get Color Histogram from Bitmap - Android android.graphics

Android examples for android.graphics:Bitmap Operation

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  4. Bitmap Operation

Description

get Color Histogram from Bitmap

Demo Code

import android.graphics.Bitmap;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.lemon.assist.Base64;
import android.lemon.dct.FDCT;
import android.view.View;
import android.view.View;
import android.widget.ImageView;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

public class Main{

    public static int[] getColorHistogram(Bitmap bitmap) {

        int width = bitmap.getWidth();
        int height = bitmap.getHeight();

        int[] areaColor = new int[64];

        for (int i = 0; i < width; i++) {
            for (int j = 0; j < height; j++) {
                int pixels = bitmap.getPixel(i, j);
                int alpha = (pixels >> 24) & 0xFF;
                int red = (pixels >> 16) & 0xFF;
                int green = (pixels >> 8) & 0xFF;
                int blue = (pixels) & 0xFF;
                int redArea = 0;
                int greenArea = 0;
                int blueArea = 0;
                // 0-63 64-127 128-191 192-255
                if (red >= 192) {
                    redArea = 3;//w  ww.ja v a2s  . c  om
                } else if (red >= 128) {
                    redArea = 2;
                } else if (red >= 64) {
                    redArea = 1;
                } else if (red >= 0) {
                    redArea = 0;
                }

                if (green >= 192) {
                    greenArea = 3;
                } else if (green >= 128) {
                    greenArea = 2;
                } else if (green >= 64) {
                    greenArea = 1;
                } else if (green >= 0) {
                    greenArea = 0;
                }

                if (blue >= 192) {
                    blueArea = 3;
                } else if (blue >= 128) {
                    blueArea = 2;
                } else if (blue >= 64) {
                    blueArea = 1;
                } else if (blue >= 0) {
                    blueArea = 0;
                }
                int index = redArea * 16 + greenArea * 4 + blueArea;

                areaColor[index] += 1;
            }
        }
        return areaColor;
    }

}

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