Nawa Pixels a cikin Inch (PPI)?

Babu amsa mai kyau ga wannan tambaya

Nau'in pixels da inch (PPI) na nuni shine abin da ake kira dutsen pixel kuma shine ainihin nau'in pixels za ku ƙidaya idan kun ƙidaya pixels, a kwance ko a tsaye, wanda ya kasance a cikin guda ɗaya a kan nuni.

Akwai dalilai da dama da ya sa ya san adadin pixels a cikin wani inch daga cikin nuni, amma yawanci wannan yana taimakawa sosai yayin da kake ƙoƙarin tunanin yadda yadda hoto a kan allo zai iya duba wani allo daban.

Wani ra'ayi na kowa shi ne cewa kana buƙatar ka san wani nuni ko Fayil na PPI don gane yadda babban ko karamin hoto zai iya bayyana lokacin da aka buga, amma ba a cikin wannan hali ba. Karin bayani a kan ƙasa.

Babu Babu Amsawa ga Pixels da Inch

Idan dukkanin pixels sun kasance girman daidai, pixels a cikin wani inch zai zama sanannun adadi nawa kamar sidimita daya cikin inch (2.54) ko kuma adadin inci a cikin kafa (12).

Duk da haka, pixels suna da girma daban-daban a kan nuni daban-daban , saboda haka amsar ita ce 58.74 pixels da inch a kan talabijin na 75 "4K, misali, da 440.58 pixels da inch a kan wani fim na 5" Full HD.

A wasu kalmomi, yawancin pixels da inch ya dogara da girman da ƙudurin allon da kake magana akan haka, saboda haka dole mu yi math don samun lambar da kake da shi don naka.

Yadda za a ƙayyade Pixels a cikin Inch

Kafin mu shiga cikin abin da yake kama da math na gaba (ba haka ba, ba damuwa ba), mun yi aiki mai wuyar gaske a gare ku saboda yawan nuni a cikin Table na Pixels Per Inch a kasan shafin.

Idan kun sami PPI dinku, kunna zuwa Yadda za a yi amfani da maƙallanku ta lambar ƙwaƙwalwar , amma in ba haka ba, zamu kwatanta shi a nan tare da matakai na ilimin lissafi kaɗan.

Abinda za ku buƙaci a kowace harka shine girman girman zane a cikin inci da maɓallin allon . Duk waɗannan lambobi za a iya samuwa a kan shafin ƙididdiga na fasaha na allonka ko na'ura.

Duba yadda za a sami bayanin bayanan mai kwarewa idan kana buƙatar taimako don kaɗa wannan.

Ga cikakken daidaitattun ladaranku don matakan kwarewa, amma ku tsallake gaba da shi don matakan mataki-mataki-mataki:

ppi = (√ ( w ² + h²)) / d

... inda ppi ne pixels da inch kake ƙoƙarin ganowa, w shine iyakar ƙuduri a cikin pixels, h shine ƙuduri tsawo a cikin pixels, kuma d shine girman diagonal na allon a cikin inci.

Idan kuka yi barci a lokacin tsari na baftisma a cikin lissafin lissafi, ga yadda kuke yin haka tare da misali na allon 60 "4K (3840x2160):

1. Sanya zanen faxels : 3840² = 14,745,600
2. Ƙaddamar da tsawo pixels: 2160² = 4,665,600
3. Ƙara waɗannan lambobi tare: 14,745,600 + 4,665,600 = 19,411,200
4. Dauki tushen tushen wannan lambar: √ (19,411,200) = 4,405.814
5. Raba wannan lambar ta hanyar allon diagonal: 4,405,814 / 60 = 73.43

A cikin matakai guda biyar, mun ɗauka pixels a cikin wani inci a kan wayar tarho 60 "4K don zama 73.43 PPI. Duk abin da kuke buƙata a yanzu an sake maimaita matakai biyar tare da nuni, ta yin amfani da ƙuduri da girmanku.

To, yanzu ku san PPI dinku na fitowa ... amma yaya kyau yake? Idan kun kasance mai ban sha'awa, kuna aikatawa! Duk da haka, kamar yadda muka ambata a cikin gabatarwa a sama, mafi yawan lokutan na'urar ko nuna PPI shine na farko na matakai guda biyu don samun wani abu mai yawa.

Yadda za a yi amfani da Lambobin ku ta lambar ƙira

Yanzu da ka san allonka ko na'urar PPI, lokaci ya yi don sanya shi zuwa amfani mai kyau.

Ƙayyade yadda babban hoto zai dubi wani na'ura

Kuna iya ƙirƙirar ko gyara hoto a kan kwamfutar tafi-da-gidanka na 17 "tare da hoton HD (129.584 PPI) amma san cewa za ku nuna shi a kan nuni na UHD 84" 4K (52.45 PPI) a ofishin a mako mai zuwa.

