UseScreenFactor and desktop resolution

ROOT
1

Hi,

I would like to make some high resolution png-files in root, so that they still look nice in print. In order to do that I make the canvas size bigger than my desktop resolution (1440 x 900), but the canvas automatically gets resized to fit the screen. However, if I do “gEnv->Print()”, Root claims that the relevant parameter “Canvas.UseScreenFactor” is false. How can I avoid this behaviour? Or explicitly remind Root not to resize?
(I’m running Root 5.26 from the downloaded binary on Mac Os X with X11, but I also had the problem on Linux)

I played around a bit and discovered the following weird behaviour:

  • If I ask my macro to save the canvas automatically, the saved png-file will contain the large canvas (as I want), but also has the resized canvas on top of it. (see attachment)
  • If I change the resolution of my desktop to for example 800 x 600, the canvas no longer fits the screen (that’s good), but nonetheless was rescaled to 1440 x 900. So, which other settings did I miss?

Thanks,
Kristof
Test.C (410 Bytes)

Test.png2696×2372 38.9 KB

2

Did you try saving as PDF?

Cheers, Fons.

3

The problem doesn’t occur in PDF, but for PDF’s it is not necessary to make the Canvas size that big to get better resolution.

I’m using png-files as I still need to edit them later, with for example Gimp. Why? Because according to http://root.cern.ch/phpBB3/viewtopic.php?f=3&t=11411&start=0&hilit=legend it is not yet possible to get the correct labels in TLegend with RooPlots, so I have to do that by hand. (but that’s unrelated here)

4

Yes, but once in PDF you can use many tools to re-save the file in a large PNG or other format.

Cheers, Fons.