Why PyAutoGui LocateOnScreen() only Returns None

Question

Here's the code that I'm trying to run:

import pyautogui
r=pyautogui.locateOnScreen('C:\Users\David\Desktop\index.png',grayscale=False)
print r

Solution 1

It has to be a pixel-perfect match in order to be found. To allow for any sort of deviance you can invoke a confidence parameter.

For example:

loc = pyautogui.locateOnScreen(image, grayscale=True, confidence=.5)

However, in order to use the confidence parameter you have to have opencv_python installed. This is easy to install with pip:

./python -m pip install opencv_python

After that is in place, you should be able to account for minor differences.

Solution 2

I was encountering the same problem, what I did is

import pyautogui 
r= None 
while r is None:
    r=pyautogui.locateOnScreen('C:\Users\David\Desktop\index.png',grayscale=False)
print r

I think its just because that it takes time to locate image. If you found a better solution share with me :)

Solution 3

I had the similar problem.

My fault was I had saved the compare picture as jpg first and then as png in MS paint.

Be sure to save the compare picture as png format. After this the Locate function worked for me.

Solution 4

I had same issue and kept returning None value.

I did several trials and found the solution for me. OS : MacOS

I saved photo with my system screenshot tool ( command+shift+5) and saved. it seems it's different pixel info as what it's displayed in my screen. Therefore I used pyautogui screenshot instead to save the photo which I wanted to.

pyautogui.screenshot('num7_.png', region=(260,360, 110, 100))

After that, it's working good regardless of grayscale parameter.

pyautogui.locateOnScreen('num7_.png')
Box(left=260, top=360, width=110, height=100)

Solution 5

I got this working by using the following:

r = None
while r is None:
    r = pyautogui.locateOnScreen('rbin.PNG', grayscale = True)
print icon_to_click + ' now loaded'

The key is to make grayscale = True.

View more solutions

Comments

[Sami Ahmed Siddiqui]

Please make sure you format your code next time using the editor tools. Backticks don't work for code blocks.

[Mihai Marinescu]

Doesn't work for me. I tried the following: 1. download the one image from here: automatetheboringstuff.com/chapter18 2. added the image in the same folder of the python code; 3. kept the window open and the console next to it; 4. waited and waited - the image isn't found. it returns none; working on windows 10

[Bentaye]

Please insert the images in the body of your answers instead of giving a link, this way if the link breaks, the answer can still be understood

[feltersnach]

@aroy you need to make grayscale = True and it will work.

[Mario Uvera]

This worked for me using Windows 10 Python version 3.9.6. actually it hangs a bit after using "While"

[Vincent Wen]

This answer resolve my problem, thanks a lot!

[Naeem Khan]

This does not really answer the question. If you have a different question, you can ask it by clicking Ask Question. To get notified when this question gets new answers, you can follow this question. Once you have enough reputation, you can also add a bounty to draw more attention to this question. - From Review