I-Lossless vs Lossy Compression Icaciswe: IsiKhokelo esipheleleyo
Qonda umahluko osisiseko phakathi kweentlobo zoxinzelelo, ii-algorithms zazo, usetyenziso, kunye nendlela yokukhetha eyona ilungileyo kwiimfuno zakho ezithile.
Ukuqonda Uxinzelelo lweDatha
Ukunyanzeliswa kwedatha yindlela esisiseko kwi-teknoloji yedijithali enciphisa ubungakanani beefayile ngokuphelisa ukuphindaphinda kunye nokuhlaziya ulwazi. Njengoko ilizwe lethu ledijithali lisanda ngemifanekiso enesisombululo esiphezulu, iividiyo ze-4K, kunye nosetyenziso oluntsonkothileyo, ucinezelo olusebenzayo luba lubaluleke kakhulu kugcino lokugcinwa, ukuhanjiswa kwedatha ngokukhawuleza, kunye nokunciphisa ukusetyenziswa kwe-bandwidth.
Ii-algorithms zoxinzelelo ziwela kwiindidi ezimbini eziphambili: ngaphandle kwelahleko kwaye elahlekileyo. Ukuqonda umahluko phakathi kwezi ndlela kubalulekile ukwenza izigqibo ezinolwazi malunga nendlela yokugcina, ukuthumela, kunye nokusebenza ngedatha yedijithali kuzo zonke izicelo kunye namashishini.
Kutheni iCompression ibalulekile
Ukuqhambuka komxholo wedijithali kwenze ukucinezelwa kubaluleke ngakumbi kunangaphambili. Ukusuka kwiinkonzo zokusasaza ukuhambisa ividiyo ye-4K kwiifowuni eziphathwayo, ukuya kwiindawo zokugcina iifu ezihlala iibhiliyoni zeefayile, kwiiphequluli zewebhu ezilayisha amaphepha anzima kwii-millisecond-ubuchwepheshe boxinzelelo bunamandla angabonakaliyo okwenza ihlabathi lethu ledijithali lisebenze ngokufanelekileyo.
I-Lossless vs Lossy: Iiyantlukwano eziphambili
Uxinzelelo olungenakulahlekelwa
Ukwakhiwa ngokutsha okugqibeleleyo kwedatha yoqobo
Uxinzelelo oluLahlekileyo
Ukunciphisa idatha kunye nelahleko esemgangathweni eyamkelekileyo
Izigcina I-100% yedatha yoqobo. Xa ucinezelekile, isiphumo silingana nesuntswana kumthombo.
Isusa ngokusisigxina idatha ethathwa njengengabalulekanga kangako. I ifayile yoqobo ayinakufunyanwa kwakhona emva koxinzelelo.
Ngokuqhelekileyo uyaphumelela 2:1 ukusa kwese-5:1 imilinganiselo yoxinzelelo ngokuxhomekeke kuhlobo lwedatha. Unyinwe yimfuno yokugcina lonke ulwazi.
Inokufikelela kwireyishini ephezulu kakhulu, rhoqo 10:1 ukuya ku-100:1 okanye ngaphezulu, ngokulahla ulwazi “olungenamsebenzi”.
Okubhaliweyo, iinkqubo eziphunyeziweyo, oovimba beenkcukacha, imifanekiso yezonyango, ugcino lovimba, ukuqhutywa komsebenzi ngobungcali, nantoni na efuna ukwakhiwa ngokutsha okugqibeleleyo.
Iifoto, umculo, ukusasazwa kwevidiyo, imizobo yewebhu, kunye nezinye iinkqubo apho ukulahleka kwedatha kwamkelekile ngeenjongo ezisebenzayo.
Iyakwazi ukucinezela kwaye ithobe amaxesha amaninzi ngaphandle kokuthotywa. I-100th decompression iyafana neyoku-1.
Uncomo ngalunye luyazisa ilahleko yomgangatho owongezelelweyo. Le “lahleko yesizukulwana” iqokelelana kumjikelo ngamnye.
Ifuna ngokubanzi amandla amancinci okubala yokufakwa kwekhowudi/ukuguqula kuthelekiseke nelahleko ephucukileyo.
