How to Add Hue Effect on UIImage by modifying Pixel Value of Image in iPhone App

Question

want to add hue filter in iPhone app I want to write a code to add Hue Image Effect with different parameter value of Hue value by modifying the pixel value of Image. How can I do this. Overall I want to add Hue Image Filter by manipulating each Pixel value of Image. But waht the actual value for Pixel in adding Hue effect.

Answer 1

You need to use CoreImage for that, specifically a CIFilter. There are plenty of examples online, but there's one in the apple developer website that matches exactly what you want:

Go to here and check the section "Creating a CIFilter Object and Setting Values", there it shows how to create a hue filter for a given image.