2Sankhani mmene zovuta kupweteka: quality kapena bitrate zofuna, ndi optionally ochepa kutalika ngati kukula ndi zofunika kwambiri kwa inu kuposa deta.
3Kuyamba ntchito ndi kulola ogwira ntchito re-kupaka wapamwamba; wanu oyambirira si nthawi zonse anasintha m'malo.
4Poyerekeza ndi kukula kwatsopano ndi mtundu wachibadwa, kenako ndikutsitsa fayilo ya JPG yosinthidwa.
Kuchepetsa JPG Mafunso Ofala
Kodi Kuchepetsa JPG imapanga fayilo yaying'ono?
+
Concretely, encoder imachitanso DCT quantiser pazomwe mumasankha, kotero kupulumutsa kumachokera ku coarser coefficients osati kuchokera ku pixels ochepa - zigawo za chithunzi sizimasintha, ndipo 80 ndi mtundu wa 80 ndi malo oyenera oyenera. Nothing about it depends on you installing software: the job runs server-side and hands back a finished file.
Kodi ndi ziti zosafunikira zomwe fayilo yanga idzalandira?
+
Zithunzi zazing'ono, zipatso za film ndi kulumikizana kwa sensor noise zimatsutsana ndi kulumikizana; mtundu woyera, malo akuluakulu, kulumikizana kwa line art ndi kulumikizana kwa mawu. Muyenera kuyembekezera kuchepetsa kwakukulu pazithunzi zazithunzi kapena logo ndi kuchepetsa kwachilendo pazithunzi zogwira ntchito.
Kodi mtundu wa fayilo yanga umasintha kuchuluka kwa ndalama zomwe ndingapulumutse?
+
Chotero kwambiri. JPG imasunga RGB ya 8-bit pogwiritsa ntchito DCT yopanda phindu ndi 4: 2: 0 chroma subsampling mosalekeza, kotero malemba oyera ndi olimba ndi zinthu zoyamba zomwe zimayenera kuchepetsedwa. Izi zimatsimikizira kuti pali ma headroom omwe alipo komanso ngati kupulumutsa kumakuwononga chilichonse m'chilungamo.
Kodi pali chinachake chokhacho cha JPG chomwe ndingadziwepo mukadzaza?
+
Yes — zonse kupulumutsa re-kuyenda kwa quantumiser, choncho nthawi zambiri kusinthira ndi kubwezeretsa JPG kumapangitsa kuwonongeka kwa chitukuko ngakhale mutatha kuchepetsa slider yabwino. Ndikofunika kudziwa kuti musanayambe kulemba pazomwe mungafunensonso.
Kodi ndi chiyani cholakwika chofala kwambiri pamene mukutsitsa JPG images?
+
Kuzizira wapamwamba chimodzimodzi mobwerezabwereza. Kawirikawiri pa lossy mtundu ndi chitukuko chatsopano cha kuwonongeka ndi kupulumutsa kuchepetsa pamene kuwonongeka kumawonjezeka. Pitani kuchokera ku asalowe ku cholinga chanu m'njira imodzi, ndipo kusunga asalowe.
Kodi ndikufuna chiyani, ndipo ndingayang'ane bwanji kusiyana kwa ndalamazo?
+
Fayilo imodzi yozizira pa input, pa mlingo wabwino womwe mumasankha kuposa woyamba. Ngati zotsatirazo sizingatheke, kuchepetsa kukula kwa pixels kudzakhala kothandiza kuposa kuchepetsa mlingo wabwino.
Kodi ndingapeze chiyani pa Kuchepetsa JPG?
+
Chomwechocho m'banja la raster lothamanga - JPG, JPEG, JFIF ndi WebP - ndi mafomu osathamanga (PNG, BMP, TIFF) ngati mukufuna kuwaphatikiza m'modzi mwa iwo. Mafomu amawerengedwa kuchokera pamutu wa fayilo, osati kuwonjezeka, kotero chithunzi chosunga ndi suffix yosayenera ikhoza kupita.
Kodi pali malire a kukula kwa fayilo pa Kuchepetsa JPG?
+
Yai: maakaunti aulere amapanga zithunzi mpaka ku 25 MB, zomwe zimakhudza kwambiri kamera iliyonse JPG ndi foni; ntchitoyi imachitika ndi libjpeg-turbo ndi libwebp, mabuku omwewo omwe amagwirizana ndi wolemba deta. Mafayilo akuluakulu ndi chinthu chimodzi chomwe chimalepheretsa chida chosalipira, ndipo chida chokha chili ndi fayilo imodzi kuposa fayilo imodzi.
Kodi Kuchepetsa JPG idzachepetsa mtundu wa JPG images wanga?
+
A lossy chiyambi ndi kale zotsatira za m'modzi quantum pass, ndi chilichonse ntchito kuti ali ndi re-encode amawonjezera mphindi. pamene ntchito angachite popanda kukhudza pixel deta tikuchita kuti m'malo, ndipo pamene simungathe kusankha quality factor nokha kuposa kupeza fixed default.
Kodi chimachitika ndi EXIF ndi mtundu wa profile deta?
+
EXIF ya kamera (ISO, shutter, lens, GPS) ndi ICC profile yophatikizidwa imapita ku default, chifukwa kuchotsa profile ndi komwe kumachititsa kuti mabala azisintha pa kulowanso.
Kodi Kuchepetsa JPG imawononga chilichonse?
+
No. Kuchepetsa JPG ndi ufulu popanda akaunti, palibe watermark pazotulutsa ndi palibe khoma lolembetsa m'mbuyo mwa kutsitsa. Kutsitsa kumatha kuchotsanso nthawi yochepa pambuyo pomaliza ntchito.