Iimfuno rhoqo izibonelelo ezininzi zokubala, ngakumbi kwii-algorithms ezintsonkothileyo njengeekhowudi zevidiyo.
Uxinzelelo olungenakulahlekelwa luchazwe
Yintoni iLossless Compression?
Ukunyanzeliswa kwe-Lossless kunciphisa ubungakanani befayile ngokuchonga kunye nokuphelisa ukuphindaphinda kwamanani ngaphandle kokususa naluphi na ulwazi. Xa icociwe, ifayile ifana kancinci neyokuqala, kwaye akukho lahleko kwaphela kumgangatho okanye imfezeko yedatha.
Indlela iCompression engaLahlekiyo isebenza ngayo
Ii-algorithms zokucinezela ezingenakulahlekelwa zisebenzisa iindlela ezahlukeneyo zokunciphisa ubungakanani befayile ngelixa uqinisekisa ukwakhiwa ngokutsha kwedatha yokuqala. Ezi ndlela zihlalutya iipateni, ii-frequencies, kunye nezakhiwo ngaphakathi kwedatha ukuyidibanisa ngokufanelekileyo ngaphandle kokulahlekelwa ulwazi.
UFakelo Lwekhowudi Yobude Bokubaleka (RLE)
I-RLE ithatha indawo yolandelelwano lwezinto ezifanayo zedatha (ibaleka) ngexabiso elinye nokubala. Umzekelo, “AAAAAABBBCCCCC” iba “6A3B5C”, inciphisa kakhulu ubungakanani bedatha ngokulandelelana okuphindaphindiweyo.
Original: WWWWWWWWWWBBBWWWWWWWWWWWWBBBWWWWWWWWWW Compressed: 10W3B12W3B10W
Huffman Coding
Obu buchule bunika iikhowudi zobude obuguquguqukayo kwiimpawu zongeniso, kunye neekhowudi ezimfutshane zoonobumba abaqhelekileyo. Le ndlela yokubala yenza ukuba ukhowudo lusekwe kunikezelo lwamaxesha oonobumba.
Frequent character 'e': 101 Less frequent 'z': 1010101011
LZ77 & LZ78 Algorithms
Ezi ndlela zisekwe kwisichazi-magama zithatha indawo yokwenzeka okuphindaphindiweyo kwedatha kunye neembekiselo kwikopi enye esele ikhona kumsinga ungaxinzelelwanga. Benza isiseko seefomati ezidumileyo njenge-ZIP kunye ne-GIF.
Instead of storing "compression compression" Store "compression [pointer to earlier instance]"
Deflate Algorithm
Ukudibanisa i-LZ77 kunye nekhowudi ye-Huffman, i-Deflate ibonelela ngoxinzelelo olubalaseleyo ngesantya esihle. Isetyenziswa kwi-ZIP, i-PNG, kunye noxinzelelo lwe-HTTP (gzip), iyenza ibe yenye yezona nkqubo zisasazwa kakhulu.
- I-ZIP egciniweyo
- Imifanekiso yePNG
- Uxinzelelo lweHTTP (gzip)
IKhowudi ye-Arithmetic
Obu buchwephesha bumele umyalezo njengoluhlu lwamanani phakathi kwe-0 kunye ne-1. Inokufikelela kwimilinganiselo yoxinzelelo kufutshane nomda we-entropy yethiyori, iyenze isebenze kakhulu kwiintlobo ezithile zedatha.
Ingakwazi ukufaka ikhowudi amasuntswana amaqhezu kwisimboli nganye, enikezela ngoxinzelelo olungcono kuneHuffman kwimithombo emininzi.
Ufakelo lweekhowudi kwiDelta
Endaweni yokugcina amaxabiso apheleleyo, i-delta encoding igcina umahluko phakathi kwamaxabiso alandelelanayo. Oku kusebenza ngokukodwa kwidatha apho amaxabiso akufutshane ayafana, njengesampulu zesandi okanye ufundo lwesivamvo.
