Lossless vs Lossy Compression E hlalositsoe: Tataiso e Felletseng
Utloisisa phapang ea mantlha lipakeng tsa mefuta ea khatello, li-algorithms tsa bona, lits’ebetso, le mokhoa oa ho khetha e nepahetseng bakeng sa litlhoko tsa hau tse ikhethileng.
Ho utloisisa Compression Data
Khatello ea data ke mokhoa oa mantlha oa theknoloji ea dijithale o fokotsang boholo ba lifaele ka ho felisa bofokoli le ho hlophisa bocha tlhahisoleseling. Ha lefatÅ¡e la rona la dijithale le ntse le hola ka litÅ¡oantÅ¡o tse nang le liqeto tse phahameng, livideo tsa 4K, le lits’ebetso tse rarahaneng, khatello e sebetsang e ntse e ba ea bohlokoa haholo bakeng sa ntlafatso ea polokelo, phetiso ea data e potlakileng, le tÅ¡ebeliso e fokotsehileng ea bandwidth.
Li-algorithms tsa compression li arotsoe ka mekhahlelo e ‘meli ea mantlha: e hlokang tahlehelo le lahleheloang. Ho bohlokoa ho utloisisa phapang lipakeng tsa mekhoa ena bakeng sa ho etsa liqeto tse nang le tsebo mabapi le ho boloka, ho fetisa, le ho sebetsa ka data ea dijithale lits’ebetsong le liindasteri tse fapaneng.
Ke Hobane’ng ha Compression e le Bohlokoa?
Ho phatloha ha litaba tsa dijithale ho entse hore compression e be bohlokoa ho feta leha e le neng pele. Ho tloha lits’ebeletso tsa ho phallela ho fana ka video ea 4K ho lithelefono tsa thelefono, ho ea ho li-platform tsa polokelo ea maru ho boloka libilione tsa lifaele, ho libatli tsa marang-rang tse kenyang maqephe a rarahaneng ka li-milliseconds-theknoloji ea compression ke matla a sa bonahaleng a etsang hore lefatÅ¡e la rona la digital le sebetse hantle.
Lossless vs Lossy: Liphapang tsa Bohlokoa
Khatello e sa Lahleheng
Ntlafatso e phethahetseng ea data ea mantlha
Khatello e Lahlehileng
Phokotso ea data ka tahlehelo ea boleng bo amohelehang
E baballang 100% ea data ea mantlha. Ha decompressed, sephetho se batla se tšoana le mohloli.
E tlosa ka ho sa feleng data eo ho nkoang e se ea bohlokoa hakaalo. The faele ea mantlha e ke ke ea fumanoa ka ho phethahetseng ka mor’a ho hatella.
Ka tloaelo e finyella 2:1 ho ea ho 5:1 compression ratios ho itšetlehile ka mofuta oa data. E lekanyelitsoe ke tlhoko ea ho boloka tlhahisoleseling eohle.
E ka finyella litekanyetso tse phahameng haholo, hangata 10:1 ho isa ho 100:1 kapa ho feta, ka ho lahla tlhahisoleseling “e sa hlokeng letho”.
Mongolo, mananeo a ka sebetswang, datha, ditshwantsho tsa bongaka, polokelo ya dipolokelo, tswelopele ya mosebetsi ya profeshenale, eng kapa eng e hlokang tokiso e phethahetseng.
Linepe, ‘mino, ho phallela video, litÅ¡oantÅ¡o tsa webo, le lits’ebetso tse ling moo tahlehelo ea data e amohelehang molemong oa ts’ebetso.
E khona ho hatella le ho senya makhetlo a mangata ntle le ho senyeha. The decompression ea bo-100 e ts’oana le ea pele.
Recompression e ‘ngoe le e ‘ngoe e ea hlahisa tahlehelo ea boleng bo eketsehileng. “Tahlehelo ea moloko” e bokellana le potoloho ka ‘ngoe.
