locateOnScreen not working on Big Sur

After upgrading to macOS Big Sur, the function locateOnScreen is unable to find any image.

Steps to reproduce:

• Make sure “myimage.png” is visible on screen
• run this code pyautogui.locateOnScreen("myimage.png")

Expected result:

The position is returned by the function.

Actual result:

None is returned by the function.

[rez1-inf]

@cj81499 i agree… this workaround could easily be implemented as a fix… but PyAutoGUI uses PyScreeze by the same author to do most of the work… and nobody seems to be updating that anymore… I’ll try implementing the fix there and do a pull request sometime soon… let’s see if that’ll work…

Edit: actually this workaround can’t be a fix… (or shouldn’t be)… because then every time a user tries to locate something on screen, it would take a screen shot twice… once for the ratio and once to locate…

so a deeper dive into the source code is necessary… take screen shot just once and use it for both measuring pixel ratio and location…

If someone who already worked on this code was aware of this issue, could have easily implemented the fix…

[cj81499]

@rez1-inf I think the point is that this is really something the library ought to handle for the user. Correcting for display scaling is not something that I want to spend any time thinking about as a developer trying to throw some GUI automation together. While the workaround you linked is useful, this is still a BIG usability issue imo. At the very least, it should be documented clearly that such a workaround is needed for displays with scaling.