What did you do?

I have a large screen and i customed my win10 screen zooming on 125% , then i find that the function "ImageGrab" cannot work correctly,

What did you expect to happen?

I want get a screenshot of fullscreen, but it gave me part of it

What actually happened?

First I used default parameters，the function should have been given me a 1080p picture as my screen resolution, but only a 864p one, just topleft part of my screen. then i used some parameters in order to force set the function to give me screenshot on 1080p but the result is a picture seem like previous 864p picture with terrible black bar on right and below
it is obvious that 864p*125% =1080p, i think the reason caused this problem may concerned about the customed zooming of windows.

What are your OS, Python and Pillow versions?

• OS: win10 x64 with 125% zooming
• Python: 3.70
• Pillow: 5.00

Origin code：

def scanScreen(tpl):
    capture=ImageGrab.grab()
    capture.save('capture.png') 
    pic=cv2.imread('capture.png')
    return findPosition(pic,tpl)

Code can work correctly

I find another way to get my screenshot by use WinAPI，it is fast and always work correctly, code is here, hope helpful

import win32gui, win32ui, win32con, win32api
def window_capture(filename):
  hwnd = 0 # window ID , '0' means the activated window 
  #get Divice Context
  hwndDC = win32gui.GetWindowDC(hwnd)
  #get mfcDC
  mfcDC = win32ui.CreateDCFromHandle(hwndDC)
  saveDC = mfcDC.CreateCompatibleDC()
  # create bigmap for picture saving
  saveBitMap = win32ui.CreateBitmap()
  # get Moniter info
  MoniterDev = win32api.EnumDisplayMonitors(None, None)
  w = MoniterDev[0][2][2]
  h = MoniterDev[0][2][3]
  # print w,h　　　#picture size
  # create bitmap space
  saveBitMap.CreateCompatibleBitmap(mfcDC, w, h)
  # save the screenshot to saveBitmap
  saveDC.SelectObject(saveBitMap)
  # from topleft（0，0）to bottomright（w，h）
  saveDC.BitBlt((0, 0), (w, h), mfcDC, (0, 0), win32con.SRCCOPY)
  saveBitMap.SaveBitmapFile(saveDC, filename)