JPEG
JPEG cov duab yog nyob rau hauv raster graphics duab cov ntaub ntawv hom chav kawm, uas tsim cov duab los ntawm ib tug bitmap los yog dot matrix network ntawm pixels. Tus qauv JPEG txhais lub CODEC (Coder - Decoder) kom code cov duab mus rau hauv byte kwj thiab txiav txim siab byte kwj los tsim cov duab. Hauv coding, qhov poob compression hla / cia mus rau cov ntsiab lus ntawm daim duab kom txo cov ntaub ntawv loj nyob ntawm qhov xav tau compression. Lub degree ntawm kev nthuav dav ploj yog tshwm sim los ntawm kev sib pauv ntawm qhov loj me thiab qhov zoo ntawm cov duab. Txawm li cas los xij, JPEG tso cai rau 24-ntsis input ib pixel, uas ua rau cov duab xim tiag tiag thaum encoding. Hauv feem ntau JPEG cov ntaub ntawv, ICC xim profile yog kos, xws li sRGB lossis Adobe RGB.
Cov hom ntawv JPEG ua tau zoo tshaj plaws nrog cov duab tiag tiag lossis cov duab nrog kev hloov pauv, xim du thiab tonal. Txawm li cas los xij, nws qhov kev ua tau zoo qis dua rau cov kab duab xws li logos, cov ntawv sau thiab cov ntawv tas luav, uas tau hloov pauv sai sai ntawm cov xim hla cov kab pixels. Tsis tas li ntawd, JPEG tsis haum rau cov duab uas tau rov qab kho cov digital. Ib qho kev nthuav dav yuav ploj txhua zaus thaum compression thiab decompression ua tiav. Yog li ntawd, nws tsis haum rau cov duab uas yuav tsum tau precision thiab siab daws teeb meem xws li cov duab scientific, cov duab kuaj mob, thiab cov kab kos navigational.
Xyoo 1992 tso tawm ntawm JPEG Hloov Hloov Hom (JIF) ua rau qee qhov teeb meem siv tau thiab txhawm rau kov yeej cov kev tsis txaus no ob peb lwm cov qauv tau qhia tom qab. JPEG/File Interchange Format (JFIF) thiab JPEG/Exchangeable Image File Format (JPEG/Exif) yog hom JPEG feem ntau siv. JFIF yog cov qauv siv ntau tshaj plaws rau lub ntiaj teb thoob plaws lub vev xaib thaum JPEG / Exif yog hom ntawv siv ntau tshaj plaws rau cov koob yees duab digital thiab cov duab digital kho.
JPEG cov ntaub ntawv siv ntau yam ntaub ntawv txuas ntxiv..jpg, thiab-j.webp
PNG
PMG cov ntaub ntawv siv cov ntaub ntawv txuas ntxiv.png
• Ob leeg-p.webp
• JPEG cov duab yog qhov zoo tshaj plaws rau cov duab thaij duab nrog kev hloov pauv ntawm cov xim, tab sis hom-p.webp
• JPEG tsis haum rau kev rov kho dua, vim qhov poob qis.-p.webp
