When i try to use Regions.Compare method to compare the Stored Image with Active Window Image, always i got the failure message due to pixel difference. If i set the tolerance with the high value, it's passed.How do i find the optimum value for the tolerance parameter? Generally how do they compare Logo's displayed in the web pages using TestComplete?
In what format is the picture stored in Regions? There can be problems with compressing it if it's not BMP.
Please take a picture of the logo, save it in the BMP format and try to reproduce the problem in this case. If this doesn't help, post here your script and the pictures you are comparing (one from Regions and the other one taken from the screen).
This should show you where the difference is between the two pictures. If could be something like a pixel or two, which could be resolved by increasing the Tolerance a little. It could also be your Mouse setting. If it's in one picture and not another.