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Israel Omar
Asked: 2020-05-14 20:32:34 +0800 CST 2020-05-14 20:32:34 +0800 CST

How do you make filters to add them in an android application?

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I am doing a school project and I want to make an application similar to Instagram but simpler in which I can add a photo from my gallery or take it from my camera and once I have it I want to be able to put filters on it and save it I already solved the part of obtaining the photo but I don't know how the filters are made or how to integrate them in the application

android

1 Answers

  1. Best Answer

    To apply filters you must change the color parameters of each pixel that makes up the image.

    Try with that code extracted from SO

    Bitmap sourceBitmap = BitmapFactory.decodeFile(imgPath);
    float[] colorTransform = {
            0, 1f, 0, 0, 0, 
            0, 0, 0f, 0, 0,
            0, 0, 0, 0f, 0, 
            0, 0, 0, 1f, 0};

    ColorMatrix colorMatrix = new ColorMatrix();
    colorMatrix.setSaturation(0f); //Remove Colour 
    colorMatrix.set(colorTransform); //Apply the Red

    ColorMatrixColorFilter colorFilter = new ColorMatrixColorFilter(colorMatrix);
    Paint paint = new Paint();
    paint.setColorFilter(colorFilter);   

    Display display = getWindowManager().getDefaultDisplay(); 

    Bitmap resultBitmap = Bitmap.createBitmap(sourceBitmap, 0, (int)(display.getHeight() * 0.15), display.getWidth(), (int)(display.getHeight() * 0.75));            

    image.setImageBitmap(resultBitmap);

    Canvas canvas = new Canvas(resultBitmap);
    canvas.drawBitmap(resultBitmap, 0, 0, paint);

    And here a list of filters to apply using the color matrix

    A library with some pre-designed effects

    Update 2

    AndroidPhotoFilters library to implement some basic filters

    photofilter library https://github.com/mukeshsolanki/photofilter

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