But we do not take into account that the graphical elements may be smaller according to actual DPI of the screen. The conclusion from this is that it is possible to avoid inconsistency in the display by fixing font sizes. Note that in fact, the size in points of the font has changed. The title bar is bigger, but the client area and the font size is the same. Now if the same program is run at 120 DPI (125%), it becomes : If we try again with a fixed font size of 9 points, then at 96 DPI (100%), we get this : So if we set the font size, it will be fixed to a certain size in pixels. In fact, only the value of Font.Height is stored, and Font.Size changes according to current DPI value. Note that Font.Size is expressed in points and Font.Height is expressed in pixels. To avoid this, you must set the font size to a non-zero value. Note that these changes in size can occur by using an application with a different Windows theme, or with another operating system. The window title gets bigger, but the client area of the window remains the same size. It has been designed at 96 DPI (100%), and it looks like this :Īs you can see, the font gets bigger and so the text is clipped. ![]() Here is a form with an undefined font size (set to zero, which is the default value). Change fixed 96dpi on Ubuntu with high DPI LCD.To preserve setting after reboot you need to add the command as script to /etc/X11/Xsession.d/77set_dpi. You can discover your current monitor DPI by command: ![]() On Linux DPI setting is more complicated and depends on used software and their version. We're talking here about desktop applications. Remember that under Windows 10 there are Universal Applications (WinRT) and the classic desktop applications (Win32). So, instead of changing the size of all elements in desktop, this will change just the font size (And of course everything else is changed to fit). The DPI option is not recommended, but still there. Ensure you test twice in order to check if everything works under different sizes. You can have different font sizes for each element: Title bar, Menu, Dialog box and so on. Windows 10 "Control Panel > Appearance and Personalization > Display" have more options. You can also set your custom DPI setting via the option "Set custom text size (DPI)" and enable/disable the DPI Virtualization.įor Windows 8 Metro Applications read this Windows 10 If you select 150% (144 DPI) the option "Use Windows XP style DPI scaling" is disabled (DPI Virtualization is enabled), and applications you run under this setting must be High DPI Awareness to prevent system scaling which will produce a blurred image. Applications you run under this setting are scaled as if running under Windows XP. If you select 125% (120 DPI) the option "Use Windows XP style DPI scaling" is enabled. If you select 100% (96 DPI) this is the default Windows DPI setting, (High DPI is not the default). Select Smaller 100% (default), Medium 125% or Larger 150%. In Windows 7 go to "Control Panel > Appearance and Personalization > Display" (or just Control Panel > Display in recent updates). High DPI awareness means that an application takes this DPI setting into account. High DPI means any custom DPI setting with more than 96 DPI (the default setting) *. On Windows 95 and later, it is possible to change the DPI ratio to make elements bigger. (See: DPI auto-adjustment and absolute layout auto-adjustment)įor example 300 DPI means that there are 300 pixels (or dots) per inch.In addition to basic application DPI awareness you can add own DPI options to your application to allow users to set custom per application DPI to overcome wrong system DPI setting. Usually DPI is presented as one value but it can be different for horizontal and vertical axes if pixel is not square. ![]() But the physical DPI is not used automatically by system so if you connect video output to monitor with different size then sceen resolution and visual size of controls are not automatically changed. The physical DPI can be determined from display through EDID protocol from physical size data and actual resolution. Most of today operating systems use default DPI set to 96 and allow to change it to higher value manually. In this second case, sizes are given in points. Applications can either use pixel sizes, or take into account the actual display size. Here dot is an equivalent for pixel in printing terminology. 3.2 DPI Aware Application (For Vista +)ĭPI (Dots Per Inch) is the relation between size in pixels and the actual display size.
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