Ka kakaretso e hloka matla a fokolang a ho bala bakeng sa khouto/decoding bapisoa le litahlehelo tse tsoetseng pele tsa tahlehelo.
Hangata litlhoko lisebelisoa tse ngata tsa computational, haholo-holo bakeng sa li-algorithms tse tsoetseng pele joalo ka li-codec tsa video.
Khatello e sa Lahleheng e hlalositsoe
Lossless Compression ke eng?
Khatello e se nang tahlehelo e fokotsa boholo ba faele ka ho tsebahatsa le ho felisa boteng ba lipalo ntle le ho tlosa tlhahisoleseling. Ha e fokotsehile, faele e batla e tÅ¡oana le ea pele, ‘me ha e na tahlehelo ea boleng kapa botÅ¡epehi ba data.
Kamoo Khatello e sa Lahleheng e Sebetsang Kateng
Li-algorithms tse se nang tahlehelo tsa compression li sebelisa mekhoa e fapaneng ho fokotsa boholo ba faele ha li ntse li netefatsa ntlafatso e phethahetseng ea data ea mantlha. Mekhoa ena e sekaseka lipaterone, maqhubu le meaho ka har’a data ho e kenyelletsa ka mokhoa o atlehileng ntle le ho lahleheloa ke tlhahisoleseling.
Khouto ea Length-Length (RLE)
RLE e nkela sebaka sa tatellano ea likarolo tse ts’oanang tsa data (e matha) ka boleng bo le bong le palo. Mohlala, “AAAAAABBBCCCCC” e fetoha “6A3B5C”, e fokotsa haholo boholo ba data ka tatellano e pheta-phetoang.
Original: WWWWWWWWWWBBBWWWWWWWWWWWWBBBWWWWWWWWWW Compressed: 10W3B12W3B10W
Huffman Coding
Mokhoa ona o fana ka likhoutu tsa bolelele bo feto-fetohang ho litlhaku tse kentsoeng, ka likhoutu tse khuts’oane bakeng sa litlhaku tse khafetsa. Mokhoa ona oa lipalo-palo o ntlafatsa khouto ho ipapisitsoe le phetisetso ea makhetlo a litlhaku.
Frequent character 'e': 101 Less frequent 'z': 1010101011
LZ77 & LZ78 Algorithms
Mekhoa ena e thehiloeng ho dikishinari e nka sebaka sa ho hlaha khafetsa ha data ka litÅ¡upiso tsa kopi e le ‘ngoe e seng e ntse e le teng molatsoaneng o sa hatelloang. Ba theha motheo oa lifomate tse tsebahalang joalo ka ZIP le GIF.
Instead of storing "compression compression" Store "compression [pointer to earlier instance]"
Fetola algorithm
Ho kopanya LZ77 le Huffman coding, Deflate e fana ka compression e babatsehang ka lebelo le letle. E sebelisoa ho compression ea ZIP, PNG, le HTTP (gzip), e e etsa e ‘ngoe ea li-algorithms tse sebelisoang haholo.
- Li-archives tsa ZIP
- Litšoantšo tsa PNG
- Khatello ea HTTP (gzip)
Likhoutu tsa Arithmetic
Mokhoa ona o emela molaetsa e le palo ea linomoro pakeng tsa 0 le 1. E ka finyella litekanyetso tsa compression haufi le moeli oa theoretical entropy, e leng se etsang hore e sebetse haholo bakeng sa mefuta e itseng ea data.
E ka kenyelletsa likaroloana tsa likaroloana ka letšoao, e fana ka compression e betere ho feta Huffman bakeng sa mehloli e mengata.
Delta Encoding
Sebakeng sa ho boloka boleng bo felletseng, khouto ea delta e boloka liphapang lipakeng tsa litekanyetso tse latellanang. Sena se sebetsa haholo bakeng sa data moo boleng ba haufi bo ts’oanang, joalo ka lisampole tsa molumo kapa ‘malo oa sensor.
