Vim li cas cov kws yees duab xav kom lawv txhawj xeeb txog lawv tus kheej nrog Image Compresssion
Compression yog ib qhov teeb meem loj thaum nws tuaj cuag cov duab thiab nws yog ib qho yooj yim heev rau kev puas tsuaj ib daim duab zoo heev los ntawm compressing nws ntau dhau lawm thiab ntau zaus. Nws yog ib qho tseem ceeb kom nkag siab yuam kev hauv digital photography, yog li koj tuaj yeem tswj nws kom ua tau raws li qhov xav tau ntawm ib daim duab.
Dab tsi yog Compression?
Siv kom nruj siv los txo qhov me me ntawm cov ntaub ntawv hauv computer, nrog rau cov duab cov duab. Cov ntaub ntawv raug muab txo los txo lawv cov me thiab ua rau lawv yooj yim dua rau hauv lub vas sab. Txawm li cas los, thaum nws tawm mus rau cov duab, compression tsis yog ib txwm zoo tshaj plaws.
Txawv cov ntaub ntawv tawm tswv yim ntawm DSLR koob yees duab thiab computers siv ntau theem ntawm compression. Thaum twg cov duab raug compressed (hauv lub koob yees duab lossis lub computer) nws muaj cov lus qhia tsawg dua hauv cov ntaub ntawv thiab cov ntsiab lus ntawm cov xim, qhov sib txawv, thiab qhov tseeb yuav txo.
Nrog ib tus qauv compression xws li uas pom muaj nyob rau hauv ib daim ntawv JPEG, koj yuav muaj peev xwm kom haum ntau cov ntaub ntawv mus rau lub koob yees duab daim npav nco, tab sis koj kuj yog txi zoo. Cov duab thaij duab zoo kom tsis txhob muaj kev ywj pheej ntawm cov ntaub ntawv RAW, uas tsis muaj yawm compression rau lawv. Txawm li cas los xij, rau kev thaij duab, qhov kev txuam pom nyob hauv JPEG tsis yog ib qho teeb meem loj.
Lus Cim Tseg
Qhov sib txawv ntawm cov ntaub ntawv sau tawm yuav tsis pom nyob rau ntawm lub koob yees duab 's LCD los yog lub computer saib. Nws yuav yog qhov tshwm tshaj thaum luam duab thiab yuav ua si lub luag haujlwm yog tias koj npaj siab rau qhov duab ntawd kom loj. Txawm tias qhov zoo ntawm 8x10 luam tuaj yeem cuam tshuam los ntawm ntau dhau lawm. Tab sis yog tias koj tsuas yog sib koom ib daim duab rau hauv kev tshaj tawm, kev poob siab tsis zoo los ntawm kev yuam kom tsis txhob cuam tshuam rau koj txaus kom pom.
Cov duab thaij duab tau zoo heev hauv xyoo tas los. Ntau cov kev pabcuam xav tau lub koob yees duab nta nrog ntau lub megapixels thiab yuav txuas ntxiv mus. Txawm li cas los xij, yog tias tib tug kws yees duab tsis kam mloog kev nruj ntawm lub sij hawm tus duab raug ntes tom qab tsim khoom thiab cia khoom, ces lawv tsuas khib cov nqi ntxiv uas lawv tau them rau.
Cas Digital Compression Ua Tau Hauj Lwm
Cov zis yog ob txheej txheem.
Ua ntej, lub digital sensor muaj peev xwm ntawm capturing deb tshaj cov ntaub ntawv tshaj li qhov muag tib neeg muaj peev xwm ua tau. Yog li, qee yam ntawm cov ntaub ntawv no tuaj yeem raug tshem tawm thaum lub sij hawm tsis tuaj yeem tsis muaj tus neeg saib xyuas tau pom kev!
Qhov thib ob, qhov kev txhim kho compression yuav xyuas seb cov cheeb tsam loj ntawm cov xim zoo li cas, thiab yuav tshem tawm qee thaj chaw rov qab. Tom qab ntawd, lawv yuav rov qab kho cov duab hauv daim duab thaum muab cov ntaub ntawv txhab ntxiv.
Ob Hom Kev Duab Zauv
Nws yog ib qho tseem ceeb kom nkag siab txog ob hom kev sib txuam kom peb thiaj li to taub qhov tshwm sim lawv muaj ntawm cov ntaub ntawv.
Tsis Ncaj Ncees
Qhov no zoo ib yam li tsim kom muaj ZIP cov ntaub ntawv ntawm lub computer. Cov ntaub ntawv yog muab khi ua kom tsawg dua, tab sis tsis muaj kev poob zoo thaum cov ntaub ntawv muab rho tawm thiab qhib thaum puv loj. Nws yuav zoo tib yam rau thawj daim duab.
TIFF yog hom ntaub ntawv uas siv ntau tshaj plaws uas siv los ua kom tsis yuam kev.
Lossy Compression
Qhov kev sib txuam ntawm kev sib txuam no los ntawm kev muab cov lus qhia thiab cov nqi ntawm cov ntaub ntawv thov tau xaiv los ntawm tus kws yees duab.
JPEG yog hom ntaub ntawv uas siv ntau tshaj plaws rau kev quab yuam lossi compression, thiab nws tso cai rau kev pabcuam kom txuag tau chaw nyob ntawm cov ntawv cim xeeb lossis tsim cov ntaub ntawv tsim rau e-xa lossis xa hauv online. Txawm li cas los xij, nws yuav tsum raug sau tseg tias txhua zaus koj qhib, hloov, thiab rov qab los txuag tau cov ntaub ntawv "los yog", ib qho me ntsis ntxiv.
Cov Lus Qhia Kom Txhob Muaj Teeb Meem Sib Sau
Muaj cov kauj ruam uas ib tug kws yees duab yuav ua tau kom tsis txhob poob qhov zoo ntawm lawv cov duab rau compression.
- Tua hauv RAW yog tias koj lub koob yees duab tso cai rau koj. Yog tias cov ntaub ntawv loj thiab cia muaj peev xwm yog qhov teeb meem rau koj, tau cov ntawv teev lus qhia ntxiv. RAM yog tam sim no pheej yig thiab nws yog pheej yig muag muas 16 los yog 32 GB nco phaib. Qhov no tsis yog kev zam txim rau!
- Txuag koj cov ntaub ntawv ua tiav thiab tiav cov ntaub ntawv ua ib TIF. Ib zaug tom qab los ntawm RAW thiab koj tau kho koj cov dluab, txuag cov duab kawg hauv cov ntawv hom lossless thiab khaws ntawd securely. Tsuas siv cov JPG rau kev sib qhia, tab sis txhua zaus koj yuav tsum tau ua haujlwm ntawm cov ntaub ntawv kom hloov kho, rov qab mus rau cov ntaub ntawv poob.
- Tiv thaiv txuag dhau JPG ntaub ntawv! Raws li tau hais los saum toj no, txhua zaus uas koj qhib thiab rov txuag tau cov ntaub ntawv sau los yog cov ntaub ntawv JPG, koj plam duab zoo thiab ua ntej koj paub, koj yuav tau sab laug nrog ib daim duab ntawm mush.