Matlab Screen Size incorrect
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Trevor Harris am 23 Jan. 2015
Beantwortet: Petorr am 13 Dez. 2017
Seems as if with matlab 2014b the screen size query is off. Have a look at the attached screenshot. Obviously they disagree. Has anyone seen this before?
Michelle Hirsch am 26 Jan. 2015
Did you by chance change the screen resolution after starting MATLAB. The ScreenSize property is fixed when MATLAB starts up. If that's not it, I don't have any other ideas.
Guillaume am 23 Jan. 2015
Certainly don't know why the discrepancy.
If you do need the screen size in matlab, you could always go through .Net (Windows only), or java.
rect = System.Windows.Forms.Screen.PrimaryScreen.Bounds
screensize = [rect.Width rect.Height]
ge = java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment;
gd = ge.getDefaultScreenDevice;
screensize = [gd.getDisplayMode.getWidth gd.getDisplayMode.getHeight]
Guillaume am 12 Apr. 2016
Bearbeitet: Guillaume am 6 Mär. 2017
I suspect that Java is giving you the true screen size, whereas matlab and .Net is giving you the screen size scaled by the DPI scaling (under set custom text size in the display control panel) which you probably have set to 'Larger - 150%'.
A 'DPI aware' application should use the latter size because that's the size of the canvas that Windows provides to application for displaying stuff.
Image Analyst am 23 Jan. 2015
It's fine for me. It matches up fine.
Matt am 6 Mär. 2017
Bearbeitet: Matt am 6 Mär. 2017
Further to Guillaumes comment, which I hadn't actually seen.
I have just had this issue myself. Screensize returned a size in pixels/resolution of 1536x864 on a screen I knew was 1080p capable and set to 1920x1080 resolution.
I right clicked on my Matlab shortcut, and ticked "Disable Display Scaling on High DPI Settings" and now screensize is returned as 1920x1080 as I would expect.
Guillaume am 6 Mär. 2017
and now screensize is returned  as I would expect
Well, both results are actually as expected. When you have display scaling on, the effective resolution of 1536x864 pixels. That is, if you were to draw a rectangle that size in matlab it would fill up the screen. Windows rescale that rectangle to 1920x1080 to compensate for the higher DPI.
If you turn display scaling off, Windows does no virtualisation, so you indeed need 1920x1080 pixels to fill the screen. The downside is that text may be harder to read as it is smaller.
In the end, as I commented, the size reported by Matlab or .Net is the one you should use, regardless of the actual number of pixels of your screen. The size reported by Java is actually less useful.
Petorr am 13 Dez. 2017
I had a similar issue; I think it was because I un-docked my laptop and then re-docked it (I have a dual-monitor display dock), and the monitor info may have not updated accordingly. I restarted matlab and things returned to normal. I am using get(0,'MonitorPositions').
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