Original: 105, 107, 106, 110, 108 Delta: 105, +2, -1, +4, -2
Tloaelehileng Lossless File Formats
Archives
Litšoantšo
Audio
Khatello e Lahlehileng e hlalositsoe
Lossy Compression ke eng?
Khatello ea tahlehelo e fokotsa boholo ba faele ka ho tlosa tlhahisoleseling e itseng ka ho sa feleng, haholo-holo data e sa hlokahaleng kapa e sa bohlokoa haholo. Faele e senyehileng e fapane le ea pele, empa liphapang li etselitsoe ho ba thata kapa ho ke ke ha khoneha hore batho ba lemohe tlas’a maemo a tloaelehileng.
Kamoo Lossy Compression e Sebetsang Kateng
Khatello ea tahlehelo e fihlella maemo a holimo haholo a khatello ka ho etsa liqeto tsa maano mabapi le hore na u lahle data efe. Litaolo tsena li phahamisa tsebo mabapi le maikutlo a batho – seo mahlo a rona le litsebe tsa rona li ka se khonang le tseo re ke keng ra li lemoha – ho tlosa tlhahisoleseling ka litsela tse fokotsang tÅ¡usumetso e hlokomelehang boleng.
Fetola Coding
Mokhoa ona o fetola data ho tloha sebakeng se seng (joaloka sebaka) ho ea ho se seng (joaloka khafetsa) moo khatello e ka sebelisoang ka katleho. Discrete Cosine Transform (DCT) e sebelisitsoeng ho JPEG ke mohlala o ka sehloohong.
- Fetolela li-block blocks ho likarolo tsa frequency
- Fokotsa likarolo tsa maqhubu a holimo ka mokhoa o matla haholoanyane
- Mahlo a batho ha a utloele maqhubu ana
Quantization
Quantization e fokotsa ho nepahala ha boleng ba data. E etsa ‘mapa oa mefuta e mengata ea litekanyetso ho sehlopha se senyenyane sa boleng ba lihlahisoa, ka katleho e fokotsa palo ea li-bits tse hlokahalang ho emela lintlha.
Original values: 4.13, 4.28, 4.97, 4.02 Quantized to: 4, 4, 5, 4
Mohlala oa Psychoacoustic
E sebelisoa ha ho hatelloa ka molumo, mokhoa ona o sebelisa mefokolo ea kutlo ea batho. E supa hore na ke likarolo life tsa molumo tse ka tlosoang ntle le ho ama boleng ba molumo o lemohuoang.
- Masking ea kutlo: Melumo e phahameng e utloahala e khutsitse
- Kutloisiso ea khafetsa: Batho ba utloa maqhubu a mahareng hantle ka ho fetesisa
- Masking ea nakoana: Melumo e ka pata tse ling tse etsahalang nakoana pele / kamora
Perceptual Coding
Joalo ka mohlala oa psychoacoustic empa bakeng sa data e bonoang, mokhoa ona o tlosa tlhahisoleseling eo mahlo a motho a ke keng a e hlokomela, haholo-holo ka lintlha tse phahameng tsa maqhubu le phapang ea mebala.
E sebelisoa ho JPEG, MPEG, le litekanyetso tse ling tsa khatello ea pono ho beha data ea bohlokoa pele.
Matšeliso a Motion
Mokhoa oa compression oa video o sebelisang bofokoli ba nakoana ka ho kenyelletsa liphapang lipakeng tsa liforeimi ho fapana le foreimi e ngoe le e ngoe e felletseng. Ke feela liphetoho ho tloha foreiming e ‘ngoe ho ea ho e ‘ngoe tse kentsoeng ka botlalo.
- Boloka “li-keyframes” tse felletseng (I-frames) nako le nako
- Bakeng sa liforeimi tse ling, boloka feela liphapang (P-frames) kapa liphapang tsa mahlakore a mabeli (B-frames)
- Liphetho tsa phokotso ea boholo ba lifaele tsa video
Mohlala o monyenyane oa Chroma
Mokhoa ona o fokotsa tlhahisoleseding ea mebala ho feta boitsebiso bo khanyang, o nka monyetla oa ho utloisisa ha leihlo la motho ho khanya ho feta ho se tšoane ha mebala.
