PNG-format fasali, da aikace-aikace da kuma dalilai domin shahararsa

Daya daga cikin manyan ayyuka fuskantar Imposer na sabon shafukan ne azumi loading shafukan bincike. Tun kadan zane kamar shi ne, ba dukkan masu amfani da su don nemo wani jayayya tsakanin kyakkyawan zane tare da m graphics da kuma gudun da yanar gizo hanya. A baya can, domin ya rage nauyin da images, Developers na shafukan amfani ko GIF, ko JPG. Yanzu kuma da yanar gizo zanen kaya amfani da hotuna a PNG format. Tare, bari mu yi kokarin fahimtar me ya sa wannan yake faruwa.

PNG-format Me ya sa aka buga

Raguwa, wanda shi ne sunan da irin wannan zane, kafa daga farko haruffa na wadannan Turanci kalmomi: šaukuwa cibiyar sadarwa graphics, wanda za a iya fassara a matsayin "placeable graphics don amfani a kan hanyar sadarwa." PNG-format da aka musamman musu sunãyen, ya kawar da rashin matsawa amfani da wani sauki algorithm GIF, wanda sannu a hankali ya fara zama wanda aka rabu amfani. Bugu da kari, shi yana iya zuwa wasu har a yi amfani da su maye gurbin wani yawa ƙato TIFF, amfani da yafi ga tace.

Menene PNG-format

Yau yadu amfani iri biyu daga cikin algorithm. A cikin tsohon harka shi ne amfani da wani 8-bit launi palette, kuma a karo na biyu - 24 bit. Photos a PNG-8 format, idan aka kwatanta da GIF-version bambanta dan kadan mafi matsawa rabo da rashin ikon halitta rayarwa. Duk da cewa irin wannan hotuna zasu iya ƙunsar a kalla 256 launuka, wannan algorithm ne yadu amfani don ƙirƙirar wani zana rubutu, tambura, images tare da jinsin gefuna da kuma hotunan da dan tudu nuna gaskiya. A lokuta inda wannan bai isa ba, developers amfani da 24-bit PNG-format, wanda yana da yawa ƙarin amfanin, kamar:

• M matsawa algorithm, wanda rage wa kõme ba wani asarar quality.
• Da ikon yin amfani da alpha nuna gaskiya samar 256 bangarori daban-daban na nuna gaskiya.
• A gaban gamma gyara, wanda ta atomatik daidaita haske da image a lokacin da wasa a daban-daban shirye-shirye.
• Da ikon yin amfani da game da 16,7 miliyan launuka.

Duk wannan facilitates aikace-aikace PNG24 tare don damfara wani image hada da da m rabo na zane da mafi launuka da kaifafan gefuna na image.

ci gaba Trend

Duk da cewa baza PNG-format har yanzu tilasta by mazan bincike, kazalika da kasa da kuma bai cika goyon bayan wannan algorithm fasali a cikin sabon versions, PNG for yanar gizo graphics ne sosai alamar rahama. Idan aka kwatanta da GIF yana da uku da manyan abũbuwan amfãni: hanyar alfa, gamma gyara da kuma biyu-girma interlacing (a Hanyar m nuni hotuna). Kuma idan aka kwatanta da JPEG ba ta da asarar quality. Lura cewa PNG-format da aka kirkiro ta hanyar Janairu 4, 1995. Tun daga nan na tsawon shekaru 18 sun wuce, kuma ya zama wani gubar ga amfani a yanar, GIF turawa a cikin na biyu wuri. Mai al'ada graphics software (misali MS Fenti) a yau soma shi a matsayin misali ga ceton fayiloli "by default". Kila, idan ba animation da kuma quirks da mazan versions Internet Explorer, GIF ba da hanyar da kishiya a baya.