Alpha channel piav qhia ua lus Askiv
Ib qho alpha channel yog ib feem ntawm cov duab uas khaws ** pom tau li cas txhua pixel yuav tsum yog **. Xim raws piav qhia liab, ntsuab, thiab xiav. Alpha piav txog opacity.
Yog tias koj tshem tawm keeb kwm yav dhau los thiab xa tawm PNG pob tshab, koj tsis yog rho tawm xim xwb. Koj tab tom sau alpha qhov tseem ceeb uas hais tias: khaws lub pixel no, ploj ntawm ntug no, lossis ua rau thaj chaw no pom tsis meej.
Tias yog vim li cas pob tshab cutouts tuaj yeem saib ntuj thaum cov npoo muag muag zoo - thiab yog vim li cas cov khoom xa tawm tsis zoo saib tsis ncaj ncees txawm tias qhov kev kawm nws tus kheej yog ntse.
Tus qauv yooj yim
Rau txhua pixel, alpha teb ib lo lus nug:
- tag nrho opaque: cov ntsiab lus qhia kiag li
- pob tshab tag nrho: tsis muaj dab tsi los ntawm qhov pixel ntawd
- ib nrab pob tshab: lub pixel sib xyaw nrog txhua yam nyob tom qab nws
Ib nrab pob tshab yog cov tswv yim vim li cas cov plaub hau, plaub, thiab mos contours tuaj yeem zoo li kev ntseeg tsis txhob txiav nrog txiab.
Vim li cas qhov no tseem ceeb rau kev tshem tawm keeb kwm yav dhau
Kev tshem tawm keeb kwm yav dhau tsis yog “rho tawm cov keeb kwm yav dhau.” Ib qho txiaj ntsig zoo kuj xav tau ib thaj tsam uas coj zoo thaum cov duab tso rau lwm qhov.
Alpha yog qhov ua rau cov txiaj ntsig no ua tau:
- cov ntsiab lus ntab hla ib qho xim tshiab
- Cov npoo muag sib xyaw tsis yog saib stamped
- checkerboard saib ua ntej tuaj yeem pom thaj chaw khoob
Yog tsis muaj alpha, “tshem tawm keeb kwm yav dhau” feem ntau dhau los ua lub phaj dawb lossis lwm cov khoom ntim.
Cov ntug mos vs tawv ntug
Cov npoo tawv yog feem ntau opaque-lossis-pob qhov kev txiav txim siab. Cov npoo mos siv sib xyaw.
Qhov kev sib xyaw no muaj txiaj ntsig zoo rau:
- plaub hau strands
- plaub
- semi-pob tshab yas
- motion-blurred contours
Nws kuj yog qhov teeb meem tshwm sim. Yog hais tias alpha yog abrupt heev, cov ntsiab lus zoo li txiav tawm. Yog tias alpha ntxhov siab, koj tau txais fringe thiab halo.
Dab tsi alpha tsis yog
Alpha tsis yog:
- ib tug dawb tom qab
- tus qauv checkerboard nws tus kheej
- ib tug guarantee ntawm zoo meej ntug zoo
Checkerboard tsuas yog ib qho kev pom ua ntej. Dawb tseem yog xim. Alpha yog cov ntaub ntawv pom kev.
piv txwv
Xav txog tej yam khoom txiav tawm muab tso rau ntawm ib qho tsaus nti banner:
- zoo alpha: cov ntsiab lus zaum huv si tsis muaj xim daj
- tsis muaj zog alpha: faint dawb los yog xim fringe tseem nyob ib ncig ntawm lub contour
Lub fringe feem ntau yog tus cwj pwm sab laug, tsis yog qhov tsis paub “PNG kab.”
Yuav ua li cas qhov no txuas rau Easy Background Remover
Hauv qhov haujlwm no:
- Qhib cov duab uas txhawb nqa
- Tshem tawm cov keeb kwm yav dhau hauv zos
- Kho cov npoo yog xav tau
- Export PNG thiaj li pob tshab (alpha) yog khaws cia
Koj tsis tas yuav tswj hwm alpha raws manually zoo li nyob rau hauv tag nrho cov duab suite. Koj yuav tsum nkag siab tias yog vim li cas export hom thiab ntug ntxuav qhov teeb meem.
Kev ua yuam kev
yuam kev 1: kho alpha raws li kev xaiv jargon
Yog tias koj xav tau rov siv dua hauv keeb kwm yav dhau, alpha yog tag nrho cov ntsiab lus.
Yuam Kev 2: tsis meej pem cov ntug muag nrog cov khoom seem rov qab
Qee qhov softness yog qhov zoo. Pom qub-tom qab xim tsis yog.
yuam kev 3: rov khaws cia rau hauv ib hom ntawv uas poob pob tshab
Yog tias alpha ploj lawm, qhov kev txiav tawm yuav tsis hloov pauv.
yuam kev 4: thuam lub tswvyim es tsis txhob ntawm ntug
Cov ntaub ntawv pob tshab tseem tuaj yeem saib tsis zoo yog tias lub npog ntsej muag ntxhib.
Quick rooj
| Lub sij hawm | Plain meaning | |----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | Alpha | Pom ib pixel li cas | | Pob tshab PNG | Duab uas tuaj yeem khaws thaj chaw khoob ntawm alpha | | Mos ntug | Ib nrab alpha ib ncig ntawm ciam teb | | Halo / fringe | Tsis xav tau ntug xim uas muaj sia nyob txiav tawm |
Rau cov pib tshiab ntawm tib lub tswv yim, saib Dab tsi yog pob tshab PNG?. Txhawm rau ntxuav tom qab txiav tawm, txuas ntxiv nrog Xim nchuav thiab fringing ntawm cutouts.