grey Scale Bitmap - Android android.graphics

Android examples for android.graphics:Bitmap Operation

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  4. Bitmap Operation

Description

grey Scale Bitmap

Demo Code


//package com.java2s;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;

public class Main {
    public static Bitmap greyScale(Bitmap source) {
        int width = source.getWidth();
        int height = source.getHeight();

        Bitmap bitmap = Bitmap.createBitmap(width, height,
                Bitmap.Config.ARGB_8888);

        Canvas canvas = new Canvas(bitmap);
        ColorMatrix saturation = new ColorMatrix();
        saturation.setSaturation(0f);/* ww  w .ja v  a 2  s.c  o m*/
        Paint paint = new Paint();
        paint.setColorFilter(new ColorMatrixColorFilter(saturation));
        canvas.drawBitmap(source, 0, 0, paint);
        source.recycle();

        if (source != bitmap) {
            source.recycle();
        }

        return bitmap;
    }
}

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