Txawm hais tias koj yog tus tsim lub vev xaib, cov kws kos duab kos duab, lossis txawm tias tus kws ntaus suab paj nruag hauv tshuab hluav taws xob, dithering plays lub luag haujlwm tseem ceeb hauv cov txheej txheem muaj tswv yim. Dithering hauv kev ua cov duab yog cov txheej txheem siv los simulate xim lossis shading. Lub tswv yim tseem ceeb tom qab dithering yog ntxiv suab nrov, lossis ntxiv pixels, rau cov ntaub ntawv digital. Hauv cov duab, dithering ntxiv random qauv ntawm pixels los txhim kho cov duab zoo thaum tsis txhob banding.
kab hauv qab
Feem ntau tsis nco qab, ib qho ntawm cov kev siv ntxov tshaj plaws rau kev sib tw yog nyob rau hauv Ntiaj Teb Tsov Rog II rau kev foob pob thiab kev taug kev. Qhov kev siv ntawd txawv heev los ntawm dithering raws li peb paub niaj hnub no. Siv feem ntau hauv cov ntawv luam tawm rau cov ntawv xov xwm thiab cov phau ntawv comic, dithering tuaj rau hauv nws tus kheej nrog rau qhov tshwm sim ntawm World Wide Web. Ua ntej hauv internet tau dhau los ua cov khoom qab zib qhov muag uas peb paub niaj hnub no, yuav luag txhua qhov chaw yog cov ntawv nyeem. Cov qwj-paced ceev ntawm dial-up tsuas yog tso cai rau cov duab rub tawm ntawm qhov nrawm nrawm nrawm. Txawm li cas los xij, thaum xam tau nthuav dav rau hauv 8-ntsis xim nrog cov saib, cov duab kos thiab dithering tuaj rau pem hauv ntej rau lub vev xaib.
Yuav ua li cas Dithering yav dhau los
Nyob rau hauv nws qhov kev siv yav dhau los hauv ntawv xov xwm, phau ntawv comic, thiab lwm yam kev tshaj tawm luam tawm, dithering yuav raug siv rau cov duab los tsim cov theem ntawm simulated grayscale los ntawm kev tso tawm ntawm cov dots dub. Siv cov txheej txheem dithering yuav muab cov duab du nrog grey ntxoov txawm tias luam ntawv xovxwm tsuas yog txhawb nqa tus cwj mem dub. Cov phau ntawv comic thiab lwm yam xim luam ntawv ua haujlwm zoo ib yam, tab sis simulate ntau cov xim ntawm cov xim ntau dua li cov palette printing presses muaj. Hauv qab no yog ib qho piv txwv ntawm yuav ua li cas luam ntawv xovxwm ua tiav cov duab zoo rau hauv cov duab dithered. Daim ntawv ceeb toom yuav ua li cas koj tseem tuaj yeem pom cov xim sib txawv thiab shading, tab sis cov duab yog ntau pixelated.
Tsis ntev los no, kev sib cav tau dhau los ua neeg nyiam hauv lub vev xaib duab. Txawm hais tias feem ntau ntawm cov pej xeem tau nkag mus rau high-speed internet, tseem muaj feem pua ntawm cov neeg siv internet uas vam khom los ntawm kev hu xov tooj. Siv dithering nyob rau hauv cov duab ua tsis tsuas yog txo cov banding ntawm cov xim thiab shading, uas tsim ib tug smoother tiav cov duab, tab sis nws kuj txo cov ntaub ntawv loj. Thawj daim duab yog ib daim duab banded. Koj tuaj yeem pom cov kev hloov pauv hauv cov xim kom meej.
Daim duab thib ob yog tus gradient du qhov twg dithering tau siv. Lub banding tsis pom lawm thiab ua rau cov duab smoother.
Ib qho tseem ceeb siv rau dithering yog kom tsis txhob muaj cov xim los yog ntxoov ntxoo gradient. Los ntawm kev sib xyaw xim los ntawm cov palette txwv kom simulate cov xim qub, koj tau txo cov ntaub ntawv yog li tsim cov ntaub ntawv uas tuaj yeem rub tawm sai dua rau koj lub vijtsam thiab lub computer.gifs yog ib qho piv txwv zoo tshaj plaws ntawm cov duab dithering. Cov ntaub ntawv me me yuav tsum muaj bandwidth tsawg uas tso cai rau kev sib kis tau sai. Nyob rau hauv thaum ntxov hnub ntawm internet, dithering yog ib tug web designer tus phooj ywg zoo tshaj plaws. Lawv tuaj yeem tsim cov vev xaib zoo nkauj dua thaum ua phooj ywg rau kev sib txuas cov ntaub ntawv qeeb dua.
Kev luam tawm hauv luam ntawv
Thaum cov kev txwv ntawm cov laus 8-ntsis thiab 16-ntsis saib tsis muaj kev txhawj xeeb ntxiv lawm, thiab kev txhim kho thev naus laus zis tau dhau los ua qhov tsim nyog rau dithering, nws tseem muaj qee qhov chaw niaj hnub no. Ntau cov qauv ntawm cov tshuab luam ntawv hauv tsev siv dithering. Nws yog tsuas yog txo tus nqi ntawm kev khiav hauj lwm lub tshuab luam ntawv thiab ua kom tus nqi ntawm lub tshuab luam ntawv nws tus kheej qis. Cov tshuab luam ntawv inkjet tshwj xeeb tshuaj tsuag microscopic dots rau ntawm daim ntawv ua ntau yam xim thiab ntxoov ntxoo. Txawm tias cov tshuab luam ntawv monochrome yuav txhais cov duab xim rau hauv cov duab dub dithered los tsim cov duab dub thiab dawb ntawm daim duab.
Kev sib tw hauv Photoshop
Lwm qhov kev siv dav dav ntawm dithering hauv kev ua duab yog kev kos duab. Cov kev pab cuam xws li Photoshop tso cai rau cov kws yees duab thiab cov duab kos duab ntxiv cov nuances zoo siab rau lawv cov duab. Los ntawm kev thov txawv Pattern Overlays rau cov duab, koj tuaj yeem tsim qee cov duab lom zem thiab tshwj xeeb. Koj tuaj yeem hloov cov xim rau dithering los ntawm kev hloov koj cov palette hauv Xim SauIb daim ntawv thov yog hloov daim duab dub thiab dawb rau hauv ib qho uas muaj hnub nyoog nrog dithering thiab sepia tones raws li qhia hauv qab no:
Ntawm no yog thawj daim duab dub thiab dawb. Thaum lub yees duab zoo, los ntawm kev ntxiv qee qhov kev ntxhib los mos thiab xim puv, Photoshop tuaj yeem muab cov duab no rau hauv cov duab kos duab zoo li pom hauv qab no:
A Pattern Overlay ntawm Pastel Ntawv nrog rau Xim Sau ntawm simulated sepia ntxoov ntxoo hauv Photoshop hloov pauv qhov zoo ntawm daim duab.
Hauv Photoshop, los ntawm kev siv qhov sib txawv Pattern Overlays, koj tuaj yeem tau txais ntau yam kev kos duab. Dithering tsis yog qhov chaw txuag xwb tab sis yog txoj hauv kev taug txuj kev nyuaj los qhia koj sab hauv Picasso.
