In this recipe, we'll learn how one can apply a custom photo effect to images from Gallery. We will implement a "retro" filter with OpenCV, so that the photographs look old, as shown in the following screenshot:
The source code for this recipe can be found in the
Recipe07_ApplyingRetroEffect folder in the code bundle that accompanies this book. You can use the iOS Simulator to work on this recipe.
This recipe heavily relies on the previous one, as we're going to implement the same workflow: loading images from Gallery, processing them with OpenCV, and displaying them on the screen. ...