Android Image blur beyond renderscript blur radius

BlurEffect.kt

package com.example.ziro.blur

/**
 * Created by ziro on 19/11/17.
 */

import android.content.Context
import android.graphics.Bitmap
import android.graphics.Canvas
import android.renderscript.Allocation
import android.renderscript.Element.U8_4
import android.renderscript.ScriptIntrinsicBlur
import android.renderscript.RenderScript
import android.view.View


public class BlurEffect {
//scales down image, blur it, scale it up  
    fun blur (context : Context, image : Bitmap , scalingFactor : Float = 1f, blurRadius : Float = 1f) : Bitmap {
        var width : Int = Math.round(image.width * scalingFactor)
        var height : Int = Math.round(image.height * scalingFactor)

        var inputBitmap : Bitmap = Bitmap.createScaledBitmap(image , width, height, false)
        var outputBitmap : Bitmap = Bitmap.createBitmap(inputBitmap)

        var rs : RenderScript = RenderScript.create(context)

        var intrinsicBlur : ScriptIntrinsicBlur = ScriptIntrinsicBlur.create(rs, U8_4(rs))
        var tmpIn : Allocation = Allocation.createFromBitmap(rs, inputBitmap)
        var tmpOut : Allocation = Allocation.createFromBitmap(rs, outputBitmap)

        intrinsicBlur.setRadius(blurRadius)
        intrinsicBlur.setInput(tmpIn)
        intrinsicBlur.forEach(tmpOut)
        tmpOut.copyTo(outputBitmap)


        return Bitmap.createBitmap(Bitmap.createScaledBitmap(outputBitmap,image.width, image.height,false))
    }

}