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Monday, September 24, 2012

What is the Difference between Bitmap Check point & Image Check point in QTP?

There are two types of major check points that are provided by the quick test professional namely:
  1. Bit map check point and
  2. Image check point

What is Bitmap and Image Check Point?

- The expected bit map of an object is captured using the bitmap check point while the recording process is in progress. 
- While a run session is in progress and the actual bitmap matches, a pass to the test result is returned by the expected bitmap. 
- If the above is not the case, the test is said to have failed. 
- While the recording is in progress, it is better to insert the bitmap check point rather than inserting it in the active screen. 
- Inserting the check point in the active screen would pose the problem since the possibility is that the active screen may or may not have the latest bitmap updates and making changes to the screen at that time can cause the whole program to fail. 
- To know the difference in the scripts before and after inserting a check point, simply disable a button and run the script. 
- Then insert the check point, enable the button and run the script again. You would be able to see the difference for yourself. 
- For inserting the bitmap check point in to the test script open up a blank test in quick test professional and then open the application that you want to check and start recording. 
- You will get a record and run settings window, select the tab titled “windows application”, then “record and run test on any windows based application” and hit OK. 
- Go to the check point’s option in the insert menu and select the bitmap check point option and insert it where you want.  
- The bitmap check point properties can be changed. 
- Now when the test is run a pass in the test result is recorded by the quick test professional. 
- The basic use of the bitmap check points is in making comparisons between objects and images pixel by pixel. 
- The comparison is carried out for the following:
  1. RGB color variations and
  2. Total deviation in number of pixels.
- By matching the captured bitmaps one can the appearance of the elements in the application. 
- Bitmap check point has proved to be great help in checking bitmap of a full web page or an image. 
- On the other hand, an image check point cannot check the pixels and therefore it is basically employed in checking properties like source file location of a web site or web page. 
- The area of an application or a web page can be checked as a bitmap. 
- The area to be checked can be specified by selecting an object while creating a test. 
- The selected object is specified as a bitmap and then the check point can be inserted in the test. 
- This calls for a large disk space so in order to save space you have the option of saving only the selected area of the object.
- The bitmap check point also allows you to check the zooming property of the maps and they can be created for all supporting testing environments. 
- The results of the bit map check point may be affected by color settings, screen resolution and operating system but this is not so in the case of the image check points. 
- The properties of an image are verified by image check point under AUT whereas only an area of the AUT is verified as a bitmap by the bitmap checkpoint.  

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