Original: 105, 107, 106, 110, 108 Delta: 105, +2, -1, +4, -2
Iifomathi zeFayile eziLahlekileyo eziqhelekileyo
Oovimba
Imifanekiso
Umsindo
Ukunyanzeliswa kweLossy kuchazwe
Yintoni iLossy Compression?
Ukunyanzeliswa kwe-Lossy kunciphisa ubungakanani befayile ngokususa ngokusisigxina ulwazi oluthile, ngokukodwa idatha engafunekiyo okanye engabonakaliyo. Ifayile ye-decompressed ihluke kwi-original, kodwa ukungafani kwenzelwe ukuba kube nzima okanye akunakwenzeka ukuba abantu babone phantsi kweemeko eziqhelekileyo.
Isebenza njani iLossy Compression
Uxinzelelo olulahlekileyo lufezekisa umlinganiselo ophezulu kakhulu woxinzelelo ngokwenza izigqibo ezicwangcisiweyo malunga nokuba yeyiphi idatha ekufuneka ilahlwe. Ezi algorithms ziphakamisa ulwazi malunga nembono yomntu-into amehlo ethu kunye neendlebe zethu ezinokuzibona kwaye azikwazi ukuzibona-ukususa ulwazi ngeendlela zokunciphisa impembelelo ebonakalayo kumgangatho.
Guqula iKhowudi
Obu buchule buguqula idatha ukusuka kwindawo ethile (efana nendawo) ukuya kwenye (efana nefrikhwensi) apho ucinezelo lunokusetyenziswa ngokufanelekileyo. I-Discrete Cosine Transform (DCT) esetyenziswe kwiJPEG ngumzekelo obalaseleyo.
- Guqula iibhloko zemifanekiso zibe ngamacandelo amaza
- Nciphisa amacandelo aphezulu-frequency ngamandla ngakumbi
- Amehlo omntu akanovelwano kangako kula maza
Ubungakanani
I-Quantization inciphisa ukuchaneka kwamaxabiso edatha. Imaphu uluhlu lwamaxabiso egalelo kwiseti encinci yamaxabiso emveliso, inciphisa ngokufanelekileyo inani lamasuntswana afunekayo ukumela idatha.
Original values: 4.13, 4.28, 4.97, 4.02 Quantized to: 4, 4, 5, 4
IModeli yePsychoacoustic
Isetyenziswa kuxinzelelo lweaudio, obu buchule busebenzisa imida yokuva kwabantu. Ichonga ukuba ngawaphi amacandelo omsindo anokususwa ngaphandle kokuchaphazela umgangatho wesandi obonwayo.
- Isigqubuthelo sokuva: Izandi ezingxolayo imaski izandi ezolileyo
- Ubuzaza befrikhwensi: Abantu beva amaza aphakathi kuluhlu ngeyona ndlela
- Isigqubuthelo sexeshana: Izandi zinokugquma ezinye ezenzeka kamsinyane ngaphambi/emva koko
Ikhowudi yokuqonda
Ngokufana ne-psychoacoustic modeling kodwa kwidatha ebonakalayo, le ndlela isusa ulwazi olungenakubonwa ngamehlo abantu, ngokukodwa kwiinkcukacha eziphezulu kunye nokuhluka kombala.
Isetyenziswe kwiJPEG, MPEG, kunye neminye imigangatho yoxinzelelo olubonakalayo ukubeka phambili idatha ebalulekileyo yengqondo.
Imbuyekezo yentshukumo
Ubuchule bokucinezela ividiyo obusebenzisa ukungafuneki okwethutyana ngokufaka iikhowudi umahluko phakathi kwezakhelo kunesakhelo ngasinye esipheleleyo. Kuphela lutshintsho olusuka kwesinye isakhelo ukuya kwesinye lufakwe ngekhowudi ngokupheleleyo.
- Gcina “iifreyimu ezingundoqo” ezipheleleyo (ii-I-frames) ngamaxesha athile
- Kwezinye izakhelo, gcina kuphela umahluko (i-P-frames) okanye umahluko we-bidirectional (i-B-frames)
- Iziphumo kunciphiso olukhulu lwesayizi yefayile yevidiyo
Isampulu zeChroma
Obu buchule bunciphisa ulwazi lombala ngaphezu kolwazi oluqaqambileyo, lisebenzisa ithuba lokuqonda ngakumbi iliso lomntu ekukhanyeni kunokwahlukana kwemibala.
