Raster graphics yog txoj kev ntawm kev hais tawm ib cov duab raws li cov duab plaub sib npaug. Txhua lub xov tooj ntawm cov lej sib npaug yog xim teev. Lub caij ntawm xws li daim phiaj hu ua pixel.
Cov Lus Qhia
Kauj ruam 1
Thaj chaw tseem ceeb ntawm kev thov ntawm raster duab yog lub digitization ntawm cov duab. Txhua lub khoos phis tawj tau txais los siv cov duab vector lossis raster. Cov duab niaj hnub thiab kab ke duab tam sim tsim cov duab ntawm raster duab.
Kauj ruam 2
Cov ntaub ntawv duab muaj cov yam ntxwv nram qab no: tus lej ntawm pixels, xim qhov tob (tus naj npawb ntawm cov xim), qhov chaw xim thiab kev daws teeb meem.
Kauj ruam 3
Muaj ib qho teeb meem loj nrog kev siv cov thev naus laus zis no. Bitmap cov duab yog loj txaus. Yuav kom daws tau qhov teeb meem no, lawv tau los nrog cov qauv tshwj xeeb ntawm kev siv cov ntawv no. Txhua cov ntaub ntawv tau tom qab nias tau muab faib ua ob hom. Thawj suav nrog cov duab uas tsis tau poob lawv qhov zoo tom qab zaws. Qhov zoo ntawm cov ntaub ntawv ntawm lub hom ob yog qhov txawv ntawm tus thawj version.
Kauj ruam 4
Qhov siab tshaj plaws duab zoo yog qhov xam qhov PNG. Cov ntaub ntawv ntawm hom no tuaj yeem muaj txog 48 kab lus ntawm cov ntaub ntawv ib pixel. Cov duab khaws tseg hauv.
Kauj ruam 5
Feem ntau cov ntaub ntawv lossless compression cov hom ntawv yog BMP. Tshaj 16 lab xim sib txawv tuaj yeem siv thaum ua kom pom BMP cov duab. Txhua tus pixel nqa tau 24 kab ntawv ntawm cov ntaub ntawv.
Kauj Ruam 6
Kuj tseem muaj hom ntawv.
Kauj Ruam 7
Cov ntaub ntawv feem ntau ntsib yog hom JPEG. Nws tau tsim los ntawm C-lub voos xwmfab Microsystems. Lub hom phiaj tseem ceeb ntawm nws siv yog khaws cov duab nrog qhov tob xim tob. Cov duab JPEG coj los siv tsawg qhov chaw ntawm cov ntaub ntawv khaws cia, uas tau ua nws nrov heev.
