Tus duab bitmap (los yog raster) yog ib qho ntawm ob hom kev nraaj loj loj (lwm qhov yog vector). Bitmap-based dluab yog muaj pixels nyob hauv ib daim phiaj. Txhua pixel lossis "ntsis" hauv daim duab muaj cov ntaub ntawv hais txog cov xim kom pom. Bitmap cov dluab muaj ib qho kev daws teeb meem thiab tsis tuaj yeem ua qauv tsis tau poob duab zoo. Ntawm no yog vim li cas:
Txhua pixel ntawm koj npo yog, cov lus yooj yim heev, "ntsis" ntawm cov ntaub ntawv xim siv los tso saib cov duab ntawm ib qho screen. Tias npo yuav yog me me raws li ib qho ntawm ib qho ntawm Apple Watch lossis loj li Pixel Board pom nyob rau hauv Times Square.
Nrog rau kev xav paub txog peb yam xim- Liab, Ntsuab, Xiav- xaj rau pixel lwm "ntsis" ntawm cov ntaub ntawv yog qhov twg, qhov tseeb, tus pixel nyob rau hauv daim duab.These pixels yog tsim thaum lub duab yog ntes. Li no yog hais tias koj lub koob yees duab captures ib cov duab ntawm 1280 pixels thoob thiab 720 pixels down muaj 921,600 pixels pixels tus duab thiab txhua pixel xim thiab qhov chaw yuav tsum nco ntsoov thiab nws. Yog tias koj muab ob npaug ntawm daim duab, txhua yam uas tshwm sim yog qhov pixels tau loj dua thiab cov ntaub ntawv loj nce vim tias tib pixels muaj tam sim no nyob rau thaj tsam loj. Tsis muaj pixels ntxiv. Yog hais tias koj txo qhov loj ntawm daim duab tib yam pixels nyob rau hauv ib cheeb tsam me me thiab, xws li, cov ntaub ntawv loj thiaj li.
Ib qho tseem ceeb uas cuam tshuam cov bitmaps yog qhov kev daws teeb meem. Qhov kev daws teeb meem yog tas thaum tsim duab. Muaj coob tus niaj hnub nim no cov koob yees duab digital, piv txwv, ntes dluab nrog ib qho kev txiav txim siab 300 dpi. Tag nrho cov txhais tau tias yog muaj 300 plhom tawm hauv txhua kab tawm ntawm cov duab. Qhov no yog vim li cas cov koob yees duab digital yuav ua tsis zoo nkauj. Muaj ntau tshaj ib lub suab pixels yuav tsum muaj mapped thiab dawb lias uas muaj nyob rau ntawm cov khoom siv computer.
Hom ntawv uas muaj ntsis bitmap yog JPEG, GIF, TIFF, PNG, PICT, thiab BMP. Feem ntau cov duab bitmap tuaj yeem hloov dua siab tshiab rau lwm hom ntawv uas yog bitmap yooj yim heev. Bitmap cov dluab yuav muaj ntau ntau qhov ntau thiab tsawg dua vector graphics thiab lawv muaj feem ntau compressed los txo lawv cov me me. Txawm hais tias muaj ntau yam tawm tswv yim duab yog cov bitmap, bitmap (BMP) kuj yog ib daim duab nrawm tab sis nws siv hnub no yog tsawg kawg.
Yog xav paub ntxiv txog cov khoom siv raw ntawm bitmaps, ib qho kev piav qhia ntawm pixels thiab seb lawv haum rau hnub no tus haujlwm ua haujlwm niaj hnub no, koj tuaj yeem xav xyuas seb puas xav paub ntxiv txog cov ntaub ntawv ntau yam hauv kev siv koj kuj xav nyeem Cov Ntaub Ntawv Cov Ntaub Ntawv Hom ntawv yog qhov zoo tshaj plaws thaum twg?
Kho dua los ntawm ntsuab ntsuab.
Graphics Glossary
Kuj Paub Raws li: raster
Lwm Spellings: daim ntawv qhia me ntsis BMP