Daws daws teeb meem daws teeb meem (2)
Peb yog ib lub lag luam loj hauv Shenzhen Tuam Tshoj. Peb muaj cov phau ntawv luam tawm, phau ntawv nyuaj, phau ntawv luam ntawv, phau ntawv nyuaj, phau ntawv luam tawm, phau ntawv luam tawm, phau ntawv luam tawm, lub thawv ntim, daim qhia ntawv, txhua yam ntawm PVC, cov ntawv luam tawm, ntawv sau cia, hom tshwj xeeb ntawv xim luam tawm khoom, kev ua si cardand li ntawd.
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Feem ntau cov khoom luam tawm tam sim no nyob rau hauv lub khw muaj software thiab kho vajtse extensions rau kev daws teeb meem. Qee lub tshuab luam yeeb tsuas sau ntawv 9600 × 9600 DPI, uas tsuas yog qhov siab tshaj plaws tau txais los ntawm software interpolation, tsis yog qhov tseeb kev daws teeb meem ntawm lub tshuab. Yog li ntawd rau lub tshuab hluav taws xob, qhov kev daws teeb meem tau kho qhov teeb meem (lossis kho qhov muag kho) thiab qhov siab tshaj plaws.
Peb hais tias qhov kev daws teeb meem ntawm ib lub tshuab hluav taws xob yog siab li 4800 DPI (4800 DPI no yog qhov sib xyuam ntawm qhov kho qhov daws teeb meem thiab kev sib txawv ntawm software), uas txhais tau hais tias thaum cov duab tawm tswv yim los ntawm lub tshuab luam tawm, 4800 × 4800 Pixel yuav tsum tau sau rau ntawm kev soj ntsuam ntawm lub dav hlau ntawm 1 nti 2. Kev xaav ntawm qhov 1 inch 2 square yog 4800 × 4800 Pixel tom qab luam xa nrog 4800 DPI. Thaum luam ib daim duab, lub siab dua qhov kev daws teeb meem yog teeb, tus finer cov duab generated yog, thiab qhov loj dua cov duab ua duab yog.
(2) lub tshuab luam ntawv
Peb hais tias qhov kev daws teeb meem ntawm ib lub tshuab luam ntawv yog 360 DPI, uas txhais tau hais tias thaum cov duab tso tawm los ntawm lub tshuab luam ntawv, 360 xim ntsiab lus sawv cev cov duab tso tawm cov nyhuv tawm tau luam tawm ntawm txhua nti ntawm cov ntawv luam tawm. Qhov loj dua tus naj npawb uas sawv cev ntawm lub teeb meem ntawm lub tshuab luam ntawv, qhov me me xim qhov taw qhia uas yog cov duab tso tawm, thiab cov khoom tso zis.
Rau cov duab nrog cov ntawv me me, qhov loj dua qhov daws teeb meem ntawm lub tshuab luam ntawv, me me qhov loj ntawm daim duab. Qhov loj ntawm lub tshuab luam ntawv xim xim tsuas yog muaj feem xyuam rau cov txheej txheem kho mob ntawm lub tshuab luam ntawv, tsis hais txog kev daws teeb meem ntawm cov duab kom tau tawm.
(3) tso saib
Peb hais tias qhov kev daws teeb meem ntawm ib lub npe khoom yog 80 DPI, uas txhais tau hais tias cov khoom tso tawm ntawm cov zaub yuav tsim tau 80 me ntsis ib nti ntawm qhov kev tshuaj ntsuam nyob rau hauv cov duab zoo ntawm cov duab. Piv txwv li, 14-nti npo (npo ntev ntawm 14 ntiv tes) nrog ib teev pitch ntawm O.28mm, ces: tso saib daws teeb meem = 25.3995mm / inch ÷ 0.28mm / Dot = 90DPI (1Inch = 25.3995mm).
