Umfanekiso we-bitmap (okanye u-raster) ngowomnye weendlela ezimbini eziphambili zodidi (enye ingumvini). Imifanekiso esekelwe kwi-Bitmap iqulethwe ngamaphikseli kwisigridi. I-pixel nganye okanye "bit" kumfanekiso iqulethe ulwazi malunga nombala okumele uboniswe. Imifanekiso yeBitmap inezigqibo ezichanekileyo kwaye ayikwazi ukuhlaziywa ngaphandle kokulahlekelwa ngumgangatho womfanekiso. Nasi isizathu:
I-pixel nganye kwiskrini sakho, ngokwemigqaliselo elula, i "bit" yolwazi lombala osetyenziswayo ukubonisa umfanekiso kwiskrini. Esi sikrini sinokuba sincinci njengelinye kwi-Apple Watch okanye sikhulu njengeBhodi yePixel efumaneka kwi-Times Square.
Kanye kunye nokufuna ukwazi imibala emithathu- I-Red, Green, Blue-esebenzayo kwi-pixel enye "ibin" yolwazi yilapho, ngokuqinisekileyo, loo pixel ifumaneka kumfanekiso.Izi pixel zenziwa xa umfanekiso ufakwa. Ngaloo ndlela ikhamera yakho ithatha umfanekiso kwii-pixels ezili-1280 ngaphaya kunye nee-pixels ezingama-720 ezantsi zi-pixels ezizi-921,600 kumfanekiso kwaye umbala ngamnye wepikelli kunye nendawo kufuneka ikhunjulwe kwaye yenziwe. Ukuba uphindwe kabini ubukhulu bomfanekiso, zonke izinto ezenzekayo iipekseli ziba zikhulu kwaye ubukhulu befayili banda ngenxa yokuba inani elifanayo leepekseli ngoku lihlala kwindawo enkulu. Azikho iipekseli zongezwa. Ukuba unciphisa ubukhulu bomfanekiso inombolo efanayo yamaphikseli akwiindawo ezincinci kwaye, ngoko kunjalo, ubukhulu befayile buyancipha.
Enye enye into echaphazela i-bitmaps yisisombululo. Isisombululo sisigxina xa umfanekiso wenziwa. Uninzi lweekhamera zedijithali zanamhlanje, umzekelo, zithatha imifanekiso nge-300 dpi isombululo. Konke oku kuthetha ukuba kukho iipekseli ezingama-300 kuyo yonke intshi yomgca womfanekiso. Oku kuchaza ukuba kutheni imifanekiso yekhamera yedijithali ingaba yinto enkulu. Kukho iitoni zeepikseli ezinokuba zimephu kunye nembala kunokuba zifunyenwe ngokuqhelekileyo kwikhompyutheni eqhelekileyo.
Iifomati eziqhelekileyo ze-bitmap ziseJPEG, GIF, TIFF, PNG, PICT kunye ne-BMP. Ininzi imifanekiso ye-bitmap ingaguqukela kwezinye iifom-based based formats kakhulu. Iimpawu zeBitmap zinobukhulu obukhulu befayili kuneefayile ezibonakalayo kwaye zihlala zixinzezelwe ukuba zinciphise ubungakanani bazo. Nangona iifom zefayile ezininzi zise-bitmap-based, i-bitmap (BMP) nayo ifomati yezobugcisa nakuba ukusebenzisa kwayo namhlanje kunqabile.
Ukuze ufunde okungakumbi malunga nezinto ezibonakalayo ze-bitmaps, inkcazo epheleleyo yeepikseli kunye nendlela ehambelana ngayo nokuhamba komsebenzi wanamhlanje, unokufuna ukujonga ukuba ufunde kabanzi ngeefomathi ezahlukeneyo ezisetyenziswe ekucingeni ukuba unokufuna ukufunda iphi iifayile zeMpawu Ifomathi Eyona Imigqabileyo Yokusebenzisa Xa?
Ukuhlaziywa nguTom Green.
Iincwadi zeGraphics
Kwaziwa kwakhona njenge: raster
Eminye i-Spellings: imephu ye-BMP