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DPI for Most Common Resolutions Warning: depending on the style used, the table below may appear mangled. Just copy and paste the content into a monospaced text editor. Code:
HPi VPi HRa VRa CN NPi -------------------------------------------------------------------------- SS ---------------------------------------------------------------------------------------- 10 10,1 11 11,1 12 12,1 13 13,3 14 14,1 15 15,1 15,4 16,1 17 19 20 20,1 22 24 30 640 480 4 3 VGA 307.200 080,00 079,21 072,73 072,07 066,67 066,12 061,54 060,15 057,14 056,74 053,33 052,98 051,95 049,69 047,06 042,11 040,00 039,80 036,36 033,33 026,67 800 600 4 3 SVGA 480.000 100,00 099,01 090,91 090,09 083,33 082,64 076,92 075,19 071,43 070,92 066,67 066,23 064,94 062,11 058,82 052,63 050,00 049,75 045,45 041,67 033,33 1024 768 4 3 XGA 786.432 128,00 126,73 116,36 115,32 106,67 105,79 098,46 096,24 091,43 090,78 085,33 084,77 083,12 079,50 075,29 067,37 064,00 063,68 058,18 053,33 042,67 1152 864 4 3 XGA+ 995.328 144,00 142,57 130,91 129,73 120,00 119,01 110,77 108,27 102,86 102,13 096,00 095,36 093,51 089,44 084,71 075,79 072,00 071,64 065,45 060,00 048,00 1280 800 16 10 WXGA 1.024.000 150,94 149,45 137,22 135,99 125,79 124,75 116,11 113,49 107,82 107,05 100,63 099,96 098,02 093,75 088,79 079,44 075,47 075,10 068,61 062,89 050,31 1280 1024 5 4 SXGA 1.310.720 163,92 162,30 149,02 147,68 136,60 135,47 126,09 123,25 117,09 116,26 109,28 108,56 106,44 101,81 096,42 086,27 081,96 081,55 074,51 068,30 054,64 1366 768 16 9* WXGA 1.049.088 156,71 155,16 142,46 141,18 130,59 129,51 120,55 117,83 111,94 111,14 104,47 103,78 101,76 097,34 092,18 082,48 078,36 077,97 071,23 065,30 052,24 1400 1050 4 3 SXGA+ 1.470.000 175,00 173,27 159,09 157,66 145,83 144,63 134,62 131,58 125,00 124,11 116,67 115,89 113,64 108,70 102,94 092,11 087,50 087,06 079,55 072,92 058,33 1440 900 16 10 WXGA+ 1.296.000 169,81 168,13 154,37 152,98 141,51 140,34 130,62 127,68 121,29 120,43 113,21 112,46 110,27 105,47 099,89 089,37 084,91 084,48 077,19 070,75 056,60 1680 1050 16 10 WSXGA+ 1.764.000 198,11 196,15 180,10 178,48 165,09 163,73 152,40 148,96 141,51 140,51 132,08 131,20 128,65 123,05 116,54 104,27 099,06 098,56 090,05 082,55 066,04 1600 1200 4 3 UXGA 1.920.000 200,00 198,02 181,82 180,18 166,67 165,29 153,85 150,38 142,86 141,84 133,33 132,45 129,87 124,22 117,65 105,26 100,00 099,50 090,91 083,33 066,67 1920 1080 16 9 WUXGA 2.073.600 220,29 218,11 200,26 198,46 183,58 182,06 169,45 165,63 157,35 156,23 146,86 145,89 143,05 136,83 129,58 115,94 110,15 109,60 100,13 091,79 073,43 1920 1200 16 10 WUXGA 2.304.000 226,42 224,17 205,83 203,98 188,68 187,12 174,17 170,24 161,73 160,58 150,94 149,94 147,02 140,63 133,19 119,17 113,21 112,64 102,92 094,34 075,47 2048 1536 4 3 QXGA 3.145.728 256,00 253,47 232,73 230,63 213,33 211,57 196,92 192,48 182,86 181,56 170,67 169,54 166,23 159,01 150,59 134,74 128,00 127,36 116,36 106,67 085,33 2560 1600 16 10 WQXGA 4.096.000 301,89 298,90 274,44 271,97 251,57 249,49 232,22 226,98 215,63 214,10 201,26 199,93 196,03 187,51 177,58 158,89 150,94 150,19 137,22 125,79 100,63 2560 2048 5 4 QSXGA 5.242.880 327,84 324,59 298,04 295,35 273,20 270,94 252,18 246,50 234,17 232,51 218,56 217,11 212,88 203,63 192,85 172,55 163,92 163,10 149,02 136,60 109,28 3840 2400 16 10 WQUXGA 9.216.000 452,83 448,35 411,66 407,96 377,36 374,24 348,33 340,47 323,45 321,16 301,89 299,89 294,05 281,26 266,37 238,33 226,42 225,29 205,83 188,68 150,94 * The number used to calculate is, in fact, 8.996, because this is the true aspect for that screen. The number 9 is shown only because it's readily recognizable for the 1366x768 resolution. HPi : Number of horizontal pixels VPi : Number of vertical pixels HRa : Horizontal ratio VRa : Vertical ratio CN : Common name NPi : Number of pixels on the whole screen SS : Screen size Methodology: 1) NPi = HPi * VPi 2) DPI = HPi / ((SQUARE_ROOT((SS^2)/((HRa^2)+(VRa^2))))*HRa) Notes: 1) As you can see, the math for the DPI relies mostly on the horizontal dimensions rather than vertical dimensions. That is recommended since it does not matter choosing one or another, because the pixels are square. 2) Remember that those are unidimensional numbers. If you want to know 'how bigger things will appear on screen A compared to screen B", you will need to square the numbers and, only then, you will be able to compare (area is bidimensional). Sounds obvious, but it happened to me once. Any questions or corrections, please let me know. This was motivated by the countless pixels/dpi/resolution questions. Last edited by DDDa; 08-13-2008 at 07:40 PM. |
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