Android图片模糊效果

在进行模糊的时候，可以先对原始图片进行压缩，然后选择一个合适的方式进行模糊。
效果如下：

模糊

1、处理图片

缩放、旋转图片

    private Bitmap getBitmap(Bitmap source) {
        //scaleFactor：压缩比
        Bitmap tempBitmap= Bitmap.createBitmap((int) (source.getWidth() / scaleFactor), (int) blurHeight, Bitmap.Config.ARGB_8888);
        Canvas canvas=new Canvas(tempBitmap);
        canvas.scale(1/scaleFactor,-1*blurHeight/source.getHeight());
        canvas.translate(0, -source.getHeight());
        Paint paint=new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setFlags(Paint.FILTER_BITMAP_FLAG);
//        ColorMatrix colorMatrix=new ColorMatrix();
//        colorMatrix.setScale(0.8f,0.8f,0.8f,1);
//        paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
        canvas.drawBitmap(source, 0, 0, paint);
        return tempBitmap;
    }

2、模糊图片

1、fastblur
stackblur的java实现，这里

• 使用

Blur.fastblur(context,tempBitmap,25);

2、rs-stackblur
stackblur的Renderscript实现，这里

• 添加依赖

compile 'com.commit451:NativeStackBlur:1.0.2'

• 使用

NativeStackBlur.process(tempBitmap, 60);

其中，模糊半径越大，处理后的图片越模糊

参考：NativeStackBlur 高斯模糊

**3、RenderScript ** ScriptIntrinsicBlur
RenderScript，一个强大的图片处理框架，可以使用ScriptIntrinsicBlur 实现高斯模糊的效果（API 17）。
需要进行如下配置：

defaultConfig {
    ......
    renderscriptTargetApi 19
    renderscriptSupportModeEnabled  true
}

代码如下：

public Bitmap blurBitmap(Bitmap bitmap){
        
    //Let's create an empty bitmap with the same size of the bitmap we want to blur
    Bitmap outBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
        
    //Instantiate a new Renderscript
    RenderScript rs = RenderScript.create(getApplicationContext());
        
    //Create an Intrinsic Blur Script using the Renderscript
    ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
        
    //Create the Allocations (in/out) with the Renderscript and the in/out bitmaps
    Allocation allIn = Allocation.createFromBitmap(rs, bitmap);
    Allocation allOut = Allocation.createFromBitmap(rs, outBitmap);
        
    //Set the radius of the blur: 0 < radius <= 25
    blurScript.setRadius(25.0f);
        
    //Perform the Renderscript
    blurScript.setInput(allIn);
    blurScript.forEach(allOut);
        
    //Copy the final bitmap created by the out Allocation to the outBitmap
    allOut.copyTo(outBitmap);
        
    //recycle the original bitmap
    bitmap.recycle();
        
    //After finishing everything, we destroy the Renderscript.
    rs.destroy();
        
    return outBitmap;   
        
}

引用自：Android RenderScript 简单高效实现图片的高斯模糊效果

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