Amaphikseli e ngamasentimitha? Elementary ...

Ngenxa yokuthi cishe sonke namuhla, uma hhayi ifoni, ikhamera digital noma ithebhulethi, kokuba ikhamera ucishe ehloniphekile manje uthwebule yisiphi isikhathi zokuphila ekhaya iqoqo akuyona inkinga. Ngesikhathi esifanayo, ukulungisa kwemigomo izithombe kwi zobuchwepheshe, abaningi bemangele ukuthi bahumushe pixels ku ngamasentimitha. Uma usethe ukulungiswa liphezulu kakhulu, uthola isikhala esincane isithombe bese uthumela ngenethiwekhi kungaba eside futhi eziyinkinga ngenxa yobukhulu enkulu. Ngakolunye uhlangothi, izwi lesinqumo ongaphakeme cishe ngaso sonke isikhathi ukuthi izinga abampofu.

Amaphikseli e amasentimitha: odinga ukukwazi okuzohumushwa?

Okokuqala udinga ukuthi sicacise ukuthi yini yephikseli. Empeleni, kuba isici esincane kunazo zonke umfanekiso raster. Ngamanye amazwi, kuba ichashaza amancane, ababethi umbala othile. Kufanele kuqashelwe ukuthi ubukhulu elilodwa kwe-pixel kukhona static futhi akuxhomekile Ukucaciswa zedivayisi. Ukuze uqonde ukuthi ukuguqula Amaphikseli ukuba amasentimitha, kubalulekile ukubhekana nomunye ipharamitha ezibalulekile okuthiwa DPI. Akuyona nje kwabantu amaphuzu intshi ngayinye. I emikhulu njengoba linjalo, njengeliyiZwi abukhali kakhulu futhi eliphezulu isithombe is eyatholakala. Ungakhohliswa, ukuthi esikhundleni amasentimitha evamile tekubala kumele usebenzise amayintshi - intshi ukuhumusha abakubheki kalula, nje kudingeka sikhumbule la isilinganiso: 1 intshi = 25,4 mm noma 2,54 cm uhlala ukwengeza ukuthi abasembonini yokunyathelisa, ngokuvamile. zisebenzisa dpi = 300, ngoba kucatshangwa ukuthi iso lomuntu liwumsebenzi ezingaphezu kuka 306 amachashazi intshi ngamunye bamane nje abakwazi ukubona.

Formula nabakwenzayo

Ngemva esibhekana nazo zonke nemingcele ezidingekayo ukuze kuhunyushwe, omunye kalula ngokuthini ifomula ngokushesha ukuguqula Amaphikseli ku ngamasentimitha. idatha ukuphrinta Original ingatholakala izakhiwo ifayela noma kwemigomo ikhamera. I algorithm okulandelayo: kuqala, uhlukanisa ubude emaceleni ngamaphikseli isithombe bese uthole dpi intshi osayizi, bese wande lezi zimiso ukuhumusha ukuze 2,54 kanye pixels ngamasentimitha. Njengoba ubona, ukuhunyushwa silula. Ifomula kungenziwa yalotshwa njengezingoma zohlobo oluthile:

x = 2,54 * p / dpi, lapho:

x - ubude ingxenye esithombeni ku amasentimitha,

p - usayizi isandla ngamaphikseli,

dpi - ukuminyana ukuphrinta isixazululo.

Indlela ukwazi ubukhulu Isikrini sephikseli

Ngezinye izikhathi, i-ima- kuyasiza ukuqaphela amachashazi amaningi indlela anemibala equkethwe isentimitha zedivayisi esetshenziswa. Indlela elula, yebo, thola lesi sici ku bhukwana. Kodwa kuthiwani uma wayekade eside baxoshwa noma kukhona ayicacisiwe? Kulokhu, ungakwazi umane ukuvula isithombe, ubude nobubanzi, in Amaphikseli, zaziwa kusengaphambili, futhi ukukala nemingcele efanayo nalo mthetho. Khona-ke uzothola ubuhlobo amaqembu bese uthole umphumela oyifunayo.

Ngokuphrakthiza okuncani

Ake sithi sifuna ukunyathelisa A3 isithombe nemvelo (amakhasi amabili albhamu) ukuze hang odongeni. Yiziphi Ukucaciswa ubuncane kufanele abe isithombe esinjalo? osayizi Standard A3 kuyinto 297 × 420 mm (29.7 x 42 cm). Ukuze izibalo isebenzise inani esezingeni 300 dpi. Ngokusho ifomula ngenhla: p = x * dpi / 2,54. Khona-ke ububanzi isithombe kufanele okungenani p = 42 * 300 / 2,54 = 12 600 / 2,54 ≈ 4961 px, futhi ubude: p = 29,7 * 300 / 2,54 ≈ 3508 px.