- 4:4:4 – Ha ho sampling (‘mala o felletseng)
- 4:2:2 – Halofo e tshekaletseng ya mebala e nang le qeto
- 4:2:0 – Halofo ka bobeli e tÅ¡ekaletseng le e theohileng ka mebala e nang le qeto
Tloaelehileng Lossy File Formats
Litšoantšo
Audio
Video
Lisebelisoa tse Sebetsang le Maemo a TÅ¡ebeliso
Litšoantšo tsa Dijithale
Khatello e sa Lahleheng
- Tlhokomelo ea sebopeho sa RAW bakeng sa lifoto tsa litsebi
- Polokelo ea boleng ba polokelo ea linepe tsa bohlokoa
- Litšoantšo tse hlokang ho hlophisoa kapa ho hlophisoa ha nako e telele
- Sebopeho sa PNG bakeng sa litšoantšo tse nang le mongolo kapa mahlakore a bohale
Khatello e Lahlehileng
- JPEG bakeng sa linepe tsa letsatsi le letsatsi le ho arolelana marang-rang
- Ho hlahisa li-thumbnail bakeng sa li-galleries le ponelo-pele
- Li-social media tse kentsoeng moo ho nang le meeli ea boholo
- Lihokelo tsa lengolo-tsoibila le lits’ebetso tsa melaetsa
Tlhahiso ea Audio
Khatello e sa Lahleheng
- Lirekoto tse hloahloa ho li-studio (WAV, FLAC)
- Lipokello tsa ‘mino oa Audiophile
- Boenjiniere ba molumo le bohlophisi ba litsebi
- Khatiso ea lirekoto tsa bohlokoa
Khatello e Lahlehileng
- Litšebeletso tsa ho phallela (Spotify, Apple Music)
- Libapali tsa ‘mino tse nkehang habonolo tse nang le polokelo e fokolang
- Marang-rang le li-podcasts
- ‘Mino oa bokamorao bakeng sa livideo le linehelano
Tlhahiso ea Lifitio
Khatello e sa Lahleheng
- Litsebi tsa tlhahiso ea lifilimi le TV
- Lisebelisoa tsa mohloli oa litlamorao tse bonoang
- Mosebetsi oa khoebo o nang le chelete e ngata
- Litokomane tsa video tsa bongaka le tsa saense
Khatello e Lahlehileng
- Li-platform tsa ho phallela (Netflix, YouTube)
- Phatlalatsa thelevishene
- Likopano tsa video le li-webinars
- Likotwana tsa video tsa media media
Ntlafatso ea Marang-rang
Khatello e sa Lahleheng
- PNG bakeng sa li-logo, li-icon le litšoantšo tse pepeneneng
- SVG bakeng sa likarolo tsa scalable interface
- WebP ha e na tahlehelo bakeng sa litšoantšo tse rarahaneng tse hlokang boleng bo phethahetseng
- Khatello ea thepa e thehiloeng ho mongolo (HTML, CSS, JavaScript)
Khatello e Lahlehileng
- JPEG kapa WebP bakeng sa linepe le litšoantšo tse rarahaneng
- Video ea MP4 e nang le li-codec tse nepahetseng
- ‘Mino oa bokamorao le litlamorao tsa molumo
- Ts’ebetso e tsoelang pele ea ho kenya litÅ¡oantÅ¡o bakeng sa ts’ebetso e lemohuoang kapele
Polokelo ea Boitsebiso & Ho Boloka
Khatello e sa Lahleheng
- Database backups le diyantle
- Libaka tsa polokelo ea khoutu ea mohloli
- Litokomane tsa litokomane (PDF, lifaele tsa Ofisi)
- Litlaleho tsa bohlokoa tsa khoebo le litokomane tsa molao
Khatello e Lahlehileng
- Video ea leihlo e nang le litlhoko tsa boleng bo amohelehang
- Li-archive tsa mecha ea phatlalatso e seng ea bohlokoa moo tahlehelo e itseng ea boleng e amohelehang