- 4:4:4 – Akukho samplings (umbala ogcweleyo)
- 4:2:2 – Iziqingatha zesisombululo sombala oxwesileyo
- 4:2:0 – Iziqingatha zombini ukusonjululwa kombala othe tye nothe nkqo
Iifomathi zeFayile eziLahlekileyo eziqhelekileyo
Imifanekiso
Umsindo
Ividiyo
Izicelo eziSebenzayo kunye neemeko zokuSebenzisa
Ukufota ngeDijithali
Uxinzelelo olungenakulahlekelwa
- Ukugcinwa kwefomathi eRAW kubafoti abaziingcali
- Ukugcinwa komgangatho wogcino lweefoto ezibalulekileyo
- Imifanekiso efuna ukuphuculwa okukhulu kwasemva kokwenziwa okanye ukuhlelwa
- Ifomati yePNG yemizobo enesicatshulwa okanye imiphetho ebukhali
Uxinzelelo oluLahlekileyo
- IJPEG yeefoto zemihla ngemihla kunye nokwabelana ngewebhu
- Ukuveliswa kwe-Thumbnail yeegalari kunye nomboniso
- Ukulayisha kwimidiya yoluntu apho imida yobungakanani iyasebenza
- Izihlomelo ze-imeyile kunye nezicelo zemiyalezo
Imveliso yomsindo
Uxinzelelo olungenakulahlekelwa
- Ukurekhoda okubalaseleyo kwizitudiyo (WAV, FLAC)
- Iingqokelela zomculo weAudiophile
- Ubunjineli bomsindo kunye nokuhlelwa kobuchule
- Ukugcinwa kweerekhodi ezibalulekileyo
Uxinzelelo oluLahlekileyo
- Iinkonzo zokusasaza (Spotify, Apple Music)
- Abadlali bomculo abaphathwayo abanokugcinwa okulinganiselweyo
- Irediyo ye-Intanethi kunye neepodcasts
- Umculo ongasemva weevidiyo kunye neentetho
Ukuveliswa kweVidiyo
Uxinzelelo olungenakulahlekelwa
- Iinkosi zeefilimu kunye nomabonwakude
- Izixhobo zomthombo weziphumo ezibonakalayo
- Umsebenzi worhwebo onexabiso eliphezulu
- Amaxwebhu evidiyo ezonyango nezenzululwazi
Uxinzelelo oluLahlekileyo
- Amaqonga okusasaza (Netflix, YouTube)
- Usasazo lukamabonakude
- Inkomfa ngevidiyo kunye neewebinars
- Iiklip zevidiyo zemidiya yoluntu
Uphuhliso lwewebhu
Uxinzelelo olungenakulahlekelwa
- I-PNG yeelogo, ii-iyikhoni, kunye nemizobo ecacileyo
- I-SVG yezinto zojongano olunokwehla
- IWebP ayinalahleko kwiigraphics ezinzima ezifuna umgangatho ogqibeleleyo
- Uxinzelelo lwe-asethi esekwe kwisicatshulwa (HTML, CSS, JavaScript)
Uxinzelelo oluLahlekileyo
- IJPEG okanye iWebP yeefoto kunye nemifanekiso enzima
- Ividiyo yeMP4 eneekhowudi ezifanelekileyo
- Umculo ongasemva kunye neziphumo zesandi
- Ukulayisha umfanekiso oqhubela phambili ukwenzela ukusebenza okubonwa ngokukhawuleza
Ugcino lweDatha kunye noLondolozo lweeNkcukacha eziBalulekileyo
Uxinzelelo olungenakulahlekelwa
- Ukugcinwa kwedatha yedatha kunye nokuthunyelwa ngaphandle
- Imithombo yekhowudi yokugcina
- Amaxwebhu agciniweyo (PDF, iifayile zeOfisi)
- Iirekhodi zoshishino ezibalulekileyo kunye namaxwebhu asemthethweni
Uxinzelelo oluLahlekileyo
- Ividiyo yokubeka iliso eneemfuno zomgangatho owamkelekileyo
