Convert Pixels to Points

Question

I have a need to convert Pixels to Points in C   I ve seen some complicated explanations about the topic  but can t seem to locate a simple formula  Let s assume a standard 96dpi  how do I calulate this conversion

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System Drawing Graphics has DpiX and DpiY properties  DpiX is pixels per inch horizontally  DpiY is pixels per inch vertically  Use those to convert from points  72 points per inch  to pixels   Ex  14 horizontal points    14   DpiX    72 pixels

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Try this if your code lies in a form   Graphics g   this CreateGraphics    points   pixels   72   g DpiX  g Dispose

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Starting with the given    There are 72 points in an inch  that is what a point is  1 72 of an inch  on a system set for 150dpi  there are 150 pixels per inch  1 in   72pt   150px   for 150dpi setting    If you want to find  points  pt  based on pixels  px     72 pt    x pt ------   -----                   1  for 150dpi system 150 px    y px   Rearranging   x    y 150    72                 2  for 150dpi system   so   points    pixels   150    72     3  for 150dpi system

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points    pixels   96    72 on a standard XP Vista 7 machine  factory defaults   points    pixels   72    72 on a standard Mac running OSX  Factory defaults   Windows runs as default at 96dpi  display  Macs run as default at 72 dpi  display   72 POSTSCRIPT Points   1 inch 12 POSTSCRIPT Points   1 POSTSCRIPT Pica 6 POSTSCRIPT Picas   72 Points   1 inch  1 point   1 72 inches   25 4 72 mm   0 3527 mm  DPI    Dots Per Inch PPI   Pixels Per Inch LPI   Lines per inch  More info if using em as measuring  16px   1em  default for normal text  8em   16px   8 Pixels 16   em

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WPF converts points to pixels with the System Windows FontSizeConverter  The FontSizeConverter uses the System Windows LengthConverter  The LengthConverter uses the factor 1 333333333333333333 to convert from points  p  to pixels  x   x   p   1 3333333333333333

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Height lines converted into points and pixel  my own formula   Here is an example with a manual entry of 213 67 points in the Row Height field   213 67  Manual Entry       0 45  Add 0 45     214 12  Subtotal     213 75  Round to a multiple of 0 75  213 00  Subtract 0 75 provides manual entry converted by Excel   284 00  Divide by 0 75 gives the number of pixels of height   Here the manual entry of 213 67 points gives 284 pixels  Here the manual entry of 213 68 points gives 285 pixels    Why 0 45  I do not know but it works

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Assuming 96dpi is a huge mistake   Even if the assumption is right  there s also an option to scale fonts   So a font set for 10pts may actually be shown as if it s 12 5pt  125

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This works   int pixels    int   dp    Resources System DisplayMetrics Density   0 5f

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Using wxPython on Mac to get the correct DPI as follows      from wx import ScreenDC     from wx import Size      size  Size   ScreenDC   GetPPI       print f x-DPI   size GetWidth    y-DPI   size GetHeight       This yields  x-DPI  72 y-DPI  72 Thus  the formula is  points  int    pixelNumber   72     72

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Surely this whole question should be    How do I obtain the horizontal and vertical PPI  Pixels Per Inch  of the monitor    There are 72 points in an inch  by definition  a  point  is defined as 1 72nd of an inch  likewise a  pica  is defined as 1 72nd of a foot   With these two bits of information you can convert from px to pt and back very easily

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Actually it must be  points   pixels   96   72

User · Answer

There are 72 points per inch  if it is sufficient to assume 96 pixels per inch  the formula is rather simple   points   pixels   72   96  There is a way to get the configured pixels per inch of your display in Windows using GetDeviceCaps   Microsoft has a guide called  Developing DPI-Aware Applications   look for the section  Creating DPI-Aware Fonts    The W3C has defined the pixel measurement px as exactly 1 96th of 1in regardless of the actual resolution of your display  so the above formula should be good for all web work

[c#] Convert Pixels to Points

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