Sending a base64 data image via form POST

Question

I have two images in the form of (somewhat):

<img src="data: base64, OIJQWEFOIJQWEFOIJQWEF..." />
<img src="data: base64, OIJQWEFOIJQWEFOIJQWEF..." />

I have no choice in the matter, these images are always going to be set as base64 data.

If I were to POST these using some client side magic, how can I convert the strings to actual images?

public ActionResult Combine(string imageA, string imageB)
{
    // imageA and imageB would be the strings.
    return View();
}

Answer 1

Use Convert.FromBase64String method.
This method:

Converts the specified string, which encodes binary data as base-64 digits, to an equivalent 8-bit unsigned integer array.

Then you can use WebImage class from System.Web.Helpers.dll assembly to convert byte array to actual image and perform some manipulations on it.