- Li-backups tsa litaba tse hlahisoang ke basebelisi
- Lintlha tse kholo moo botšepehi bo phethahetseng bo sa hlokeng
Lisebelisoa tsa Mobile
Khatello e sa Lahleheng
- Lifaele le khoutu tse sebetsang tse ka sebelisoang
- Lintlha tsa UI tse hlokang boleng bo phethahetseng
- Lintlha tsa mongolo le litlhophiso
- Li-backups tsa data tsa bohlokoa tsa basebelisi
Khatello e Lahlehileng
- LitÅ¡oantÅ¡o tse ka har’a app le likhalase
- Lithuto tsa video le lipontšo
- Litsebiso tsa molumo le lipina tsa molumo
- Likahare tse bolokiloeng hore li bonoe ntle le inthanete
Mefuta ea Khatello ka Sebopeho sa Faele
Mefuta e fapaneng ea lifaele e sebelisa mekhoa e ikhethileng ea compression e ntlafalitsoeng bakeng sa mofuta oa litaba tsa bona. Ho utloisisa hore na ke lifomate life tse sebelisang mekhoa ea compression ho u thusa ho etsa liqeto tse betere mabapi le ho boloka le ho arolelana litaba tsa hau tsa dijithale.
| Sebopeho | Mofuta | Mokhoa oa ho hatella | Molemo ka ho Fetisisa E Sebelisitsoeng | Compression ratio |
|---|---|---|---|---|
| Libopeho tsa Litšoantšo | ||||
| PNG | E hlokang tahlehelo | Deflate (LZ77 + Huffman) | Litšoantšo, linepe, litšoantšo tse nang le mongolo kapa pepeneneng | 1.5:1 ho ea ho 3:1 |
| JPEG | Lahleheloa | DCT, quantization | Lifoto, litšoantšo tse rarahaneng tse nang le phetoho e boreleli ea mebala | 10:1 ho ea ho 20:1 |
| WebP | Hybrid | Predictive coding (tahlehelo), VP8 intra-frame (e sa lahleheloeng) | Litšoantšo tsa marang-rang, litšoantšo tse arabelang | Lahlehelo: 25-35% e nyane ho feta JPEG Tahlehelo: 26% e nyane ho feta PNG |
| TIFF | E hlokang tahlehelo | Tse fapaneng (LZW, ZIP, joalo-joalo) | Ho nka lifoto tsa litsebi, ho hatisa, ho boloka litlaleho | 1.5:1 ho ea ho 3:1 |
| AVIF | Lahleheloa | Khoutu ea ka hare ho AV1 | LitÅ¡oantÅ¡o tsa marang-rang tsa mofuta o latelang, lits’ebetso tse tsoetseng pele | Ho fihla ho 50% e nyane ho feta JPEG |
| Lisebelisoa tsa Audio | ||||
| MP3 | Lahleheloa | Mohlala oa Psychoacoustic, MDCT | ‘Mino, li-podcasts, ho mamela ka kakaretso | 10:1 ho ea ho 12:1 |
| FLAC | E hlokang tahlehelo | Ho bolela esale pele ka mola, khouto ea Rice | Lipokello tsa ‘mino oa Audiophile, ho boloka boitsebiso | 2:1 ho ea ho 3:1 |
| AAC | Lahleheloa | Mohlala o tsoetseng pele oa psychoacoustic | Khaso ea dijithale, lits’ebeletso tsa ho phallela | Boleng bo betere ho feta MP3 ka bitrate e ts’oanang |
| Opus | Lahleheloa | SILK + CELT codecs | Puisano ea lentsoe, lisebelisoa tsa nako ea sebele | E phahame ho feta li-codec tse ling ka li-bitrate tse tlase |
| WAV | E sa hatelloang | Ha ho na (hangata, le hoja khatello e itseng e khoneha) | Ho rekota setudio, lifaele tsa audio tse hloahloa | 1: 1 (ha ho compression ka kamehla) |
| Liforomo tsa Video | ||||
