Isiteshi se-Alpha sichazwe ngesiNgisi esicacile
Isiteshi se-alpha siyingxenye yesithombe esigcina indlela ipixel ngayinye okufanele ibonakale ngayo. Iziteshi ezinemibala zichaza okubomvu, okuluhlaza okotshani, nokuluhlaza okwesibhakabhaka. I-Alpha ichaza ukukhanya.
Uma ususa ingemuva futhi uthumele i-PNG ekhanyelayo, awususi umbala nje. Ubhala amanani e-alpha athi: gcina le pixel, fiphalisa lolu hlangothi, noma wenze le ndawo ingabonakali nhlobo.
Kungakho ama-cutouts abonisa ngale angabukeka engokwemvelo lapho amaphethelo athambile aphethwe kahle - futhi kungani ukuthunyelwa okubi kubukeka kungalungile ngisho noma isihloko ngokwaso sibukhali.
Imodeli elula
Ngephikseli ngayinye, i-alpha iphendula umbuzo owodwa:
- i-opaque ngokugcwele: isihloko sibonisa ngokuphelele
- obala ngokuphelele: akukho lutho oluvela kuleyo pixel esele
- kukhanya ngokwengxenye: i-pixel ihlangana nanoma yini ehlezi ngemuva kwayo
Ukubonakala obala ngokwengxenye kuyisizathu esisebenzayo sokuthi izinwele, uboya, namakhonto athambile angabukeka akholeka esikhundleni sokusikwa ngesikelo.
Kungani lokhu kubalulekile ekususeni ingemuva
Ukususa ingemuva akukhona kuphela “ukususa okwasemuva.” Umphumela omuhle futhi udinga umngcele oziphatha kahle lapho isithombe sibekwe kwenye indawo.
I-Alpha yiyona eyenza le miphumela ibe khona:
- isihloko sintanta phezu kombala omusha
- imiphetho ethambile iyahlangana esikhundleni sokubukeka isigxivizo
- Ukuhlola kuqala kwebhodi lokuhlola kungabonisa izifunda ezingenalutho
Ngaphandle kwe-alpha, “ingemuva elikhishiwe” ngokuvamile liba ipuleti elimhlophe noma okunye ukugcwaliswa okuqinile.
Imiphetho ethambile vs imiphetho eqinile
Imiphetho eqinile ngokuvamile yizinqumo ezifiphele noma ezingacacile. Imiphetho ethambile isebenzisa imiksi.
Leyo miksi iwusizo ku-:
- izintambo zezinwele
- uboya
- amapulasitiki angafihli lutho
- amakhonsathi afiphele ukunyakaza
Yilapho futhi kuvela khona izinkinga. Uma i-alpha inesiqubulo kakhulu, isihloko sibukeka sisikiwe. Uma i-alpha ingcolile, uthola i-fringe ne-halo.
Okungeyona i-alpha
I-Alpha ayiyona:
- ingemuva elimhlophe
- iphethini yokuhlola ngokwayo
- isiqinisekiso sekhwalithi yomkhawulo ophelele
I-Checkerboard iyingqungquthela yokubuka kuqala kuphela. Okumhlophe kusewumbala. I-Alpha idatha yokubonakala.
Isibonelo esisebenzayo
Cabanga ngokusikwa komkhiqizo obekwe kusibhengezo esimnyama:
- i-alpha enhle: isihloko sihlezi ngokuhlanzekile ngaphandle kwerimu eliphaphathekile
- i-alpha ebuthakathaka: umphetho omhlophe noma onemibala uhlala uzungeze umkhonto
Umphetho uvame ukusala, hhayi “i-PNG bug” engaqondakali.
Lokhu kuxhuma kanjani ku-Easy Background Remover
Kulolu hlelo lokusebenza:
- Vula isithombe somthombo esisekelwayo
- Susa ingemuva endaweni yangakini
- Hlunga imiphetho uma kudingeka
- Thekelisa i-PNG ukuze kugcinwe obala (i-alpha)
Awudingi ukuphatha iziteshi ze-alpha mathupha njengakuhlelo olugcwele lwezithombe. Udinga ukuqonda ukuthi kungani ifomethi yokuthekelisa kanye nokuhlanza umphetho kubalulekile.
Amaphutha ajwayelekile
Iphutha 1: ukuphatha i-alpha njengejagoni ozikhethela yona
Uma udinga ukusetshenziswa kabusha kuzo zonke izizinda, i-alpha iyona phuzu.
Iphutha 2: unqenqema oluthambile oludidayo nengemuva elisele
Okunye ukuthamba kuhle. Umbala wengemuva elidala obonakalayo awuwona.
Iphutha lesi-3: ukulondoloza kabusha kube yifomethi eyehlisa ukubonakala
Uma i-alpha ilahleka, i-cutout iyayeka ukuguquguquka.
Iphutha lesi-4: ukusola umqondo esikhundleni sonqenqema
Ifayela elibonisa ngale lisengabukeka libi uma imaski ilukhuni.
Ithebula elisheshayo
| Isikhathi | Incazelo ecacile |
|---|---|
| Alpha | Ibonakala kanjani iphikseli |
| I-PNG esobala | Isithombe esingagcina izindawo ezingenalutho nge-alpha |
| Unqenqema oluthambile | I-alpha eyingxenye ezungeze umngcele |
| I-Halo / i-fringe | Umbala wonqenqema ongafuneki osinda ekunqanyulweni |
Ukuze uthole inguqulo yokuqala yombono ofanayo, bona okuthi Iyini i-PNG esobala?. Ukuze uhlanzeke ngemva kokusikwa, qhubeka ngokuthi Ukuchitheka kombala kanye ne-fringing on cutouts.