In theory, the DPI property provided by the display should allow
applications to be scaled to be usable on all kinds of display.
But in practice, not many applications are doing this scaling and even
more worse, some desktop environments (at least gnome) overwrite the DPI
value arbitrarily, breaking those scaling mechanisms. Additionally,
LibreOffice and PDF viewers show wrong document sizes because of this.

Regards,
Markus


Am 31.10.2012 23:30, schrieb kcle...@users.sourceforge.net:
> Most existing screen have a pixel density of 40 ppcm.  However the Apple
> retina screen has 80ppcm, and with a resolution of 2880x1800.
> 
> Obviously, photographers would like to make the full use of the native
> resolution on the screen!   But in most applications, when the OS switches
> to the native resolution, all icons and font would become ridiculously
> small.  Does darktable currently have a "high pixel density mode" where the
> icons and the UI are scaled up, *but without scaling the photo pixels so
> that all photo pixels are displayed as it is*?  For example, in a normal
> display, if one need to scale down a photo by 4, then on a retina display,
> the same photo would only need to be scaled down by 2 in the same display
> setting.
> 
> 
> 
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