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GetSystemMetrics module returns wrong screen resolution after running sct.grab(monitor)

See original GitHub issue

General information:

  • OS name: Windows 10

  • OS version: 20H2

  • OS architecture: 64 bits

  • Resolutions:

    • Monitor 1: 2560x1600(Scale is 175% and the resolution after it is 1463x914)
  • Python version: 3.8.5

  • MSS version: 6.1.0

Description of the warning/error


Full message


Other details

First python code is below:

from win32.win32api import GetSystemMetrics
w = GetSystemMetrics (0)
h = GetSystemMetrics (1)

It can return the right resolution: 1463x914

Second python code is below:

from win32.win32api import GetSystemMetrics
import mss

left, top, right, bottom = (100,100,900,700)
with mss.mss() as sct:
    # Part of the screen to capture
   monitor = {'top': top, 'left': left, 'width': right-left, 'height': bottom-top}
   world_sct = np.array(sct.grab(monitor))

w = GetSystemMetrics (0)
h = GetSystemMetrics (1)

It returns: 2560x1600

GetSystemMetrics gives the wrong resolution after taking a screen shot by mss

Issue Analytics

  • State:open
  • Created 3 years ago
  • Comments:7 (5 by maintainers)

github_iconTop GitHub Comments

narumi147commented, Dec 17, 2020

mss instance will set High DPI awareness = PROCESS_PER_MONITOR_DPI_AWARE. So before using mss, the PROCESS is NOT DPI aware, you got 1463x914. Once mss instance created, the PROCESS is DPI aware, then you got the actual resolution 2560x1600.

What’s more, during the full lifecycle of PROCESS, DPI awareness can be only set once programmatically or in manifest. Although Windows10 introduces Mixed-Mode DP-aware and support THREAD DPI awareness?

For more details:

BoboTiGcommented, Dec 15, 2020

Also, the latest release is 6.1.0. 3.2.0 is quite old.

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