I-scanners iveza impilo yakho ezweni ledijithali ...
Yebo, kunezinhlobo eziningi zama-scanner, kodwa iningi labo (ngaphandle kwalabo abathwebulayo bembhoshini esetshenziselwa imboni yokushicilela) idatha "yokubamba" -ba yimibhalo yombhalo, ihluzo zebhizinisi, noma izithombe, kufaka phakathi ifilimu, ukubonakala, amaslayidi , kanye nezenzo ezimbi-ngendlela efanayo, okuyihloko yalesi sihloko. Ingabe isithwebuli sithatha kanjani ikhasi elikopishekile, liphinde likhiqize okuqukethwe kwayo, bese lidlulisela lelo datha kwifayili yekhompyutha engakwenzela wena nami njengoba sithanda?
Idivayisi Ekhokhisiwe-Ehlanganisiwe (CCD) I-Array
Ngesikhathi ama-scanners enziwe izingxenye eziningana ezihlukene, njengezibuko, amalensi, ama-motor, nokuningi. Eziningi zezinkinobho zanamuhla, noma kunjalo, ingxenye eyinhloko iyinhlanganisela yedivayisi ehlanganisiwe (CCD). Iqoqo lezindidi ezikhanyayo eziguqula i-photons (ukukhanya) kuma-electron, noma amacala kagesi, lawa madiode ayaziwa ngokujwayelekile njengezithombe ze- photosites .
Ama-photosites azwela ekukhanyeni; ukhanyisa ukukhanya okukhulu ukushayela kagesi. Kuye ngesibonelo se-scanner, isithombe esithwetshiwe noma idokhumenti ithola indlela eya ku-CCD uhlu ngokusebenzisa uchungechunge lens, izihlungi, nezibuko. Lezi zakhi zakha ikhanda lokuskena . Phakathi nenqubo yokuskena, ikhanda lokuskena liyadluliselwa kulitshe (into ekhishwayo).
Kuye ngesithwebuli, ezinye zingu-single-pass kanti ezinye ziyi-pass-ezintathu, okusho ukuthi bayathatha into ekhonjiswe kudlula noma eyodwa, ngokulandelana. Ku-scanner ezintathu-pass, iphase ngayinye ithatha umbala ohlukile (obomvu, obuluhlaza, noma obuluhlaza), bese isofthiwe iphinda ifane neziteshi zemibala emithathu ye-RGB, ubuyisele isithombe sangempela.
Namuhla, iningi le-scanners liyingqayizivele elilodwa, ne-lens eyenza ukuhlukaniswa okwamanje kwamashaneli amathathu ombala, ngaphandle kokuba umsebenzisi abe yihlakaniphi.
Isixhumanisi sithombe soxhumana naye
Enye, ezobuchwepheshe obuncane bokudlala izithombe zobuciko ukuze uthole umhlabathi wamuva nje inzwa yocingo lokuxhumana (CIS). I-CIS ithatha indawo ye-CCD, ngokuhlelwa kwayo kwezibuko, izihlungi, isibani, nama-lens, enezinhlu zokukhanya ezibomvu, eziluhlaza okwesibhakabhaka, eziluhlaza, nokuluhlaza (RGB) (ama-LED). Lapha, umshini wesithombe sezinzwa unamapenseli angu-300 kuya ku-600 ahlukanisa ububanzi besendaweni noma iskena. Ngenkathi isithombe sesithwetshiwe, ama-LED ahlanganisa ukunikeza ukukhanya okumhlophe, ukukhanyisa isithombe, esithathwe yizinzwa.
Ama-scanners e-CIS awahlinzeki ngokujwayelekile ngezinga elifanayo lekhwalithi nokuxazulula okulethwa yimishini esekelwe e-CCD, kodwa okwangaphambili ngokuvamile ilula, ilula, futhi ishibhile.
Isixazululo nokujula kombala
Yiziphi izinqumo okufanele uzikhende kuzo kuxhomeke lapho uhlela khona ukusebenzisa isithombe. Abahloli bekhompyutha, amaphilisi, nama-smartphones abakwazi ukubonisa izinqumo ezingaphezu kwamachashazi angu-72 nge-inch (dpi), nabakhokeli be-HD abesekela ama-96dpi. Into eyenzekayo uma uskena isithombe ngesinqumo esiphezulu kunokuba singaboniswa ngaso, idatha engaphandle ixoshwa ngaphandle, okuyiqiniso, kuthatha isikhathi.
Izithombe ezisezinhlakeni zakho zokugcina eziphezulu nokunye, ngakolunye uhlangothi, zindaba ehlukile. Ukuze uthole imiphumela emihle kakhulu, kufanele uhlale uyishintsha okungenani okungama- 300dpi, futhi ephakeme, ephakeme kakhulu, uma kungenzeka-nje uma kwenzeka udinga ukukhulisa isithombe ngesikhathi sokuhlela.
Ukujula kombala kuchaza inani lemibala isithombe esithile (noma ukuskena) iqukethe. Amathuba angama-8-bit, angu-16-bit, ama-24-bit, ama-36-bit, ama-48-bit, nama-64-bit, anemibala yangaphambili engu-8-bit, esekela ama-256 noma ama-shades ama -griliyoni asekela ama -64-bit. imibala-kakhulu kunokuba iso lomuntu likwazi ukuqonda.
Ngokusobala, ngaphakathi kwesizathu, izinqumo eziphakeme kanye nokujula kombala ojulile kuthuthukisa ikhwalithi yeskena, ngokuqinisekile. Imibala, ikhwalithi, nemininingwane kufanele ibe khona ngaphambi kokuthi uskena. Kungakhathaliseki ukuthi isithwebuli sakho esihle kangakanani, singenza izimangaliso.