Koj yuav yooj yim rhuav tshem cov duab zoo los ntawm compressing nws ntau dhau lossis ntau dhau. Compression hauv kev yees duab digital yog lub cuab yeej tswj hwm cov duab muaj zog, muab cov txheej txheem siv nrog kev saib xyuas.
Dab tsi yog Compression?
Compression txo qhov loj ntawm cov ntaub ntawv ntawm lub computer, suav nrog cov duab cov ntaub ntawv. Txawm li cas los xij, rau cov duab, compression tsis yog ib qho zoo vim tias compression tuaj yeem cuam tshuam cov duab zoo.
Txoj kev yees duab sib txawv ntawm cov koob yees duab DSLR thiab khoos phis tawj siv ntau theem ntawm compression. Thaum cov duab raug compressed-hauv lub koob yees duab lossis cov ntaub ntawv hauv computer-tsawg yog nyob rau hauv cov ntaub ntawv, thiab cov ntsiab lus zoo dua ntawm cov xim, qhov sib piv, thiab qhov ntse raug txo.
Nrog cov ntawv compression xws li pom hauv JPEG cov ntaub ntawv, koj yuav haum ntau cov ntaub ntawv rau hauv lub koob yees duab nco daim npav, tab sis koj tseem yuav txi zoo. Advanced kws yees duab zam compression los ntawm kev tua RAW cov ntaub ntawv, uas tsis muaj compression siv rau lawv. Txawm li cas los xij, rau kev yees duab dav dav, qhov compression pom hauv JPEGs tsis yog qhov teeb meem loj.
Nco ntsoov Compression
Qhov txawv ntawm cov qauv compression yuav tsis pom ntawm lub koob yees duab lub vijtsam LCD lossis txawm tias lub khoos phis tawj saib. Nws yog qhov tseeb tshaj plaws thaum cov duab luam tawm, tshwj xeeb tshaj yog tias nws loj tuaj. Txawm tias qhov zoo ntawm 8-nti-los-10-nti degrades nrog ntau compression. Txawm li cas los xij, yog tias koj tsuas yog sib koom ib daim duab hauv kev tshaj xov xwm, qhov kev poob zoo los ntawm kev compression tsis txaus kom pom tau.
Tshawb xyuas koj lub DSLR qhov chaw kom paub tseeb tias koj tsis tau ntim cov duab los ntawm lub neej ntawd.
How Digital Compression Works
Ib lub sensor ntes cov ntaub ntawv ntau dua li tib neeg lub qhov muag tuaj yeem ua tau. Yog li ntawd, qee cov ntaub ntawv no tuaj yeem raug tshem tawm thaum lub sijhawm compression yam tsis muaj tus saib pom.
Lub tshuab compression saib rau txhua qhov chaw loj ntawm cov xim rov ua dua thiab tshem tawm qee qhov chaw rov ua dua. Cov cheeb tsam no rov tsim kho dua tshiab hauv cov duab thaum cov ntaub ntawv nthuav dav, dhau los ntawm cov txheej txheem cuam tshuam.
Ob Hom Duab Compression
Ob hom compression yog lossless thiab poob, thiab lawv txhais raws nraim li cas lawv suab zoo li lawv txhais.
Lossless Compression - zoo ib yam li tsim ZIP cov ntaub ntawv hauv computer. Cov ntaub ntawv yog compressed kom nws me me, tab sis tsis muaj qhov zoo ploj thaum cov ntaub ntawv tau muab rho tawm thiab qhib ntawm qhov loj me. Ib daim duab uas tau dhau los ntawm ib daim ntawv lossless compression yog zoo tib yam rau cov duab qub. TIFF yog hom ntaub ntawv siv ntau tshaj plaws uas siv lossless compression.
Lossy Compression - ua haujlwm los ntawm kev muab qee cov ntaub ntawv pov tseg, thiab tus naj npawb ntawm compression thov tuaj yeem xaiv los ntawm tus kws yees duab. JPEG yog hom ntaub ntawv feem ntau siv rau kev poob compression. Nws tso cai rau cov kws yees duab txuag chaw ntawm daim npav nco lossis tsim cov ntaub ntawv tsim nyog rau kev xa email lossis tshaj tawm online. Txawm li cas los xij, txhua zaus koj qhib, hloov kho, thiab tom qab ntawd khaws cov ntaub ntawv lossy, me ntsis nthuav dav ntxiv tsis tuaj yeem ploj mus.
Lub tswv yim kom zam dhau qhov teeb meem compression
Tsis txhob poob cov duab zoo rau compression:
- Tua hauv RAW yog tias koj lub koob yees duab tso cai rau koj. Yuav daim npav uas tuav cov ntaub ntawv ntxiv yog tias koj khiav tawm tsam qhov chaw txwv. RAM tam sim no pheej yig, thiab nws muaj peev xwm yuav 64GB nco phaib lossis loj dua.
- Txuag koj cov duab ua haujlwm thiab ua tiav cov duab ua TIFFs. Tom qab koj hloov cov duab los ntawm RAW hom ntawv, txuag nws rau hauv ib hom ntawv lossless thiab khaws nws ruaj ntseg. Siv JPEG compression ntawm ib daim qauv ntawm cov duab qub rau kev sib koom.
- Ntawm kev khaws cov ntaub ntawv JPG. Txhua zaus koj qhib thiab khaws cov ntaub ntawv lossy compression zoo li JPEGs, koj poob duab zoo.
