor), kev sau thiab luam ntawv, luam ntawv, pov thawj, thiab luam ntawv, luam tawm daim ntawv luam ntawm thawj daim ntawv tuaj yeem tau txais, yog li ua tiav tag nrho cov txheej txheem.
Post lub sij hawm: Nov-23-2023