Thaum cov khoom xa los ntawm lub hoobkas, qhov nqi DPI uas nruab nrab ntawm qhov daws teeb meem ntawm cov khoom no feem ntau tsis qhia. Tsuas yog cov ntawv teev qhia npe xwb. Peb tuaj yeem suav qhov daws teeb meem raws li cov qauv saum toj no. Raws li peb cov nuj nqis DPI peb tau, peb tuaj yeem xav paub ntau tshaj cov qauv qhia tau tias cov khoom yuav pab txhawb. Paub hais tias tus kab pheeb ces kaum ntev ntawm cov khoom siv zoo tshaj ntawm 14 nti npo cov npo yog 11.5 nti. Txij li thaum tus qauv piv ntawm kab sab tav toj thiab txoj kev taw qhia ntawm txoj kab yog 4: 3, cov khoom siv tau zoo yuav muab teem rau ntawm txoj kab dav dav ntawm 4 nti thiab qhov siab ntawm 3Xchaw. Cov zauv Pythagorean theorem muaj peev xwm muab tau los ntawm x = 11.5 ÷ 5 = 2.3inch. Yog li, qhov pom tau zoo tshaj qhov dav dav yog 2.3 × 4 = 9.2 nti, qhov siab qhov siab yog 2.3 x 3 = 6.8 nti. Qhov kev tso duab siab tshaj plaws yog kwv yees li 800 (9.2 x 90) x 600 (6.8 x 90), uas yog ib qho pixel (Lauj kaub) yog muaj los ntawm cov teev (Dot).
Qhov saum toj no tsuas qhia txog kev daws teeb meem ntawm lub tshuab hluav taws xob, lub tshuab luam ntawv thiab cov duab. Nyuaj hais, kev daws teeb meem ntawm lub cuab yeej thiab kev daws teeb meem ntawm cov duab ua los ntawm lub cuab yeej yog ob lub ntsiab lus uas muaj ob qho kev sib txuas thiab txawv. Lub rooj ntawm lub cuab yeej txiav txim siab los ntawm kev tsim cov txheej txheem ntawm cov cuab yeej hardware. Txawm hais tias kev daws teeb meem ntawm qee yam khoom siv tau kho los ntawm software, lawv txhua tus muaj kev daws teeb meem heev thiab tus neeg siv tsis tuaj yeem ua rau muaj kev cuam tshuam.
Thaum piav txog thiab nkag siab txog kev daws teeb meem. Peb yuav tsum tso siab rau qhov kev daws teeb meem ntawm cov duab nws saib xyuas. Kev daws teeb meem ntawm cov duab yog ib qho kev ntsuas seb qhov duab zoo li cas yog qhov zoo. Rau cov duab thaij duab los ntawm cov tshuab luam yeeb thiab luam ntawv, qhov kev daws teeb meem yog pes tsawg tus pixels ib nti, PPI (Pixels).
Ib Thaj Noob) los ntsuas. Ib qho duab siv rau computer video ua, sawv cev rau qhov kev daws teeb meem ntawd pes tsawg tus pixels uas tau tshwm nyob rau hauv kab rov tav thiab ntsug lus, xws li 800 × 600, 640 × 480, thiab lwm yam. rau qhov daws teeb meem ntawm daim duab, thiab nws yog qhov ywj siab ntawm cov cuab yeej kho vajtse uas ua haujlwm rau nws, tab sis qhov kev tshwm sim ntawm daim duab zoo tab sis ncaj qha ntsig txog kev daws teeb meem ntawm lub tshuab.
2. Cov koob yees duab digital
Kev daws teeb meem ntawm lub koob yees duab digital txiav txim siab qhov loj ntawm cov duab zoo uas yuav luam tau rau hauv daim duab kawg, los yog qhov loj ntawm daim duab tso tawm ntawm lub computer saib. Kev daws teeb meem ntawm lub koob yees duab digital yog nyob ntawm CCD nyob rau hauv lub koob yees duab (Tus Coj Coupled Device: Charge Coupled Device) Tus naj npawb ntawm pixels ntawm chip, ntau pixels, ntau dua qhov kev daws teeb meem. Nws pom tau tias qhov daws teeb meem ntawm cov koob yees duab digital kuj yog txiav txim los ntawm nws cov txheej txheem rau kev lag luam. Nws yog tsau rau ntawm lub hoobkas, thiab tus neeg siv yuav tsuas xaiv tau lub koob yees duab digital uas muaj ntau yam kev daws teeb meem, tab sis tsis kho qhov daws teeb meem ntawm cov koob yees duab. Rau cov koob yees duab zoo ib yam, lub siab dua qhov kev daws teeb meem, lub siab tshaj qhov koob yees duab qib siab, tiam sis lub koob yees duab siab-high-resolution ua rau cov ntaub ntawv loj, uas yog siab dua rau kev ceev ntawm kev siv computer, lub cim xeeb thiab lub zog ntawm daim disk, software. Yuav tsum tau ua.
