Tilmaamo PNG-format, codsiga iyo sababaha ay caanka ah

Mid ka mid ah hawlaha ugu muhiimsan ee soo food saartay Imposer ee goobaha cusub waa daalacashada pages loading degdeg ah. Tan iyo design yar la mid ma aha oo dhan users leedahay in la helo tanaasul u dhexeeya design u qurux badan oo leh muuqaallo xarrago leh iyo xawaaraha khayraadka internetka. Hadda ka hor, si loo yareeyo miisaanka sanamyadii, horumarinta goobaha loo isticmaalo ama GIF, ama JPG. Haddaba samaynta web iyo aad u badan isticmaalaan sawirada nooca PNG. Si wadajir ah, aynu isku day inaad fahanto sababta ay tani ka dhacaya.

PNG-format Maxaa asal

Gaabiyay, kaasoo ah magaceeda noocan ah ee sawirka, soo sameeyey xarfaha hore ee erayada soo socda English: ". Naqshadeynta placeable loogu isticmaalo shabakadda" naqshadeynta network la qaadi karo, taas oo loo tarjumi karaa sida PNG-format ayaa si gaar ah ku tashaday in la baabi'iyo darrada riixo isticmaalaya GIF ah isku geynta fudud, taas oo si tartiib ah u bilaabay inuu noqdo huriye. Intaa waxaa dheer, waxaa laga yaabaa ilaa xad in la isticmaalo si uu u bedelo TIFF badan weyn, loo isticmaalo inta badan u tafatir.

Waa maxay PNG-format

Maanta si weyn loo isticmaalaa laba nooc oo isku geynta ah. In kiiska hore waxa uu ku dalbatay 8-bit palette midabka, iyo labaad - 24 yara. Photos in PNG-8 format, marka la barbar dhigo GIF-version duwan tahay wax yar ka fiican ratio riixo iyo la'aanta awood si ay u abuuraan animations. In kasta oo xaqiiqda ah in images sida ku jiri kara ugu badnaan 256 midabo, isku geynta this waxaa si balaadhan looga isticmaalaa in lagu abuuro a text garaafyada, logos, images la geesaha Cad Cad iyo images leh hufnaan Wehliyaha. Mararka ay dhacdo this kuma filna, horumarinta isticmaalaan 24-bit PNG-format, taas oo uu leeyahay wax badan oo ka mid ah faa'iidooyinka dheeraad ah, sida:

• geynta riixo Sare, taas oo yaraynaysa siima khasaaraha ka mid ah oo tayo leh.
• Awoodda in ay isticmaalaan hufnaan Alfa bixisaa 256 heerarka kala duwan ee daahfurnaanta.
• Joogitaanka saxo gamma, taas oo si toos ah ula qabsadaan dhalaalka image marka ciyaaro barnaamijyada kala duwan.
• Awoodda in ay isticmaalaan 16.7 milyan oo midabo.

Waxaas oo dhan wada fududeeyaa PNG24 codsiga ku cadaadisaa image kasta oo ka kooban qaybaha hufan ee sawiro midabyo badan iyo geesaha fiiqan ee image ah.

arrimuhu horumarinta

In kasta oo xaqiiqda ah in faafidda PNG-format weli ka cidhiidhyami daalacashada ka weyn, iyo sidoo kale taageero ku filan oo aan dhamaystirnayn oo muuqaalada geynta this ee versions cusub, PNG for naqshadeynta web waa mid aad u rajo. Marka la barbar dhigo GIF waxa ay leedahay saddex faa'iidooyin waaweyn: channel Alfa ah, iyo hagaajinta gamma iyo interlacing laba dhinac-cabbir (hab ka mid ah sawirada bandhigay horumar leh). Oo jpeg marka la barbar dhigo waxa uu leeyahay maya luma tayada. Ogow in PNG-format ayaa la Been abuurtay by January 4, 1995. Tan iyo markaas 18 sano ayaa ka soo wareegtay, oo wuxuu noqday hogaanka loo isticmaalo ee websites, GIF riixaya galay kaalinta labaad. Inta badan caadadii software muuqaallo kale (sida Rinjiga MS) ayaa maanta u qaatay sida caadiga ah loogu talagalay badbaadinta files "by default". Malaha, haddii aan animation iyo quirks ee qoraalkii ka weyn Internet Explorer, GIF in la siiyo si ay ay xafiiltamaan hore.