Bits yog siv hauv khoos phis tawj ua cov ntaub ntawv me me sib sau ua ib hom lus uas tus neeg siv tau nyeem. Ib yam li cov khoom siv yog cov ntaub ntawv yooj yim hauv koj lub computer, lawv tau siv hauv kev yees duab digital los ntes cov duab.
Bit stands rau "binary device" thiab hais txog cov ntaub ntawv me tshaj plaws. Nws muaj tus nqi ntawm 0 lossis 1. Hauv kev yees duab digital, 0 raug muab rau dub, thiab 1, rau dawb.
How Bits Record Color
Cov neeg siv cov duab kho duab digital xws li Adobe Photoshop paub txog cov duab me me sib txawv. Cov duab 8-ntsis ntau heev muaj 256 tones, xws li 00000000 (tus nqi 0, lossis dub) txog 11111111 (tus nqi 255, lossis dawb).
Daim ntawv ceeb toom tias muaj yim tus lej nyob rau hauv txhua qhov sib lawv liag. Qhov no yog vim 8 khoom sib npaug 1 byte, thiab 1 byte tuaj yeem sawv cev 256 lub xeev sib txawv (lossis xim). Yog li ntawd, los ntawm kev hloov kev sib txuas ntawm cov 1s thiab 0s hauv qhov sib lawv liag, lub khoos phis tawj tuaj yeem tsim ib qho ntawm 256 qhov sib txawv ntawm cov xim (2^8th hwj chim, nrog 2 los ntawm binary code ntawm 1s thiab 0s).
Kev nkag siab 8-ntsis, 24-ntsis, thiab 12- lossis 16-ntsis
JPEG cov duab feem ntau hu ua 24-ntsis duab. Qhov no yog vim cov ntaub ntawv no tuaj yeem khaws tau txog 8 cov ntaub ntawv hauv txhua qhov ntawm peb cov xim raws (RGB, lossis liab, ntsuab, thiab xiav).
Cov nqi siab dua xws li 12 lossis 16 yog siv hauv ntau DSLRs los tsim kom muaj ntau yam xim. Daim duab 16-ntsis tuaj yeem muaj 65, 653 qib ntawm cov ntaub ntawv xim (2^16th lub zog), thiab 12-ntsis duab tuaj yeem muaj 4, 096 qib (2^12th zog).
DSLRs siv feem ntau ntawm cov suab nrov ntawm qhov ci ntsa iab, uas tawm ob peb lub suab rau qhov tsaus ntuj tshaj plaws (qhov twg tib neeg lub qhov muag nyob ntawm nws qhov rhiab tshaj plaws). Txawm tias 16-ntsis duab, piv txwv li, yuav tsuas muaj 16 tones los piav txog qhov tsaus ntuj tshaj plaws hauv daim duab. Qhov zoo tshaj plaws nres, hauv kev sib piv, yuav muaj 32, 768 tones!
About Printing Dub thiab Dawb Duab
Lub tshuab luam ntawv inkjet nruab nrab ua haujlwm ntawm 8-ntsis nplai, ib yam nkaus. Thaum luam tawm cov duab dub thiab dawb ntawm koj lub inkjet, tsis txhob teeb nws los luam tawm siv cov xim dub nkaus xwb (greyscale printing). Qhov no yog ib txoj hauv kev zoo kom txuag tau tus cwj mem thaum luam tawm cov ntawv, tab sis nws yuav tsis tsim cov duab zoo.
Lub tshuab luam ntawv nruab nrab muaj ib qho, tej zaum ob, xim dub number case cartridges thiab peb xim cartridges (hauv CMYK). Lub khoos phis tawj xa cov ntaub ntawv ntawm cov duab los luam tawm siv cov 256 hom xim.
Yog tias koj yuav tsum cia siab rau tsuas yog cov number case cartridges dub los tswj qhov ntau, cov ntsiab lus ntawm daim duab yuav ploj mus, thiab gradients yuav tsis luam tawm kom raug. Nws tsuas yog tsis tuaj yeem tsim 256 qhov sib txawv uas siv ib daim cartridge.
Txawm tias daim duab dub thiab dawb yog qhov tsis muaj xim, nws tseem tso siab rau cov xim zoo nkauj 8-ntsis xim raws los tsim txhua yam sib txawv ntawm cov xim dub, grey, thiab dawb. Yog tias koj yog tus kws yees duab, qhov kev cia siab ntawm cov xim raws li no yog qhov tseem ceeb kom nkag siab yog tias koj xav tau cov duab digital nrog cov duab dub thiab dawb uas tau tsim los ntawm zaj duab xis rau ntawm daim ntawv.
