Iinjineli ezivela kwi-Intel ziye zazisa ifomathi yemifanekiso yeSpectral JPEG XL, elungiselelwe ukucinezelwa okusebenzayo kwemifanekiso egubungela imimandla yembonakalo engaphaya kwembonakalo ebonakalayo. Ifomathi ecetywayo inikezela ngezakhono ezifana ne-spectral edition ye-OpenEXR ifomathi, kodwa ngokungafaniyo neyokugqibela, inika i-coding yokulahleka, evumela ukunciphisa ubungakanani befayile ngamaxesha angama-10-60 xa kuthelekiswa nokunyanzeliswa okungenakulahlekelwa.
Imifanekiso ye-Spectral ayiqulathanga kuphela ulwazi malunga nokukhanya kokukhanya kwiitshaneli ezintathu zemibala ephambili (RGB), kodwa ikwagubungela inxalenye ye-ultraviolet kunye ne-infrared ranges. Imifanekiso enjalo isetyenziswa kwiindawo ezinjengokunikezelwa komgangatho ophezulu, uhlalutyo lwemathiriyeli, kunye nokubonwa kwedatha yesayensi. Umzekelo, imifanekiso ye-spectral ingasetyenziselwa ngokuchanekileyo imodeli ye-real-world optical effects ekunikezelweni, ukuvavanya indlela ipeyinti ebonakala ngayo phantsi kwezibane ezahlukeneyo, kunye nokuchonga imathiriyeli ngeesignesha zabo zokukhanya.
Ukudubula ngaphaya kwe-spectrum ebonakalayo kuvumela umfuziselo ochanekileyo ngakumbi wendlela ukukhanya okusebenzisana ngayo nezinto, kodwa kukhokelela ekunyukeni okukhulu kolwazi olugcinwe kwi-pixel nganye. Imifanekiso yeSpectral inokubandakanya uninzi lwetshaneli ezigubungela amanqanaba obude obuhlukeneyo kwaye isebenzise i-16- okanye i-32-bit amanani amanqaku adadayo kwisitishi ngasinye, ebavumela ukuba bagubungele uluhlu olubanzi lwamaxabiso okukhanya kuneefoto eziqhelekileyo. Ixabiso lesi sikhundla kukunyuka okuphawulekayo kobukhulu xa kuthelekiswa nemifanekiso yendabuko. Ngokomzekelo, umfanekiso onamatshaneli e-spectral eyongezelelweyo angama-81 ukhankanywe, othatha i-300 MB kwifomathi ye-OpenEXR. Ukusebenzisa iSpectral JPEG XL, lo mfanekiso waxinzelelwa kwi-3.9 MB ngaphandle kokulahlekelwa yimpawu zespectral.
Ukunciphisa ubungakanani, i-Spectral JPEG XL isebenzisa ulwahlulo lwedatha yokukhanya kunye ne-spectral shape, kwaye isebenzisa i-discrete cosine transform ukuze igcine iimpawu ezibalulekileyo ze-spectral kodwa ilahle iinkcukacha ezingabalulekanga eziphezulu ze-spectral. Undoqo wendlela kukuguqula utshintsho olugudileyo kwiimpawu zamaza kwiseti ye-coefficients yamaza (i-frequency coefficients), ethi, xa idityanisiwe, iphinde iphinde iphinde iphinde iphinde iphinde iphinde iphinde iphinde ifake ulwazi lwe-spectral.
Ii-coefficients ze-spectral eziphakamileyo eziphezulu zenziwa njengesiqhelo malunga nokukhanya okupheleleyo, ukuvumela idatha engabalulekanga ukuba ixinzelelwe ngamandla. Ingcinga yeyokuba ngokwembono i-avareji yokukhanya ibaluleke kakhulu kwaye igcinwe kowona mgangatho uphezulu, ngelixa i-coefficients ephezulu yefrikhwensi ayibalulekanga kangako kwaye ixhomekeke kumanqanaba aphezulu oxinzelelo kunye nezigqibo ezisezantsi ngokuzikhethela. Emva koko, ulwazi lucutshungulwa yi-codec ephunyezwe ngesiseko se-injini yoxinzelelo ekhoyo ephuhliswe kwifomethi yeJPEG XL.
umthombo: opennet.ru