| H.264/AVC | Lahleheloa | Motion puseletso, DCT, CABAC/CAVLC | Ho phallela, ho phatlalatsa, video ea digital | 50:1 ho isa ho 100:1 |
| H.265/HEVC | Lahleheloa | Polelo e tsoetseng pele ea motsamao, li-blocks tse kholoanyane tsa likhoutu | Likahare tsa 4K/8K, phallo e sebetsang hantle haholo | 25-50% e betere ho feta H.264 |
| AV1 | Lahleheloa | Ho bolela esale pele le ho fetola likhoutu | Meloko e latelang ea ho phallela, lits’ebetso tse sa lefelloeng | 30% e betere ho feta HEVC |
| ProRes | Lahleheloa (ka ponahalo ha e lahlehe) | Intraframe e thehiloeng ho DCT | Ho hlophisa livideo, tlhahiso ea morao-rao | 5:1 ho ya ho 10:1 (ho itshetlehile ka phapang) |
| FFV1 | E hlokang tahlehelo | Likhoutu tsa Golomb-Rice, mohlala oa maemo | Ho boloka livideo, ho boloka | 2:1 ho ea ho 3:1 |
| Liforomo tsa Litokomane | ||||
| Hybrid | Deflate (mongolo), JPEG/JBIG2 (litšoantšo) | Kabo ea litokomane, liforomo, lingoliloeng | E fapana haholo ho latela litaba | |
| DOCX/XLSX | E hlokang tahlehelo | ZIP (konokono), tse fapaneng bakeng sa lintho tse kentsoeng | Litokomane tsa ofisi, li-spreadsheet | 1.5:1 ho ea ho 3:1 |
| EPUB | Hybrid | ZIP (setshelo), tse fapaneng bakeng sa litaba | E-books, lingoliloeng tsa digital | E ipapisitse le mofuta oa litaba |
| Liforomo tsa Archive | ||||
| ZIP | E hlokang tahlehelo | Deflate (LZ77 + Huffman) | Kakaretso faele archiving, cross-platform tshebeletsano | 2:1 ho ya ho 10:1 (ho itshetlehile ka dikahare) |
| 7Z | E hlokang tahlehelo | LZMA, LZMA2, PPMd, joalo-joalo. | Litlhoko tsa khatello e phahameng | 30-70% e betere ho feta ZIP |
| RAR | E hlokang tahlehelo | Proprietary algorithm | Khatello e phahameng ka ho fetisisa e nang le lisebelisoa tsa thepa | 10-30% e betere ho feta ZIP |
Mokhoa oa ho khetha mofuta o nepahetseng oa compression
Na tokiso e phethahetseng ea data ea mantlha ke ea bohlokoa?
Na lithibelo tsa polokelo kapa meeli ea bandwidth ke lintho tse amehang haholo?
Na litaba li tla tsoela pele ho hlophisoa kapa ho sebetsa?
Mekhoa e Molemohali ea Leano la Compression
- Boloka li-masters tsa mantlha tse nang le khatello e se nang tahlehelo kapa ka sebopeho se sa hatellehang neng kapa neng ha ho kgoneha. Tsena li sebetsa e le “negatives” ea hau ea dijithale.
- Etsa liphetolelo tse lahlehileng bakeng sa ho aba le ho arolelana ho leka-lekanya boleng le boholo ba faele ho latela morero o reriloeng.
- Nahana ka mokhoa o ikhethileng ka maemo a fapaneng a khatello bakeng sa merero e fapaneng (polokelo, lifaele tse sebetsang, kabo).
- Lekola litlhophiso tse fapaneng tsa compression ho fumana tekanyo e nepahetseng pakeng tsa boholo ba faele le boleng ba litaba tsa hau tse itseng.
- Lula u tseba ka mahlale a macha a compression kaha li ka fana ka lintlafatso tse kholo ts’ebetsong le boleng.
