I would like to compare an image to the screen

Hi,

Could you please describe more generally what you want to achieve?

I would like to compare a pic with a on screen list and have a popup if the screen matches but I can not get the compare section correct. It always popups the screen matches even if it does not.

if exists("1442408970638.png"):
    popup("Screen matches!")
else:
    popup("Screen does not match.")

Is there another method I could use instead of exists to compare the screen to the picture?

You need to specify whether to determine a match with how the degree of similarity .

http://sikulix-2014.readthedocs.org/en/latest/pattern.html

excerpts from pattern.html:
Sikuli searches the region using a default minimum similarity of 0.7. This default value can be changed in Settings.MinSimilarity.
 The IDE supports adjusting the minimum similarity of captured images using the Preview Pane (internally in the script, the images are turned into a pattern object automatically).

example1(minimum similarity of 0.95):
if exists(Pattern("1442408970638.png").similar(0.95)):
    popup("Screen matches!")

example2(minimum similarity of 0.99):
if exists(Pattern("1442408970638.png").exact()):
    popup("Screen matches!")

What you suggested did not work so i tried this:

focusWindow = App.focusedWindow()
regionImage = capture(focusWindow)
img2=(regionImage)
file=open(r"C:\Sikuli\Test.txt",'a')
file.write(img2 + "\n")
img = (Pattern("1442500840276.png").similar(0.66))
if img == img2:
    file.write('Structures rolled correctly.\n')
    file.close()
else:
    file.write("Structure screen doesn't match.\n")
    file.close()

Even thought the images are exactly the same I still receive: ("Structure screen doesn't match.\n")
I want to capture what is on screen(img2) and compare it to a saved image(img).

Finder feature is helpful for this question.

http://sikulix-2014.readthedocs.org/en/latest/finder.html

capture is here:

http://sikulix-
2014.readthedocs.org/en/latest/screen.html#capturing