-PNG-format izici, isicelo kanye nezizathu ukuthandwa

Munye walemisebenti main zibheke Imposer amasayithi entsha kuyashesha ukulayisha Amakhasi iziphequluli. Kusukela design sakugcina like akusiyo bonke abasebenzisi kufanele uthole ebucayini phakathi idizayini enhle nge ihluzo nenhle futhi ijubane umthombo sewebhu. Ngaphambili, ukuze kuncishiswe isisindo izithombe, Onjiniyela izindawo ezisetshenziswa noma i-GIF, noma i-JPG. Manje nabaqambi bamawebhu ezingasho zisebenzisa izithombe PNG. Ndawonye, masizame ukuqonda ukuthi kungani lokhu okwenzekayo.

-PNG-format Kungani laqanjwa

Isifinyezo, okuyinto igama lolu hlobo umdvwebo, kwakhiwa kusuka izinhlamvu zokuqala amagama alandelayo IsiZulu: ". Ihluzo placeable ukusetshenziswa kunethiwekhi" inethiwekhi ephathekayo ihluzo, okungase elihunyushwe ngokuthi -PNG-format iye ngqo basungula ukuqeda nemibi kokucindezelwa usebenzisa algorithm-GIF elula, okuyinto Kancane kancane ngaqala ukuba zibuye ziphelelwe isikhathi. Ngaphezu kwalokho, kungase ngezinga elithile isetshenziselwe ukushintsha TIFF kakhulu besiyoba sikhulu, isetshenziswa ngokuyinhloko ukuze lihlelwe.

Uyini-PNG-format

Namuhla kabanzi ezimbili izinguqulo algorithm. Endabeni wangaphambili lapho isetshenziswa i-8-bit umbala Palette, futhi okwesibili - 24 bit. Izithombe e-PNG-8 format, kuqhathaniswa-GIF-inguqulo ehlukile kancane kangcono zlib isilinganiso kanye ukuntula kwakhe ikhono ukwakha animations. Naphezu kweqiniso lokuthi izithombe ezinjalo lingaba nesibalo esiphezulu 256 imibala, lo algorithm is kabanzi ukudala sokuqhafaza umbhalo, amalogo, izithombe imiphetho abahlukene futhi izithombe obala umyela. Ezimeni lapho leli akwanele, onjiniyela zisebenzisa 24-bit PNG-format, okuyinto has a lot of izinzuzo ezengeziwe, ezifana:

• Uphakeme kokucindezelwa algorithm, okuyinto kunciphisa idilike nanoma ikuphi ukulahleka izinga.
• Ikhono ukusebenzisa i-alpha obala inikeza amazinga 256 ezahlukene obala.
• Ukuba khona gamma ukulungiswa, okuyinto ngokuzenzakalelayo ulungise ukukhanya isithombe uma udlala ezinhlelweni ezahlukene.
• Ikhono usebenzise imibala abangaba yizigidi ezingu-16.7.

Konke lokhu kusiza PNG24 isicelo ndawonye cindezela yimuphi umfanekiso ezakha izingxenye esobala imidwebo ngemibala ngaphezulu futhi imiphetho ebukhali yesithombe.

ukuthuthukiswa mkhuba

Naphezu kweqiniso lokuthi ukusabalala-PNG-format namanje sibambekile iziphequluli amadala, kanye nokwesekwa enganele futhi akuphelele lokhu izici algorithm ezinguqulweni ezintsha, i-PNG for ihluzo iwebhu ethembisa kakhulu. Kuqhathaniswa-GIF unezinzuzo ezintathu ezinkulu: isiteshi-alpha, gamma ukulungiswa kanye kunokubhanqanisa lamabili (indlela okuqhubekayo ukubonisa izithombe). Futhi uma kuqhathaniswa ne-JPEG alinaso ukulahlekelwa izinga. Qaphela ukuthi i-PNG-format yasungulwa ngo-January 4, 1995. Kusukela ngaleso sikhathi iminyaka engu-18 ashona, futhi waba phambili ukusetshenziswa kumawebhusayithi, GIF baphokophelele endaweni yesibili. Iningi ngokwezifiso isofthiwe ihluzo (isib MS Paint) namuhla bakwamukela njengezinga elifanayo lokulondoloza amafayela "ngokuzenzakalelayo". Mhlawumbe, uma kungekhona izithombe kanye nezimfanelo ezingavamile zomunye of izinguqulo ezindala i-Internet Explorer, i-GIF akhale imbangi yayo ngaphambili.