- Imithombo yeendaba engabalulekanga apho ilahleko ethile yomgangatho yamkelekile
- Ugcino oluzenzekelayo lomxholo owenziwe ngumsebenzisi
- Idatha enkulu apho ukuthembeka okugqibeleleyo kungafunekiyo
Izicelo eziphathwayo
Uxinzelelo olungenakulahlekelwa
- Iifayile ezisebenzisekayo kunye nekhowudi
- Izinto ze-UI ezifuna umgangatho ogqibeleleyo
- Idatha yombhalo kunye noqwalaselo
- Ukugcinwa kwedatha ebalulekileyo yomsebenzisi
Uxinzelelo oluLahlekileyo
- Imifanekiso ye-app kunye nemizobo
- Izifundo zevidiyo kunye nemiboniso
- Izaziso zomsindo kunye neengoma zesandi
- Isiqulatho esigciniweyo ukuze sijongwe ngaphandle kweintanethi
Iintlobo zokuNxinzelela ngeFomathi yeFayile
Iifomathi ezahlukeneyo zefayile zisebenzisa iindlela zokucinezela ezithile ezilungiselelwe uhlobo lomxholo wazo. Ukuqonda ukuba zeziphi iifomati ezisebenzisayo zeziphi iindlela zokucinezela kukunceda wenze izigqibo ezingcono malunga nokugcina kunye nokwabelana ngomxholo wakho wedijithali.
| Ifomathi | Uhlobo | Indlela yokucinezela | Eyona iSetyenziselweyo | Umlinganiselo woxinzelelo |
|---|---|---|---|---|
| Iifomathi zoMfanekiso | ||||
| I-PNG | Ayinalahleko | Deflate (LZ77 + Huffman) | Imizobo, imifanekiso yesikrini, imifanekiso enesicatshulwa okanye ekuhleni | 1.5:1 ukuya ku-3:1 |
| JPEG | Ulahlekile | DCT, quantization | Iifoto, imifanekiso entsonkothileyo enokutshintsha kombala ogudileyo | 10:1 ukusa kwesama-20:1 |
| WebP | Umhlanganiselwa | Ikhowudi yokuqikelela (ilahleko), i-VP8 yangaphakathi-isakhelo (ilahleko) | Imizobo yewebhu, imifanekiso ephendulayo | Ilahleko: 25-35% encinci kuneJPEG I-Lossless: i-26% encinci kune-PNG |
| I-TIFF | Ayinalahleko | Ezahlukeneyo (LZW, ZIP, njl.) | Ukufota kobuchwephesha, ukuprinta, ukugcinwa kweenkcukacha ezibalulekileyo | 1.5:1 ukuya ku-3:1 |
| AVIF | Ulahlekile | AV1 ikhowudi ye-intra-frame | Imifanekiso yewebhu elandelayo, usetyenziso oluphambili | Ukuya kuthi ga kwi-50% encinci kuneJPEG |
| Iifomathi zomsindo | ||||
| MP3 | Ulahlekile | Imodeli ye-Psychoacoustic, i-MDCT | Umculo, iipodcasts, ukuphulaphula ngokubanzi | 10:1 ukusa kwese-12:1 |
| FLAC | Ayinalahleko | Uqikelelo lomgca, ikhowudi yerayisi | Iingqokelela zomculo weAudiophile, ugcino | 2:1 ukusa kwese-3:1 |
| I-AAC | Ulahlekile | Imodeli ye-psychoacoustic ephezulu | Usasazo lwedijithali, iinkonzo zokusasaza | Umgangatho ongcono kuneMP3 kwibitrate efanayo |
| Opus | Ulahlekile | SILK + CELT codecs | Unxibelelwano lwezwi, usetyenziso lwexesha langempela | Iphezulu kunezinye ii-codecs kwi-bitrate ephantsi |
| WAV | Ukungaxinzelelwanga | Akukho (ngokuqhelekileyo, nangona ucinezelo oluthile lunokwenzeka) | Ukurekhodwa kwestudio, iifayile zeaudio eziphambili | 1:1 (akukho kucinezelwa ngokungagqibekanga) |
