Exploring Image Filters in Xamarin iOS

Xamarin iOS and CoreImage

When writing for Xamarin iOS you can leverage the CoreImage framework to perform a wide array of image manipulation techniques. These techniques range from manipulating the image hue or colors to more advanced requirements such as facial detection. Xamarin boasts 50 photo filters available as a part of their iOS CoreImage implementation. These filters vary from image skewing and warping to those you’re probably familiar with through apps such as Instagram.

The code:

Let’s take a look at using these image filters inside of a Xamarin iOS application. Each of the filters is exposed in Xamarin iOS as a class. To get a full list you can explore them through Xamarin.iOS.CoreImage. This example will explore applying a vignette filter to an image on the device.

var uiImage = UIImage.FromFile ("yourPhoto.jpg");
var image = new CIImage (uiImage);

var vignette = new CIVignette()
{
    Image = image,
    Intensity = 2F,
    Radius = 10F,
};

CIImage output = vignette.OutputImage;
var context = CIContext.FromOptions(null);
var cgimage = context.CreateCGImage (output, output.Extent);
var ui = UIImage.FromImage (cgimage);
imgview.Image = ui;

As you can see with the example above using these filters is fairly easy inside Xamarin iOS. Here is a list of the available filters in CoreImage with example images as of this writing. You can also download a sample application that explores filters and more image manipulation techniques here.

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