Yaya za ku iya tabbatar da cewa an halicci hoton da yawa ko yana da cikakken bayani?

Don amsa wannan tambayar, za ku fara buƙatar sanin PPI na na'urar ko nuna cewa kuna sha'awar . Mun koyi yadda za a yi wannan a cikin sashe na karshe, ko ka sami lambar ɗaya ko lambobi biyu a teburin da ke ƙasa.

Har ila yau kuna bukatar sanin ainihin siffar hoto na kwance da tsaye . Kana ƙirƙira ko gyarawa don haka ya kamata ya zama mai sauƙin isa don samun a cikin shirin hotunanku.

Kamar dā, a nan ne cikakken daidaitattun idan kuna da sha'awa, amma umarnin sun kasa:

hsize = w / ppi vsize = h / ppi

... inda zane da vsize su ne hotunan ta kwance da tsaka-tsalle a cikin inci, bi da bi, a kan sauran nuni, w shine nisa na hoton a cikin pixels, h shine tsawo na hoton a pixels, kuma ppi shine PPI na da sauran nuni.

Ga yadda zaka yi haka idan hotonka ya kasance 950x375 pixels a girman da kuma nuni da kake shirinwa shine allon 84 "4K (3840x2160) (52.45 PPI):

1. Raba nisa daga PPI: 950 / 52.45 = 18.11 "
2. Raba tsawo ta PPI: 375 / 52.45 = 7.15 "

A nan mun nuna cewa, ko ta yaya "babban" ko "karamin" hotunan zai iya zama akan allonku, tare da siffofin pixel na 950x375, wannan hoton zai bayyana 18.11 "ta 7.15" a kan 84 "4K TV shi" Y za a nuna a.

Yanzu zaka iya amfani da wannan ilimin da ka ga ya dace ... watakila shi ne kawai abin da ka kasance bayan, ko watakila hakan bai isa ba idan ka la'akari da cewa allon 84 "na da kusan 73" a fadin kuma 41 "tsayi!

Ƙayyade girman Siffar Hotuna Zai Rubuta a Cikakken Sakamako

Abin farin ciki, bazai buƙatar ɗaukar na'urarka ko nuna PPI don gane yadda babban hoton da kake buga zai kasance a takarda.

Duk abin da kake buƙatar sani shi ne bayanin da yake cikin hotunan kanta - girman pixel da aka kwance , da nau'in pixel a tsaye , da kuma PPI na hoton .

Dukkanin bayanai guda uku suna samuwa a cikin siffofin hotunan da za ka iya samun a cikin shirin gyaran gyare-gyare naka.

Ga ayoyin:

hsize = w / ppi vsize = h / ppi

... inda zane da vsize su ne siffar ta kwance da tsaka-tsalle a cikin inci, bi da bi, kamar yadda za a buga su, w shine nisa na hoton a pixels, h shine tsawo na hoton a pixels, kuma ppi shine PPI na hoton da kansa.

Ga yadda kake yin hakan idan hotonka ya kasance 375x148 pixels a girman kuma yana da PPI na 72:

1. Raba nisa daga PPI: 375/72 = 5.21 "
2. Raba tsawo ta PPI: 148/72 = 2.06 "

Yayin da kake zaton ba zazzage hoton ba yayin aiwatar da bugu, za a buga hotunan a cikin girman 5.21 "ta hanyar 2.06". Yi math tare da hoton da kake da shi sannan kuma buga shi - yana aiki kowane lokaci!

Lura: An saita siginar DPI akan buƙatarku a, watau 300, 600, 1200, da dai sauransu, bazai tasiri girman da aka buga hotunan a! Wannan lambar tana da kama da PPI kuma yana wakiltar "ingancin" wanda aka aika da hoton da aka aika zuwa firin ta amma amma ba za a haɗa shi a matsayin ɓangare na girman girman girman hotonku ba.

Rubutun Kuɗi ta Pixels

Kamar yadda aka yi alkawari a sama, a nan ne PPI "takardun fim din" wanda ya kamata ya cece ku matakan matakan da muka nuna a sama.