| Iifomathi zeVidiyo | ||||
| H.264/AVC | Ulahlekile | Imbuyekezo yeMotion, DCT, CABAC/CAVLC | Ukusasaza, ukusasaza, ividiyo yedijithali | 50:1 ukuya 100:1 |
| H.265 / HEVC | Ulahlekile | Uqikelelo lwentshukumo olukwinqanaba eliphezulu, iibhloko zekhowudi ezinkulu | Umxholo we-4K/8K, ukusasazwa kobuchule obuphezulu | I-25-50% ingcono kune-H.264 |
| AV1 | Ulahlekile | Uqikelelo oluntsonkothileyo kunye nokuguqula iikhowudi | Ukusasazwa kwesizukulwana esilandelayo, usetyenziso olungahlawulelwayo | I-30% ingcono kune-HEVC |
| IiProRes | Ulahlekile (ubonakala engenalahleko) | I-intraframe esekwe kwi-DCT | Ukuhlelwa kwevidiyo, emva kokuveliswa | 5:1 ukuya 10:1 (kuxhomekeke kukwahluka) |
| FFV1 | Ayinalahleko | Iikhowudi zeGolomb-Rice, imodeli yomxholo | Ukugcinwa kwevidiyo, ukugcinwa | 2:1 ukusa kwese-3:1 |
| Iifomathi zoxwebhu | ||||
| Umhlanganiselwa | Deflate (umbhalo), JPEG/JBIG2 (imifanekiso) | Ukuhanjiswa kwamaxwebhu, iifom, upapasho | Iyahluka ngokubanzi ngomxholo | |
| DOCX/XLSX | Ayinalahleko | I-ZIP (engundoqo), ezahlukeneyo kwizinto ezifakwe | Amaxwebhu eofisi, iispreadsheets | 1.5:1 ukuya ku-3:1 |
| EPUB | Umhlanganiselwa | ZIP (isikhongozeli), ezahlukeneyo imixholo | Iincwadi ze-E, iimpapasho zedijithali | Kuxhomekeke kuhlobo lomxholo |
| Iifomathi zoovimba | ||||
| ZIP | Ayinalahleko | Deflate (LZ77 + Huffman) | Ukugcinwa kweefayile ngokubanzi, ukuhambelana kweqonga elinqamlezileyo | 2:1 ukuya 10:1 (kuxhomekeke kumxholo) |
| 7Z | Ayinalahleko | LZMA, LZMA2, PPMd, njl. | Iimfuno zoxinzelelo oluphezulu | I-30-70% ingcono kune-ZIP |
| I-RAR | Ayinalahleko | I-algorithm yobunikazi | Uxinzelelo oluphezulu kunye nezixhobo zobunini | I-10-30% ingcono kune-ZIP |
Ulukhetha njani uhlobo oluLungileyo lokuNxinzelela
Ngaba ukwakhiwa ngokutsha okugqibeleleyo kwedatha yoqobo kubalulekile?
Ngaba imiqobo yokugcina okanye umda we-bandwidth yinkxalabo ebalulekileyo?
Ngaba umxholo uza kuphinda uhlelwe okanye uqwalaselwe?
IiNgcebiso eziGqwesileyo zeQhinga lokuNxinzelela
- Gcina iinkosi zoqobo kunye noxinzelelo olungenakulahleka okanye kwifomati engaxinzelelwanga nanini na kunokwenzeka. Ezi zisebenza njenge “negatives” zakho zedijithali.
- Yenza iinguqulelo ezilahlekileyo zokusasazwa kunye nokwabelana ukulinganisa umgangatho kunye nobukhulu befayile ngokusekelwe kusetyenziso olujoliswe kuyo.
- Cinga ngendlela enemigangatho ngamanqanaba oxinzelelo ahlukeneyo ngeenjongo ezahlukeneyo (ugcino, iifayile zokusebenza, ukuhanjiswa).
- Vavanya useto loxinzelelo olwahlukileyo ukufumana ibhalansi efanelekileyo phakathi kobungakanani befayile kunye nomgangatho womxholo wakho othile.
