Instagram Image Filters on iPhone

Question

How can I add image filters to the iPhone app? (similar to what Instagram and picplz have)

Answer 1

People,

I tried to replicate instagram and photoshop filters using pure CoreGraphics and direct pixel manipulation without using OpenGL.

Find this project at:

https://github.com/esilverberg/ios-image-filters

** UPDATE **

You should also consider this project: https://github.com/gobackspaces/DLCImagePickerController

Answer 2

Have you tagged simple-iphone-image-processing ? This is a “simple C ++ class with an Objective-C wrapper that provides a set of common image processing tasks,” as well as a UIImage transform. It provides:

• Cross-Edge Detection
• Histogram equalization
• Skeletonization
• Thresholding , adaptive and global
• Gaussian blur (used as a preprocessing step to detect canny edge)
• Brightness normalization
• retrieving a connected region
• Resize - Using Interpolation

Other open source C ++ libraries:

• http://cimg.sourceforge.net/
• http://filters.sourceforge.net/

Edit Also, look at this open source code - https://github.com/OmidH/Filtrr

Answer 3

Unfortunately, there is no CoreImage library in the iOS SDK, so you need to use OpenGLES for image processing, Apple has an example application that demonstrates several methods.

http://developer.apple.com/library/ios/#samplecode/GLImageProcessing/Introduction/Intro.html

Answer 4

I think you can also port, most of the C code, from free image processing libraries. And then use pixel based changes.