Question: Suppose there is a frame with some image.I want to display only those parts which have pixel intensity above 120 or 130. How can I do that with OpenCv ? Is there any commands to do so?
Then i need to set those parts to some intensity of 190.

Answer: 
This should do the trick for you.

```
$('#dropdownID').val("Value to be selected");

```
If you want to set the default value and it is the first element, you can do:

```
$('#dropDown')[0].selectedIndex=0;

```