- Hlala unolwazi malunga netekhnoloji entsha yoxinzelelo njengoko banokubonelela ngophuculo olubonakalayo ekusebenzeni kakuhle kunye nomgangatho.
- Bhala inkqubo yakho yoxinzelelo ukuqinisekisa ukuhambelana kunye nokwenza lula ulawulo lwefayile kwixesha elizayo.
Imibuzo ebuzwa qho
Ngaba unokuguqula phakathi koxinzelelo olungenalahleko kunye nelahleko?
Unokuhlala uguqula ukusuka kwifomati engalahlekanga ukuya kwelahlekileyo, kodwa umva akunakwenzeka ngokwenene. Nje ukuba ulwazi lulahlwe kuxinzelelo lwelahleko, alunakufunyanwa kwakhona. Ukuguqula ukusuka kwifomathi elahlekileyo ukuya kwilahleko kuya kugcina ifayile kwimeko yayo yangoku (kubandakanywa nayiphi na ilahleko yekhwalithi), kodwa ayiyi kubuyisela idatha yoqobo eyasuswa ngexesha lokunyanzeliswa kwelahleko yokuqala.
Ngaba ucinezelo lonakalisa iifayile okanye uzenze zingazinzi?
Ukunyanzeliswa kweLossless akuze konakalise iifayile-ngenkcazo, ifayile ethotyiweyo iyafana neyokuqala. Uxinzelelo olulahlekileyo lususa idatha ngokusisigxina, kodwa oku kuyilo kwaye kujolise kulwazi olunempembelelo encinci yokuqonda. Ngokubhekiselele kuzinzo, iifayile ezicinezelwe ngokufanelekileyo azihlali ngaphantsi kunezo zingaxinzelelwanga. Nangona kunjalo, ezinye iifayile ezicinezelekileyo zinokuba sesichengeni sorhwaphilizo, njengoko impazamo encinci inokuchaphazela idatha eninzi xa ulwazi lupakishwe ngokuxinana.
Kutheni umntu ukukhetha ucinezelo ilahleko ukuba isusa data?
Ukunyanzeliswa okulahlekileyo kunika imilinganiselo yoxinzelelo olungcono kakhulu kuneendlela ezingalahlekiyo, amaxesha amaninzi amaxesha angama-10-100 amancinci. Oku kwenza ukuba kube yinto esebenzayo kwizicelo apho ubungakanani befayile, i-bandwidth, okanye imiqobo yokugcina izinto ezibalulekileyo. Ukuqonda okuphambili kukuba ukunyanzeliswa kwelahleko kuyilelwe ukususa ulwazi abantu abangafane baluqaphele okanye olunempembelelo encinci kumgangatho ocingelwayo. Kwizicelo ezininzi-njengomculo wokusasaza, ukwabelana ngeefoto, okanye ukubukela iividiyo-urhwebo phakathi kokuncitshiswa okuncinci kumgangatho wobugcisa kunye nokuncipha okukhulu kobungakanani befayile kuluncedo kakhulu.
Uxinzelelo luyichaphazela njani i-SEO yemifanekiso kwiiwebhusayithi?
Ukunyanzeliswa komfanekiso kuchaphazela kakhulu i-SEO ngesantya somthwalo wephepha, eyona nto iphambili yokubeka iinjini zokukhangela. Imifanekiso exinaniswe ngokufanelekileyo inciphisa ubunzima bephepha kwaye iphucule amaxesha okulayisha, okukhokelela kumatriki amava omsebenzisi angcono kunye namazinga aphezulu okukhangela. Ngelixa ukunyanzeliswa kwelahleko ngokuqhelekileyo kunika ukunciphisa ubungakanani obungcono, isitshixo kukufumana ibhalansi efanelekileyo-imifanekiso kufuneka ixinzelelwe ngokwaneleyo ukuba ilayishe ngokukhawuleza kodwa igcine umgangatho owaneleyo wokubandakanya abasebenzisi kunye nokudlulisa ulwazi ngokufanelekileyo. Iifomathi zanamhlanje ezifana neWebP zibonelela ngoxinzelelo olubalaseleyo ngomgangatho olungileyo, kwaye ukuphumeza imifanekiso ephendulayo iqinisekisa ukuhanjiswa kwezixhobo kuzo zonke izixhobo.