Pixel theem ntawm lub digital koob yees duab thiab qhov loj ntawm daim duab uas tuaj yeem luam tau ntawm ib qho kev daws teeb meem tau yooj yim los ntawm cov nram qab no: Yog hais tias daws teeb meem ntawm lub tshuab luam ntawv xim NDPI, lub pixel kab ntawm cov koob yees duab digital yog M, thiab qhov yees duab siab tshaj plaws yog M ÷ N. inch. Piv txwv, qhov kev daws teeb meem ntawm lub tshuab luam ntawv yog 300 DPI, thiab qhov siab tshaj plaws ntawm daim duab duab uas luam tau los ntawm cov koob yees duab digital nrog ib lub pixel ntawm 3600 yog 12 nti (3600 ÷ 300). Obviously, qhov loj dua qhov luaj li cas ntawm cov yees duab yuav tsum luam, ntau dua pixel qib ntawm cov koob yees duab. Tus qauv ntawm kev ntsuas qhov loj me yog tib yam li tus qauv ntawm kev luam qhov loj.
3. Txiav txim siab hauv kev luam ntawv
Hauv kev tshuam ntawm kev luam ntawv, qhov kev daws teeb meem yog pes tsawg txoj kab sib txuas hauv kev sib npaug ntawm ib nti, piv txwv li LPI (Lines Per Inch). Nyob rau hauv cov ntawv luam ntawv phaj ua cov txheej txheem, ib qho tshuaj ntsuam ntxiv nyob rau hauv pem hauv ntej ntawm daim duab thawj zaug thaum lub phaj txiav txim siab, thiab qhov screen yog tsim los ntawm ib daim phiaj ntawm cov pob tshab thiab cov xim opaque. Cov xov hlau no kuj yog cov gratings, uas muaj nuj nqi los txiav cov duab anatomical ntawm lub teeb. Txij thaum lub teeb muaj ib qho cuab yeej ntawm lub cev, lub teeb kis tau los ntawm kab mesh rau daim ntawv teev tias muaj ntau qhov loj ntawm daim duab duab, thiab cov dots yog halftone dots. Ib nrab hnub taw qhia tsis tshaj li ntawm thaj chaw mesh feem ntau. Ntau lub network cable, cov khaubncaws sab nraud povtseg ntxiv ntawm daim duab muaj cov naj npawb, thiab qhov zoo dua daim duab zoo. Yog li, LPI sawv cev kev daws teeb meem yog siv rau hauv kev luam tawm lag luam.
4. Kev daws teeb meem ntawm lub ntsiab lus
Qhov daws teeb meem yog hais txog cov ntsiab lus uas tau pom los ntawm 1 nti ntawm lub zog. Qhov ntau dua qhov kev daws teeb meem, qhov siab tshaj qhov zoo. Yav tas los, kev daws teeb meem ntawm tus nas feem ntau yog 100 DPI, thiab lub sijhawm daws teeb meem tam sim no ntawm 200 DPI mus rau 400 DPI. High-resolution mouse yog feem ntau siv rau kev kos duab thiab yog lub computer graphics.
