How to take partial screenshot (frame) with Selenium WebDriver?

Question

Is it possible to take a screenshot with WebDriver of only one frame (not the complete window) within a frameset?

Alternatively, is it possible to define coordinate

Answer 1

Just posting a solution based on C# on taking a specific Html element's screenshot in selenium:

First we need to take the screen shot of entire web page using the GetScreenShot method of selenium web driver as below.

Screenshot screenshot = ((ITakesScreenshot)this.driver).GetScreenshot(); 
screenshot.SaveAsFile(filename, System.Drawing.Imaging.ImageFormat.Jpeg);

Then create a rectangle from the location , height and width of the specified html element. (This has to be obtained using FindElement() method of selenium by providing id or class name).

Image img = Bitmap.FromFile(uniqueName);
Rectangle rect = new Rectangle();

if (element != null)
{
    // Get the Width and Height of the WebElement using
    int width = element.Size.Width;
    int height = element.Size.Height;

    // Get the Location of WebElement in a Point.
    // This will provide X & Y co-ordinates of the WebElement
    Point p = element.Location;

    // Create a rectangle using Width, Height and element location
    rect = new Rectangle(p.X, p.Y, width, height);
}

Using this we are going to crop the the screenshot as below and the result will be the screenshot specific web element.

Bitmap bmpImage = new Bitmap(img);
var cropedImag = bmpImage.Clone(rect, bmpImage.PixelFormat);

Full code as a method below:

/// 

/// Captures the element screen shot.
/// 
/// The element.
/// Name of the unique.
/// returns the screenshot  image 
public Image CaptureElementScreenShot(HTMLElement element, string uniqueName)
{
    Screenshot screenshot = ((ITakesScreenshot)this.driver).GetScreenshot();
    screenshot.SaveAsFile(filename, System.Drawing.Imaging.ImageFormat.Jpeg);

    Image img = Bitmap.FromFile(uniqueName);
    Rectangle rect = new Rectangle();

    if (element != null)
    {
        // Get the Width and Height of the WebElement using
        int width = element.Size.Width;
        int height = element.Size.Height;

        // Get the Location of WebElement in a Point.
        // This will provide X & Y co-ordinates of the WebElement
        Point p = element.Location;

        // Create a rectangle using Width, Height and element location
        rect = new Rectangle(p.X, p.Y, width, height);
    }

    // croping the image based on rect.
    Bitmap bmpImage = new Bitmap(img);
    var cropedImag = bmpImage.Clone(rect, bmpImage.PixelFormat);

    return cropedImag;
}