- Ngola tšebetso ea compression ea hau ho etsa bonnete ba ho tsitsisa le ho etsa hore tsamaiso ea lifaele tsa nakong e tlang e be bonolo.
Lipotso Tse Botsoang Hangata
A na u ka fetola pakeng tsa khatello e sa lahleheng le ea tahlehelo?
U ka khona ho fetolela ho tsoa ho sebopeho se sa lahleheng ho ea ho se lahlehileng, empa se fapaneng ha se khonehe. Hang ha tlhahisoleseling e lahliloe ka har’a khatello ea tahlehelo, e ke ke ea khutlisoa. Ho fetola ho tloha mofuteng o lahlehileng ho ea ho o sa lahleheng ho tla boloka faele boemong ba eona ba hona joale (ho kenyeletsoa tahlehelo leha e le efe ea boleng), empa e ke ke ea tsosolosa data ea pele e ileng ea tlosoa nakong ea khatello ea pele ea tahlehelo.
Na compression e senya lifaele kapa e etsa hore li se ke tsa tsitsa?
Khatello e se nang tahlehelo ha e senye lifaele – ho ea ka tlhaloso, faele e sirelelitsoeng e tÅ¡oana le ea pele. Khatello ea tahlehelo ha e tlose data ka ho sa feleng, empa sena ke ka moralo mme hangata e lebisa tlhahisoleseling e nang le tÅ¡usumetso e fokolang. Ha e le botsitso, lifaele tse hatelitsoeng hantle ha lia tsitsa ka tlhaho ho feta tse sa tsitsang. Leha ho le joalo, lifaele tse ling tse hatelitsoeng haholo li ka ‘na tsa hlaseloa habonolo ke bobolu, kaha phoso e nyenyane e ka ama lintlha tse ngata ha boitsebiso bo tletse haholo.
Ke hobane’ng ha motho a ka khetha khatello ea tahlehelo haeba e tlosa data?
Khatello ea tahlehelo e fana ka litekanyetso tse betere tsa khatello ho feta mekhoa e sa lahleheng, hangata makhetlo a 10-100 e nyane. Sena se etsa hore e sebetse bakeng sa lits’ebetso moo boholo ba faele, bandwidth, kapa litÅ¡itiso tsa polokelo e leng lintlha tsa bohlokoa. Temohisiso ea bohlokoa ke hore khatello ea tahlehelo e etselitsoe ho tlosa tlhahisoleseling eo batho ba ke keng ba e hlokomela kapa e nang le tÅ¡usumetso e fokolang ho boleng bo lemohuoang. Bakeng sa lits’ebetso tse ngata – joalo ka ho phallela ‘mino, ho arolelana linepe, kapa ho shebella livideo – khoebo e pakeng tsa phokotso e nyane ea boleng ba tekheniki le phokotso e kholo ea boholo ba faele e molemo haholo.
Khatello e ama SEO joang bakeng sa litšoantšo tse liwebsaeteng?
Khatello ea litÅ¡oantÅ¡o e ama SEO haholo ka lebelo la boima ba leqephe, e leng ntlha ea bohlokoa bakeng sa lienjineri tsa ho batla. LitÅ¡oantÅ¡o tse petelitsoeng ka nepo li fokotsa boima ba leqephe le ho ntlafatsa linako tsa ho laeloa, e leng se lebisang ho maemo a betere a boiphihlelo ba basebelisi le maemo a holimo a lipatlisiso. Le hoja khatello ea tahlehelo ka tloaelo e fana ka phokotso ea boholo bo betere, senotlolo ke ho fumana tekanyo e nepahetseng-litÅ¡oantÅ¡o li lokela ho hatelloa ka ho lekaneng hore li jaroe ka potlako empa li boloke boleng bo lekaneng ba ho kopanya basebelisi le ho fetisa boitsebiso ka katleho. Liforomo tsa sejoale-joale joalo ka WebP li fana ka compression e ntle ka boleng bo botle, ‘me ho kenya ts’ebetsong litÅ¡oantÅ¡o tse arabelang ho netefatsa hore lisebelisoa li tsamaisoa hantle.
