Iimpawu PNG-format, isicelo kunye nezizathu ukuthandwa

Omnye wemisebenzi engundoqo ejongene Imposer kweendawo ezintsha akakhawulezi ukulayisha amaphepha izikhangeli. Ekubeni kuyilo lokugcina ngokungathi akukho bonke abasebenzisi kufuneka ukuba ufumane kwizibhambathiso phakathi design elihle imizobo ezintle kunye isantya web resource. Ngaphambili, ukwenzela ukunciphisa ubunzima imifanekiso, abaphuhlisi kweendawo ezisetyenziswayo okanye GIF, okanye JPG. Ngoku web abayili ngakumbi nangakumbi usebenzisa imifanekiso ngefomathi ye PNG. Sisonke, makhe sizame ukuqonda ukuba kutheni oku kuyenzeka.

PNG-format Kutheni livele

Ufinyezo, lona igama olu hlobo umzobo, wabumba oonobumba bokuqala la magama alandelayo IsiNgesi: ". Yemizobo placeable ukusetyenziswa kwi network" yemizobo womnatha eziphathwayo, apho kungenziwa eliguqulelwa ngokuthi PNG-format iyilelwe ngqo ukuze kupheliswe izingeloncedo ucinezelo usebenzisa GIF algorithm elula, eyaqala kancinane ukuba abe lixesha. Ukongeza, mhlawumbi ukusa kumkhamo othile kusetyenziswa ukufaka TIFF kakhulu enkulu, njengefama nohlelo.

Yintoni PNG-format

Namhlanje ngokubanzi kusetyenziswa iinguqulelo ezimbini algorithm. Kwimeko yangaphambili lisetyenziswa i-8-bit umbala palette, kunye yesibini - bit 24. Iifoto e PNG-8 format, xa kuthelekiswa GIF-uguqulelo yohlukile ngcono kancinci ucinezelo ratio kunye nokungabikho ukukwazi ukwenza iimposiso. Ngaphandle kwale mifanekiso singaqulatha ubuninzi imibala 256, le algorithm lisetyenziswa ukwenza lomzobo isicatshulwa, iilogo, imifanekiso elintlangothi ahlukile imifanekiso kunye elubala ithambeka. Kwiimeko apho le akwanelanga, abaphuhlisi basebenzisa bit-24 PNG-fomati, nto leyo eye kakhulu izibonelelo ezongezelelweyo, ezifana:

• algorithm ucinezelo Superior, leyo kunciphisa ababhangayo nayiphi na ilahleko yomgangatho.
• Ukukwazi ukusebenzisa alpha elubala ibonelela amanqanaba 256 ezahlukeneyo izinto elubala.
• Ubukho wesigrike, leyo ulungise ngokuzenzekelayo njengokukhazimla umfanekiso xa udlala kwiinkqubo ezahlukeneyo.
• Ukukwazi ukusebenzisa malunga 16.7 yezigidi imibala.

Konke oku kube lula PNG24 isicelo kunye ukuze compress nawuphi na umfanekiso equka izabelo neziselubala imizobo imibala ngakumbi ezibukhali lo mfanekiso.

uphuhliso mkhuba

Ngaphandle kwento yokuba ukusasazeka PNG-ifomathi kusekho ndinyanzelwe ngaphandle kwabakhangeli zincwadi abadala, kwakunye nenkxaso elanele engaphelelanga yale algorithm iimpawu iinguqulelo ezintsha, PNG lwemizobo web yi ethembisa kakhulu. Ethelekiswa GIF ngayo zinezibonelelo ezintathu ezinkulu: umjelo we-alpha, wesigrike kunye interlacing ezikumila kumacala mabini (a indlela imifanekiso ukubonisa progressive). Kwaye xa kuthelekiswa JPEG akukho ilahleko yomgangatho. Qaphela ukuba PNG-ifomati yaqanjwa NgoJanuwari 4, 1995. Ukususela ngoko sele kudlule iminyaka eli-18, yaye waba esikhokeleyo ukusetyenziswa websites, GIF ukutyhala zibe kwindawo yesibini. Uninzi siko software mifanekiso (umz MS Paint) namhlanje balamkela njengomgangatho yeefayile zokusindisa 'ngokungagqibekanga ". Mhlawumbi, ukuba akunjalo oopopayi kunye nemikhwa kwiinguqulelo abadala Internet Explorer, GIF ukunika indlela nembangi yayo ngaphambili.