Hi-DPI not correctly detected in Windows 10

General informations:

• OS name: Windows
• OS version: 10, version 1709
• OS architecture: 64 bits
• Resolutions:
  • Monitor 1: 3840x2160
  • Monitor 2: 3840x2160
• Python version: 3.6.1
• MSS version: 3.2.0

Description of the warning/error

I have two monitors, both 3840x2160. My scaling is 200%. Screenshotting either one individually, or both together crops the right and bottom sides. I get two 2880x1620 images, or one 5760x1620.

monitors returns these values:

>>> for m in sct.monitors:
    print(m)

{'left': 0, 'top': 0, 'width': 5760, 'height': 1620, 'scale': 1.5}
{'left': 0, 'top': 0, 'width': 2880, 'height': 1620, 'scale': 1.5}
{'left': 2880, 'top': 0, 'width': 2880, 'height': 1620, 'scale': 1.5}

Other details

Dividing the resolution by 1.5 and multiplying by 2 gives the correct resolution - it seems to just be detecting the scaling incorrectly. I think this is related to #20.

[ryanfox]

I found a workaround - you need to make Python DPI-aware:

import ctypes
ctypes.windll.user32.SetProcessDPIAware(1)

Executing that before creating the sct object gives me full-resolution screenshots of both monitors.

[ryanfox]

If I manually specify the resolution, it captures the full desktop across both monitors:

sct.grab({'left': 0, 'top': 0, 'width': 7680, 'height': 2160, 'scale': 2})

lets me save the full image.