Ngaba kukho indlela yoxinzelelo esebenza kakuhle kuzo zonke iintlobo zedatha?
Akukho ndlela enye yocinezelo esebenza ngokufanelekileyo kuzo zonke iindidi zedatha. Iindidi ezahlukeneyo zomxholo zineepropati ezahlukeneyo zezibalo kunye nokuphindaphinda okungasetyenziswa. Umbhalo ucinezela ngokwahlukileyo kwimifanekiso, ecinezela ngokwahlukileyo kwiaudio okanye ividiyo. Nangaphakathi kodidi olufana nemifanekiso, ifoto enombala ogudileyo ijika icinezele ngokwahlukileyo kunomzobo obukhali onemibala enyiniweyo. Kungenxa yoko le nto iifomati ezikhethekileyo zikhona kwiindidi ezahlukeneyo zomxholo, kwaye kutheni izixhobo zangoku zokucinezela zihlala zihlalutya umxholo ukuze zisebenzise eyona algorithm isebenzayo kwipateni nganye yedatha.
Ndazi njani ukuba ndisebenzisa inqanaba loxinzelelo elilungileyo?
Ukufumana inqanaba loxinzelelo oluchanekileyo kufuna ukulungelelanisa izinto ezintathu: ubungakanani befayile, umgangatho, kunye nexesha lokucubungula. Ukunyanzeliswa kwelahleko, qhuba iimvavanyo ezibonakalayo okanye zokuva ukujonga indawo apho ukuncitshiswa komgangatho kubonakala kumxholo wakho kunye nabaphulaphuli. Uxinzelelo olungenalahleko, thelekisa ii-algorithms ezahlukeneyo ukuze ufumane olona nciphiso lobungakanani bohlobo lwakho lwedatha. Izicelo ezininzi zibonelela ngamanqanaba oxinzelelo olucwangcisiweyo (umzekelo, ophantsi, ophakathi, aphezulu), obonelela ngamanqaku okuqalisa alungileyo. Soloko uvavanya imveliso ecinezelweyo kwimeko-bume ecetyiweyo-isicwangciso soxinzelelo esijongeka silungile kumatshini wakho wophuhliso sisenokungabi silungileyo kwizixhobo ezahlukeneyo okanye phantsi kweemeko ezahlukeneyo zokujonga.
Ngaba ukucinezela iifayile amaxesha amaninzi kubangela ilahleko eyongezelelweyo yomgangatho?
Ukunyanzeliswa okungalahlekiyo, ukunyanzeliswa okuphindaphindiweyo kunye nemijikelezo ye-decompression ayinayo impembelelo kumgangatho-ifayile ihlala ifana neyokuqala. Ukunyanzeliswa kwelahleko, umjikelo ngamnye omtsha wokunyanzeliswa uzisa ilahleko eyongezelelweyo yekhwalithi, eyaziwa ngokuba “yilahleko yesizukulwana.” Oku kuyingxaki ngakumbi xa usebenzisa ii-algorithms ezahlukeneyo okanye useto kwizizukulwana ngezizukulwana. Umzekelo, ukuhlela ngokuphindaphindiweyo kunye nokugcina umfanekiso weJPEG kuya kuthoba kancinci umgangatho wawo. Ukunciphisa ilahleko yesizukulwana, hlala usebenza ukusuka kweyona fayile yomthombo womgangatho ophezulu okhoyo, kwaye ugcine umsebenzi ophakathi kwiifomathi ezilahlekileyo ngexesha leenkqubo zokuhlela.
Yenza iZigqibo zoQhagamshelwano ezinolwazi
Ukuqonda umahluko phakathi koxinzelelo olungenalahleko kunye nelahleko kukunceda ukwandise ukuhamba komsebenzi wakho wedijithali, ugcine indawo yokugcina, kwaye uqinisekise ukuba umxholo wakho ugcina umgangatho ofanelekileyo wokusetyenziswa ekujoliswe kuwo.