Weird rsults for the same image comparison using sikuli

I suppose, you are Programming in Java?

-- taking snapshots through Java API
I suppose you are using Java Robot?

-- Parts of the image which I am comparing is same in all four screens.
not really clear what that means?
I guess: SOME of the images are same .... ???

-- One image I am comparing with four screens
not really clear:
live-comparing on a four screen multi monitor system or screenshots from 4 different systems??

Are you using the similarity feature?

Thanks! for responding RaiMan,

yes I am programming in Java. And I am using robot to capture a screenshot.
I am doing a Multibrowser automation. My script will run on 3 browsers sequentially on same syatem.

Yes I tried both finder.find() method and Screen objects and pattern objects.

Using Finder object : I am trying something like this:

            String filePath ="drive path";
            function.Snapshot.Capture(filePath +"\\" +testCaseName+"_HomePageScreen"+".png"); // take the screen shot at run time and store in the drive
           String imgPathName = filePath +"\\" +testCaseName+"_HomePageScreen"+".png";
           finderObj = new Finder(imgPathName);
           finderObj.find("HeaderButtons.png",0.80); // Header.png image I am searching at Homepage screen with 80% ratio
            if (finderObj.hasNext()){
                 LOGGER.info("HeaderButtons : "+ browserName + " - Pass!");
            }else {
                  LOGGER.info("HeaderButtons :"+ browserName + " - Fail");
            }

Using Screen and Pattern object I tried this:-

// Navigate to that screen where we want to do comaprison
                 Pattern p1__s3_HeaderButton = new Pattern("Header.png "); // holds the drive path where pattern image exists
                 Screen screen = new Screen();

                  if(screen3.exists(p1__s3_HeaderButton.similar((float)0.80))!= null){
                          LOGGER.info("p1__s3_HeaderButton "+ browserName + " - Pass!");
                  }
                 else{
                          LOGGER.info("p1__s3_HeaderButton "+ browserName + " - Fail!");
                  }

Both the ways I am getting same results. I believe internally both finder.find() and pattern.similar() method call the same function.

My question was actually the image which I am comparing with all browsers is exacltly same. But why its failing I don't know reason for that. I am trying to find out something by doing variation in ratio.

Thanks,
Shilpi

________________________________________
From: <email address hidden> [<email address hidden>] on behalf of RaiMan [<email address hidden>]
Sent: Friday, July 06, 2012 5:45 PM
To: Shilpi Gupta (WT01 - ENU)
Subject: Re: [Question #202419]: Weird rsults for the same image comparison using sikuli

Your question #202419 on Sikuli changed:
https://answers.launchpad.net/sikuli/+question/202419

    Status: Open => Needs information

RaiMan requested more information:
I suppose, you are Programming in Java?

-- taking snapshots through Java API
I suppose you are using Java Robot?

-- Parts of the image which I am comparing is same in all four screens.
not really clear what that means?
I guess: SOME of the images are same .... ???

-- One image I am comparing with four screens
not really clear:
live-comparing on a four screen multi monitor system or screenshots from 4 different systems??

Are you using the similarity feature?

--
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https://answers.launchpad.net/sikuli/+question/202419

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-- yes the methods used internally to find an image or a pattern are the same

-- same image different browsers
since the browsers use different rendering engines (Safari/Chrome - webkit, FF - native, IE - native, ...) there might be differences on the pixel level especially with css-styled GUI elements (e.g. a button with css-styled border and shadow) with the same GUI-element in different browsers.
Soit might well be, that an image taken in IE does not match at all (similarity does not matter here really), because of major pixel-based references.
I once evaluated such a case, by taking a shot of the same element in different browsers and comparing the pixels visually with an image viewer magnified, so each pixel was visible.

Uuups, conclusion:

In many cases you need an image (sub) set for each browser.