5. Kov kev tshuaj ntsuam daws teeb meem
Kev daws teeb meem ntawm qhov kev tshuaj ntsuam yog hais txog kev faib khoom rau hauv tus cej luam tawm. Nws yog feem ntau hais nyob rau hauv cov nqe lus ntawm cov neeg sib tham nyob rau hauv lub tav toj thiab ntsug qhia, piv txwv li 32 x 32. Qee cov neeg xav tias ntau dua qhov daws teeb meem ntawm lub kov screen, qhov zoo dua. Qhov no tsis yog qhov teeb meem. Thaum siv qhov screen kov, nws yuav tsum raug txiav txim siab raws li qhov kev siv. Lub vijtsam kov nrog cov tshuab analog muaj ib qho kev daws teeb meem ntawm 1024 × 1024, uas yog tsim rau qee yam haujlwm xws li thaij duab thiab sau ntawv (tes sau npe). Feem ntau, daim ntawv thov kov tshuab tsuas yog cia cov neeg kov lub pob kom xaiv qhov "khawm" ntawm software tsim, nws tsis yog qhov yuav tsum tau siv xws li kev daws teeb meem. Piv txwv, thaum siv lub vijtsam ntawm 14-nti npo, qhov loj ntawm daim duab thaj chaw yog feem ntau 25 × 18.5 cm, thiab ib qho screen kov nrog daws teeb meem ntawm 32 × 32 tuaj yeem faib qhov screen rau 1024 0.78 × 0.58 cm (me tshaj haus luam yeeb) Hu rau. Kev tiv thaiv ntawm tib neeg cov ntiv tes tiv thaiv lub vijtsam kov tau ntau dua li ntawm txoj kab uas hla ntawm lub luam yeeb, yog li ntawd muaj kev sib cuag tau txaus.
Peb, qhov txawv ntawm dots (Dot) thiab pixels (Pixel)
Cov dot nyob hauv DPI thiab cov pixel hauv daim duab daws teeb meem (Pixel) yog ob lub ntsiab lus uas yooj yim tsis meej. Tus taw tes rau hauv DPI tuaj yeem hais tias yuav tsum yog cov khoom me tshaj ntawm cov cuab yeej hardware, thiab lub pixel yuav yog ib qho taw qhia los yog ntau tus pixel. Ib phau ntawm cov ntsiab lus. Thaum lub scanner scans daim duab, txhua tus qauv ntawm lub tshuab luam ntawv sib raug rau txhua tus duab pixel ntawm cov duab ua, ces DPI tus nqi teev thaum lub sij hawm luam xa mus rau PPI tus nqi ntawm cov duab scanned. Yuav ua ncaj.
Tab sis feem ntau, qhov txawv ntawm ob yog loj heev. Piv txwv, tus duab nrog lub rooj sib tham ntawm 1 PPI yog tawm ntawm 300 lub tshuab luam ntawv DPI. Nyob rau lub sij hawm no, txhua pixel ntawm daim duab sib raug mus rau 300 × 300 Dot thaum sau. Cov teeb meem zoo sib xws nyob rau hauv kev siv computer monitor. Piv txwv, qhov pom tau zoo ntawm thaj tsam ntawm 12-inch yog 200 × 160 hli. Yog hais tias qhov chaw diameter ntawm lub vijtsam yog 0.31 hli, qhov siab tshaj plaws ntawm cov npoo uas yuav tshwm rau ntawm qhov screen yog 640 (200 ÷ 0.31). ) × 480 (160 ÷ 0.31), qhov kev sib haum xeeb yog 80 DPI.
Plaub, lub luag haujlwm ntawm txoj kev daws teeb meem
Nws muaj ntau txoj hauv kev los sawv cev daws teeb meem, nyob ntawm daim ntawv thov. Cov kev sib tham hauv qab no yog hais txog lub luag haujlwm ntawm kev txiav txim siab hauv ntau lub sijhawm thiab lawv txoj kev sib raug zoo.
1. Lub luag haujlwm ntawm kev daws teeb meem hauv kev tsim duab
Nyob hauv tus qauv tsim, kev daws teeb meem ntawm cov duab yog ntsuas los ntawm PPI, uas ua ke nrog qhov dav thiab qhov siab ntawm daim duab pom qhov loj thiab cov duab zoo ntawm cov duab cov duab. Piv txwv, tus duab yog 8 nti dav thiab 6 nti siab nrog kev daws teeb meem ntawm IOOPPI. Yog hais tias qhov luaj li cas ntawm cov duab cov ntaub ntawv khaws cia tas li, uas yog, tag nrho cov pixels yog tib yam, qhov kev daws teeb meem yog txo mus rau 50 PPI, thiab qhov piv piv no tas li. Qhov dav ntawm daim duab yuav ua l6inch thiab qhov siab yuav ua 12inch.
