Thaum kawm cov duab digital, ib lub ncauj lus yog nws hom. Cov no suav nrog cov duab vector thiab bitmap. Cov yam ntxwv ntawm tus tom kawg yog lub qauv pixel.
Dab tsi cov duab hu ua bitmap
Bitmaps yog ua los ntawm cov khoom me me sib txawv hu ua pixels. Cov plaub fab no tau teeb tsa hauv daim phiaj tshwj xeeb duab plaub. Cov yam ntxwv tseem ceeb ntawm bitmap duab yog qhov siab thiab dav hauv pixels thiab bits ib pixel. Tus nqi kawg qhia tias muaj pes tsawg xim sib txawv tuaj yeem nyob hauv ib lub xwmfab zoo li no. Yog tias bitmap raws tus qauv RGB (Liab Ntsuab Xiav), tom qab ntawd txhua lub pixel yuav muaj peb bytes ntawm cov xim tshwj xeeb, thiab txhua tus ntawm bytes yuav siv tus nqi ntawm 0 txog 255. Cov xim kawg.
Qhov zoo ntawm cov duab no yog txiav txim siab los ntawm nws txoj kev daws teeb meem thiab qhov tob xim. Thawj tus yam ntxwv hais txog ntau npaum li cas pixels yog mloog zoo nyob rau hauv cov duab, ntau lawv tus naj npawb, cov duab siab dua. Xim tob qhia txog tus nqi ntawm cov ntaub ntawv uas txhua pixel muaj; tus nqi ntau dua, softer thiab ntau qab ntxiag ntawm cov duab ntawm daim duab. Qhov tsis zoo ntawm cov duab raster yog qhov teev: thaum koj xoom, lub ntsej muag ploj, thiab yog tias qhov kev daws teeb meem tsis loj, ces ib tus neeg pixels yuav tshwm sim.
Cov Ntawv Raster Raster
Cov ntaub ntawv Raster nraaj tuaj yeem muaj qhov sib txawv ntawm cov khoom sib txawv, lawv siv cov ntawv sib txawv thiab cov txheej txheem ua kom zoo dua qub, nyob ntawm qhov xav tau.
Cov bitmap yooj yim hom BMP yog ib txwm nyob rau lub Windows ua haujlwm, tsis ceev cov ntaub ntawv, thiab yog li ntawd feem ntau muaj qhov loj me.
Cov duab
Lub 24-ntsis.jpg
Cov ntaub ntawv.png
TIFF yog cov hom ntawv uas tau siv ua ntej pib tawm ntawm PNG, tab sis vim nws muaj ntau yam kev hloov pauv thiab qhov tsis muaj cov txheej txheem ua haujlwm nkaus xwb, nws cov kev txhawb nqa tau raug txiav tawm. TIFF tuaj yeem zaws cov duab nrog nrog lossis tsis muaj qhov tsis zoo.
