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: 
```
$("#dropDownItems").val("--Select--");

```

Or, if you just want to select the first option regardless of its value, you can define this helper function:

```
$.fn.selectFirst = function () {
    return $(this).find("option:first").attr("selected", "selected").end();
}

```

Then use it like this:

```
$("#dropDownItems").selectFirst();

```
try this

```
$('[id*=_dropdown]').val("--Select--");

```