Java
None

PhotoFiltersSDK

PhotoFiltersSDK aims to provide fast, powerful and flexible image processing instrument for creating awesome effects on any image media.

Library supports OS on API 15 and above.

Features

PhotoFiltersSDK processes filter on any Image within fraction of second since processing logic is in NDK. At present following image filters are included:

• ToneCurveSubfilter : With this powerful filter you can change RGB channels of any image to create great results.
• SaturationSubfitler : Used for changing color saturation of an image.
• ColorOverlaySubfilter : As name suggests you can overlay any image with color of your choice.
• ContrastSubfilter : Used for changing contrast value of image.
• BrightnessSubfilter : To change brightness levels.
• VignetteSubfilter : To apply vignette effect on image.

Library also comes with inbuilt Sample Filters (Refer SampleFitlers.java). Implementation is straightforward:

Filter fooFilter = SampleFilters.getBlueMessFilter();
Bitmap outputImage = fooFilter.process(inputImage);

Implementation

Adding Dependency

Include photofiltersdk in your settings.gradle like this :

include ':photofilterssdk'

Add dependency in your build.gradle :

compile project(':photofilterssdk')

Load native library in your activity :

public class MainActivity extends AppCompatActivity {
    static
    {
        System.loadLibrary("NativeImageProcessor");
    }
    ...

Usage

Filter myFilter = new Filter();
myFilter.addSubFilter(new BrightnessSubFilter(30));
myFilter.addSubFilter(new ContrastSubFilter(1.1f));
Bitmap outputImage = myFilter.process(inputImage);

Above code snippet will give you outputImage with increased brightness and contrast. You can further refer example project.

Documentation

Although there are few inbuilt filters already present, you may want to create and customize one specific to your need and show your creativity. For that you would require to know how all the Subfilters can be used. Let me take you through all of them.

ToneCurveSubfilter

Here is the code snippet the apply the above RGB curve on an image :

Filter myFilter = new Filter();
Point[] rgbKnots;
rgbKnots = new Point[3];
rgbKnots[0] = new Point(0, 0);
rgbKnots[1] = new Point(175, 139);
rgbKnots[2] = new Point(255, 255);

myFilter.addSubFilter(new ToneCurveSubfilter(rgbKnots, null, null, null));
Bitmap outputImage = myFilter.process(inputImage);

The results are nearly same as we would see in photoshop and other tools. We can also specify knots for Red, Green and Blue channels (in the ToneCurveSubfilter's constructor).

SaturationSubfilter

Filter myFilter = new Filter();
myFilter.addSubFilter(new SaturationSubfilter(1.3f));
Bitmap outputImage = myFilter.process(inputImage);

ColorOverlaySubfilter

Filter myFilter = new Filter();
myFilter.addSubFilter(new ColorOverlaySubfilter(100, .2f, .2f, .0f));
Bitmap outputImage = myFilter.process(inputImage);

ContrastSubfilter

Filter myFilter = new Filter();
myFilter.addSubFilter(new ContrastSubfilter(1.2f));
Bitmap outputImage = myFilter.process(inputImage);

BrightnessSubfilter

Filter myFilter = new Filter();
myFilter.addSubFilter(new BrightnessSubfilter(30));
Bitmap ouputImage = myFilter.process(inputImage);

VignetteSubfilter

Filter myFilter = new Filter();
myFilter.addSubFilter(new VignetteSubfilter(100));
Bitmap outputImage = myFilter.process(inputImage);

License

This library falls under Apache v2