Question

I apply sepia effect on image but when I click on button to apply its done but after 90 sec .

public static Bitmap effect(Bitmap src, int depth, double red, double green, double blue) 
{

        int width = src.getWidth();
        int height = src.getHeight();
        Bitmap bmOut = Bitmap.createBitmap(width, height, src.getConfig());
        final double GS_RED = 0.3;
        final double GS_GREEN = 0.59;
        final double GS_BLUE = 0.11;

        int A, R, G, B;
        int pixel;


        for(int x = 0; x < width; ++x) {
            for(int y = 0; y < height; ++y) {

                pixel = src.getPixel(x, y);

                A = Color.alpha(pixel);             
                R = Color.red(pixel);
                G = Color.green(pixel);
                B = Color.blue(pixel);

                B = G = R = (int)(GS_RED * R + GS_GREEN * G + GS_BLUE * B);

                R += (depth * red);
                if(R > 255) { R = 255; }

                G += (depth * green);
                if(G > 255) { G = 255; }

                B += (depth * blue);
                if(B > 255) { B = 255; }
                bmOut.setPixel(x, y, Color.argb(A, R, G, B));
                   }}

    return bmOut;
}

Answer 1

Oh, it appears that you are using the sample code on my blog: http://xjaphx.wordpress.com/2011/06/21/image-processing-photography-sepia-toning-effect/
The article means to demonstrate the how to implement the algorithm, so it certainly doesn’t mention anything else.

As for performance problem, I suggest:

1. If you develop under Application Level (Java code..), use getPixels() setPixels() and manipulate the two-dimensional array. Well, in this sepia-toning, it might be up to only 5-10 seconds on emulator, on real device it might be 3 seconds.

2. It’s preferable to do all image processing stuffs on NDK (like creating image processing library..), it will process much faster.

Anyway, have fun!