Na ho na le mokhoa oa compression o sebetsang hantle bakeng sa mefuta eohle ea data?
Ha ho mokhoa o le mong oa compression o sebetsang hantle bakeng sa mefuta eohle ea data. Mefuta e fapaneng ea litaba e na le lintlha tse fapaneng tsa lipalo-palo le lits’enyehelo tse ka sebelisoang hampe. Mongolo o hatella ka tsela e fapaneng le litÅ¡oantÅ¡o, tse hatellang ka tsela e fapaneng le molumo kapa video. Esita le ka har’a sehlopha se kang litÅ¡oantÅ¡o, foto e nang le mebala e boreleli e petetsa ka tsela e fapaneng ho feta setÅ¡oantÅ¡o se bohale se nang le mebala e fokolang. Ke ka lebaka lena ho nang le lifomate tse ikhethileng bakeng sa mefuta e fapaneng ea litaba, le hore na ke hobaneng lisebelisoa tsa sejoale-joale tsa compression li atisa ho sekaseka litaba ho sebelisa algorithm e sebetsang ka ho fetesisa bakeng sa paterone ka ‘ngoe ea data.
Ke tseba joang haeba ke sebelisa boemo bo nepahetseng ba khatello?
Ho fumana boemo bo nepahetseng ba khatello ho hloka ho leka-lekanya lintlha tse tharo: boholo ba faele, boleng le nako ea ho sebetsa. Bakeng sa khatello ea tahlehelo, etsa liteko tsa pono kapa tsa kutlo ho fumana ntlha moo phokotso ea boleng e bonahalang bakeng sa litaba tsa hau le bamameli. Bakeng sa khatello e sa lahleheng, bapisa li-algorithms tse fapaneng ho fumana phokotso e ntle ea boholo bakeng sa mofuta oa hau oa data. Lisebelisoa tse ngata li fana ka maemo a khatello ea pele (mohlala, a tlase, a mahareng, a phahameng), a fanang ka lintlha tse ntle tsa ho qala. Kamehla leka tlhahiso e hatelitsoeng sebakeng seo e reriloeng ho sona-setting ea compression e shebahalang hantle mochining oa hau oa nts’etsopele e kanna ea se be ntle ho lisebelisoa tse fapaneng kapa maemong a fapaneng a ho shebella.
Na ho hatella lifaele ka makhetlo a mangata ho baka tahlehelo ea boleng bo eketsehileng?
Bakeng sa khatello e sa lahleheng, lipotoloho tse pheta-phetoang le tsa decompression ha li na phello ho boleng-faele e lula e tÅ¡oana le ea pele. Bakeng sa khatello ea tahlehelo, potoloho e ‘ngoe le e’ ngoe e ncha ea khatello ka tloaelo e hlahisa tahlehelo ea boleng bo eketsehileng, e tsejoang e le “tahlehelo ea moloko.” Sena se na le bothata haholo ha o sebelisa li-algorithms kapa litlhophiso tse fapaneng melokong eohle. Ka mohlala, ho fetola le ho boloka setÅ¡oantÅ¡o sa JPEG khafetsa ho tla theola boleng ba sona butle-butle. Ho fokotsa tahlehelo ea moloko, kamehla sebetsa ho tsoa ho file ea boleng bo holimo e fumanehang, ‘me u boloke mosebetsi oa mahareng ka lifomate tse sa lahleheng nakong ea ts’ebetso ea ho hlophisa.
Etsa Liqeto tsa Compression Tsebiso
Ho utloisisa phapang lipakeng tsa khatello e sa lahleheng le ea tahlehelo ho u thusa ho ntlafatsa tÅ¡ebetso ea hau ea dijithale, ho boloka sebaka sa polokelo, le ho netefatsa hore litaba tsa hau li boloka boleng bo nepahetseng bakeng sa ts’ebeliso ea tsona.