Pixels nyob rau hauv centimeters? Elementary ...

Vim lub fact tias yuav luag tag nrho cov ntawm peb hnub no yog, yog hais tias tsis muaj ib tug xov tooj, lub cov koob yees duab los yog ntsiav tshuaj, muaj ib tug ntau dua los yog tsawg dlej koob yees duab tam sim no ntes txhua lub caij ntawm lawv lub neej rau lub tsev sau los yog tsis muaj teeb meem. Nyob rau tib lub sij hawm, kho cov tsis muaj cov dluab nyob rau hauv cov gadgets, ntau muaj wondering txog yuav ua li cas txhais tau cov pixels rau hauv centimeters. Yog hais tias koj teem lub rooj siab dhau heev lawm, koj yuav tau ib qhov chaw me me rau ib tug yees duab thiab xa rau nws dhau lub network yuav ua tau ib tug ntev thiab problematic vim cov loj loj. Nyob rau lwm cov tes, ib tug tsis tshua muaj kev daws teeb meem yog yuav luag ib txwm tau txhais hais tias tsis zoo.

Pixels nyob rau hauv centimeters: koj yuav tsum paub yuav txhais li cas?

Ua ntej koj yuav tsum tau meej txog dab tsi ib tug pixel yog. Nyob rau hauv qhov tseeb, nws yog lub me tshaj lub caij ntawm ib raster duab. Nyob rau hauv lwm yam lus, nws yog ib tug me me teev, pleev xim rau nyob rau hauv ib tug xim. Nws yuav tsum tau muab sau tseg hais tias qhov luaj li cas ntawm ib tug pixel yog zoo li qub thiab tsis nyob rau lub specifications ntawm tus dais. Nyob rau hauv thiaj li yuav to taub yuav ua li cas hloov pixels rau centimeters, nws yog tsim nyog los nrog lwm tseem ceeb parameter hu ua DPI. Nws yog tsis tsuas cov kev ceev ntawm lub ntsiab lus ib nti. Qhov loj nws yog, qhov ntau ntse thiab high-zoo daim duab yog tau. Tsis txhob yuav fooled, tias es tsis txhob ntawm lub niaj zaus centimeters rau suav tau siv inches - nti nyob rau hauv translation tsis pom yooj yim, cia li yuav tsum nco ntsoov tus piv: 1 inch = 25,4 hli los yog 2,54 cm tseem mus ntxiv tias nyob rau hauv lub printing kev lag luam, feem ntau. siv dpi = 300, vim nws yog lam xav hais tias cov tib neeg qhov muag yog xav paub ntau tshaj 306 dots ib nti yog tsuas tsis tau pom.

Formula thiab xyaum

Tom qab peb nrog txhua tus tsim nyog tsis rau neeg txhais lus, ib tug yuav tau yooj yim deduce lub mis nyuj tov rau sai sai hloov pixels mus rau hauv centimeters. Thawj luam cov ntaub ntawv muaj nyob rau hauv cov ntaub ntawv cov khoom los yog tsis muaj lub koob yees duab. Lub algorithm yog lub nram qab no: thawj, faib qhov ntev ntawm lub sab nyob rau hauv pixels ntawm daim duab thiab nrhiav dpi nti ntau thiab tsawg pab, thiab ces muab cov qhov tseem ceeb txhais rau 2,54 thiab cov pixels nyob rau hauv centimeters. Raws li koj tau pom, cov neeg txhais lus yog heev yooj yim. Cov mis yuav tsum muab sau rau hauv daim ntawv:

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

x - qhov ntev ntawm ib sab ntawm tus yees duab nyob rau hauv centimeters,

p - tes loj nyob rau hauv pixels,

dpi - ceev luam kev daws teeb meem.

Yuav ua li cas paub qhov luaj li cas ntawm qhov screen pixel

Tej zaum, rau tswv yim lub hom phiaj nws yog pab yuav tsum paub txog yuav ua li cas muaj ntau yam kob dots muaj nyob rau hauv ib tug centimeter ntawm tus dais siv. Qhov yooj yim txoj kev, ntawm chav kawm, nrhiav tau qhov no feature nyob rau hauv phau ntawv. Tab sis li cas yog hais tias nws tau ntev ces muab pov tseg tawm los yog muaj yog tsis teev? Nyob rau hauv cov ntaub ntawv no, koj muaj peev xwm tsuas qhib ib tug duab, qhov ntev thiab dav, nyob rau hauv pixels, yog paub nyob rau hauv ua ntej, thiab los ntsuas tus tib tsis muaj txoj cai. Ces yuav nrhiav tau cov kev sib raug zoo ntawm ob tog thiab tau txais cov kev kawm no.

Nrog ib tug me ntsis kev xyaum

Piv txwv peb xav sau ib tug yees duab xwm A3 (ob album nplooj ntawv) nyob rau hauv kev txiav txim mus dai nws rau ntawm phab ntsa. Yuav ua li cas yog qhov tsawg kawg nkaus specifications yuav tsum muaj xws li ib tug duab? Standard ntau thiab tsawg pab A3 yog 297 × 420 hli (29.7 x 42 cm). Rau suav siv tus txheem nqi ntawm 300 dpi. Raws li cov saum toj no mis: p = x * dpi / 2,54. Ces tus duab dav yuav tsum muaj tsawg kawg p = 42 * 300 / 2,54 = 12 600 / 2,54 ≈ 4961 px, thiab qhov ntev: p = 29,7 * 300 / 2,54 ≈ 3508 px.