Ob cov duab ua ntej thiab tom qab luam tawm hloov, peb yuav pom tau tias qhov kawg hom ntawv yog plaub zaug ntawm yav tas los, thiab cov duab zoo tau poob ntau. Yog li ua li cas rau cov duab ua ntej thiab tom qab ob qhov kev hloov xa tuaj rau lub computer saib? Piv txwv, yog hais tias lawv raug xa mus rau ib qho kev nthuav dav nrog 800 x 600, peb yuav pom tau tias daim duab loj ntawm ob daim duab zoo li qub, thiab cov duab zoo tsis txawv. Rau lub computer saib system, tus nqi PPI ntawm cov duab tsis muaj qab hau, thiab tag nrho cov pixels uas muaj nyob hauv daim duab siv, uas yog lwm txoj kev daws teeb meem uas tau piav saum toj no: txoj kab nruab nrab Number of pixels × tus naj npawb ntawm pixels nyob rau hauv txoj kev taw qhia. Lub rooj sib tham daws teeb meem no qhia txog qhov dav thiab qhov siab ntawm daim duab thaum nws tshwm. Ob daim duab ua ntej thiab tom qab hloov PPI nqi saum toj no muaj tag nrho pixel suav ntawm 800X600, yog li lawv yog ob qho tag nrho cov duab nrog tib lub qauv thiab tib hom thaum tso tawm kom pom.
2. Lub luag hauj lwm ntawm qhov kev daws teeb meem ntawm kev luam tawm
Cov duab ua nyob hauv computer yog cov zis ua luam tawm. Feem ntau cov ntawv luam tawm, CMYK (magenta, cyan, daj, dub) plaub xim xim siv los nthuav qhia cov yeeb yuj xim, tab sis txoj kev luam tawm xim txawv ntawm qhov yees duab, uas siv cov kev kho mob ib nrab hnub. Cov qauv no yog qhia txog kev hloov ntawm daim duab, tsis zoo li yav tas los, uas tuaj yeem ncaj qha rau qhov kev hloov ntawm kev nruj laus. Raws li cov kev lag luam luam, tag nrho LPI qhov tseem ceeb ntawm cov luam ntawv muaj xws li kev sib raug zoo nrog tus nqi PPI ntawm thawj daim duab, namely: PPI nqi = LPI nqi × 2 × siab tshaj qhov loj tshaj ntawm daim duab loj tshaj ntawm daim duab .
Feem ntau, tsuas yog ua raws li cov qauv no, cov duab qub yuav zoo dua hauv cov ntawv luam. Tus nqi LPI siv hauv kev luam tawm kuj raug tsau, feem ntau 75LPI rau cov ntawv xov xwm luam tawm thiab 150LPI lossis 175LPI rau xim luam ntawv. Yog li ntawd, thaum 1: 1 luam ntawv, kev daws teeb meem ntawm daim duab yuav tsum yog 150PPI, 300PPI thiab 350PPI rau ntau lub hom phiaj.
Qhov tseeb tiag, feem ntau ntawm peb cov duab siv feem ntau siv halftone dot processing. Cov qauv saum toj no kuj muaj feem xyuam, tab sis lawv tsis siv ib lub vij tshab thaum luam ntawv, tab sis cia siab rau cov lej ntawm kev ua lej kom ncav cuag halftone dots. Ua. Ib nrab ntawm daim ntawv teev npe ntawm cov ntawv luam tawm muaj ntau cov ntawv luam tawm. Obviously, qhov ntau dots uas ua li ib halftone dot, ntau dua qhov ntau ntawm grayscale variations nws tuaj yeem sawv cev. Piv txwv, simulate 256-theem grayscale hloov, koj xav tau 16 × 16 = 256 luam dots tsim ib nrab halftone.