Yai, ndipo ndi chinthu chimodzi chofunikira kudziwa za mtundu. Kawirikawiri, kupulumutsa kumayendetsanso kuwonongeka kwa encoder pazithunzi zomwe zakhala zikuyenda, motero zigawo za artefacts - zomwe zimawoneka ngati zoletsa m'mawu ndi haloes pazovuta zazikulu pambuyo pa zaka zambiri. Sinthani kuchokera ku master yopanda kusowa ndi kutumiza ku JPG kamodzi, pamapeto pake, kuposa kutsegulanso ndikubwezeretsanso fayilo yomweyo. JPG ndi lossy: chithunzi chimasinthidwa ndi DCT, quantised, ndi entropy-coded, ndi quality knob kuwongolera momwe ambiri ndi kuthyola.
Nchifukwa chiyani kamkodwe ndi kachitidwe ka kachitidwe ka kachitidwe ka JPG?
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Chifukwa mtundu ndi wosavuta kulemba pa real-nthawi pa hardware modest, ndipo chifukwa chiyambi cha kujambula zida anapanga m'madera ake ndi nthawi zonse kusinthidwa. The chipangizo sichichita chisankho chabwino, ndi kulemba zimene zake firmware akudziwa. Izi ndi chifukwa chakenso mavidiyo ndi zochepa kwa zimene ali ndi chifukwa chake kusintha iwo ndi nthawi zambiri chinthu choyamba aliyense amachita. JPG ndi JPEG standard kuchokera 1992, ndipo pambuyo zaka zitatu ndibe format ambiri kamera ndi ambiri mawebusaiti kugwiritsa ntchito kwa zithunzi.
Nchifukwa chiyani kumbuyo kwakuwonekera kwazithunzi zanga zakhala zofiira mu JPG?
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Chifukwa JPG siyimakhala ndi njira ya alfa yoti ikhalemo. Mtundu uliwonse wa pixel umafunika kukhala ndi mtundu wolimba, choncho kuwala kwazithunzi kumapangidwa motsutsana ndi kumbuyo - kuwala koyambirira - nthawi yomwe fayilo idzalemba. Sichingakhalepo chilichonse chobwezeretsedwanso pambuyo pake. Ngati chithunzi chiyenera kukhala patsamba lowala kapena pazithunzi, sinthani ku mtundu womwe umasunga kuwala kwazithunzi. JPG alibe kuwala, degraded m'tsogolo nthawi iliyonse kuti ndi re-kupulumutsa, ndi kutulutsa zooneka kuletsa pa flat mtundu ndi zosaoneka malemba.
Kodi JPG imatha kusamalira CMYK yosindikiza?
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Ikhoza, amene ndi chifukwa chake fayilo kuchokera kusindikiza workflows nthawi zina kuwoneka zosadziwika pazenera: zobiriwira ndi zoperekedwa mu inki peresenti kwa kusindikiza kuposa kuwala kwa monitor. ambiri web-facing mtundu ndi RGB okha, kotero kusintha ayenera kutanthauzira, ndi kutanthauzira ndi zosawerengeka - saturated cyan ndi orange shift kwambiri. Kwa chilichonse kuyendera kwa wosindikiza, kusamalira oyambirira mbali iliyonse inu kusintha.
Kodi ndi vuto kuti JPG ili ndi zaka zoposa makumi atatu?
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Age yekha si vuto - angapo mtundu kuchokera kuti nthawi ndibe bwino, makamaka chifukwa chilichonse chili ndi zaka kuti akwaniritse iwo. Zimene zikukhudza ndi zimene nthawi anaganiza: mavidiyo ang'onoang'ono, mofulumira processors, palibe netiweki, ndi zizindikiro aliyense anafunikabe. Pamene zimene anaganizabebe, mtundu ndi bwino. Pamene iwo sachita, kuti ndi chifukwa chosintha.
Kodi kamera ndi malo a metadata amasungidwira pamene ndimasintha JPG?