Girman (a)	8K UHD (7680x4320)	4K UHD (3840x2160)	Full HD (1920x1080)
145	60.770	30.385	15.192
110	80.106	40.053	20.026
85	103.666	51.833	25.917
84	104.900	52.450	26.225
80	110.145	55.073	27.536
75	117.488	58.744	29.372
70	125.880	62.940	31.470
65	135.564	67.782	33.891
64.5	136.614	68.307	34.154
60	146.860	73.430	36.715
58	151.925	75.962	37.981
56.2	156.791	78.395	39.198
55	160.211	80.106	40.053
50	176.233	88.116	44.058
46	191.557	95.779	47.889
43	204.922	102.461	51.230
42	209.801	104.900	52.450
40	220.291	110.145	55.073
39	225.939	112.970	56.485
37	238.152	119.076	59.538
32	275.363	137.682	68.841
31.5	279.734	139.867	69.934
30	293.721	146.860	73.430
27.8	316.965	158.483	79.241
27	326.357	163.178	81.589
24	367.151	183.576	91.788
23	383.114	191.557	95.779
21.5	409.843	204.922	102.461
17.3	509.343	254.671	127.336
15.4	572.184	286.092	143.046
13.3	662.528	331.264	165.632
11.6	759.623	379.812	189.906
10.6	831.286	415.643	207.821
9.6	917.878	458.939	229.469
5	1762.326	881.163	440.581
4.8	1835.756	917.878	458.939
4.7	1874.815	937.407	468.704
4.5	1958.140	979.070	489.535

Hakika, ba kowane na'urar ko nunawa ba akwai daidai 8K UHD , 4K UHD , ko Full HD (1080p) . Ga wata tebur tare da wasu na'urori masu amfani tare da shawarwari marasa daidaituwa da PPI na lissafi:

Na'urar	Girman (a)	Resolution (x / y)	PPI
Chromebook 11	11.6	1366x768	135.094
Chromebook Pixel	12.9	2560x1700	238.220
Chromebox 30	30	2560x1600	100.629
Dell Venue 8	8.4	1600x2560	359.390
Dell Venue 11 Pro	10.8	1920x1080	203.972
Muhimmancin waya	5.71	2560x1312	503.786
Google pixel	5	1080x1920	440.581
Google Pixel XL	5.5	1440x2560	534.038
Google pixel 2	5	1920x1080	440.581
Google Pixel 2 XL	6	2880x1440	536.656
Google Pixelbook	12.3	2400x1600	234.507
HTC One M8 / M9	5	1080x1920	440.581
iMac 27	27	2560x1440	108.786
iMac 5K	27	5120x2880	217.571
iPad	9.7	768x1024	131.959
iPad Mini	7.9	768x1024	162.025
iPad Mini Retina	7.9	1536x2048	324,51
iPad Pro	12.9	2732x2048	264.682
iPad Retina	9.7	1536x2048	263.918
iPhone	3.5	320x480	164.825
iPhone 4	3.5	640x960	329.650
iPhone 5	4	640x1136	325.969
iPhone 6	4.7	750x1334	325.612
iPhone 6 Ƙari	5.5	1080x1920	400.529
iPhone 7/8	4.7	1334x750	325.612
iPhone 7/8 Plus	5.5	1920x1080	400.528
iPhone X	5.8	2436x1125	462.625
LG G2	5.2	1080x1920	423.636
LG G3	5.5	1440x2560	534.038
MacBook 12	12	2304x1440	226.416
MacBook Air 11	11.6	1366x768	135.094
MacBook Air 13	13.3	1440x900	127.678
MacBook Pro 13	13.3	2560x1600	226.983
MacBook Pro 15	15.4	2880x1800	220.535
Nexus 10	10.1	2560x1600	298.898
Nexus 6	6	1440x2560	489.535
Nexus 6P	5.7	1440x2560	515.300
Nexus 9	8.9	2048x1536	287.640
OnePlus 5T	6.01	1080x2160	401.822
Samsung Galaxy Note 4	5.7	1440x2560	515.300
Samsung Galaxy Note 8	6.3	2960x1440	522.489
Samsung Galaxy S5	5.1	1080x1920	431.943
Samsung Galaxy S6	5.1	1440x2560	575.923
Samsung Galaxy S7	5.1	2560x1440	575.923
Samsung Galaxy S8	5.8	2960x1440	567.532
Samsung Galaxy S8 +	6.2	2960x1440	530.917
Sony Xperia Z3 Tablet	8	1920x1200	283.019
Sony Xperia Z4 Tablet	10.1	2560x1600	298.898
Surface	10.6	1366x768	147.839
Surface 2	10.6	1920x1080	207.821
Surface 3	10.8	1920x1080	203.973
Littafin Bayani	13.5	3000x2000	267.078
Surface Pro	10.6	1920x1080	207.821
Surface Pro 3	12	2160x1440	216.333
Surface Pro 4	12.4	2736x1824	265.182

Kada ku damu idan ba ku sami ƙuduri ko na'urarku ba. Ka tuna, za ka iya lissafin adadin nau'in pixels a cikin inch don na'urarka, komai girman ko ƙuduri, ta amfani da math da muka bayyana a sama.