Paint MaskFilter类进行处理、颜色RGB的滤镜处理

颜色值时32位的int值，ARGB ：A---Alpha值，RGB---颜色值

1、Alpha滤镜处理
MaskFilter类进行处理

BlurMaskFilter--用来绘制模糊阴影
EmbossMaskFilter -- 用来实现浮雕效果

2、颜色RGB的滤镜处理


1、色彩的平移运算---加法运算
在最后一列加上某个值，这样就可以增加特定色彩的饱和度


色彩的反转/反相；增加饱和度


2、色彩的缩放运算--乘法运算


高亮图片
颜色通道过滤（单独红色、绿色、蓝色）


3、色彩的投射运算

黑白照片
色彩反色（两个颜色交换）
复古照片
4、色彩的旋转运算


3、两者混合叠加---Matrix，PortDuffColorFilter

import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.BlurMaskFilter;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.ColorMatrix;import android.graphics.ColorMatrixColorFilter;import android.graphics.EmbossMaskFilter;import android.graphics.LightingColorFilter;import android.graphics.MaskFilter;import android.graphics.Paint;import android.graphics.PorterDuff;import android.graphics.PorterDuffColorFilter;import android.graphics.Rect;import android.graphics.RectF;import android.support.annotation.Nullable;import android.util.AttributeSet;import android.view.View;/** * Created by linyaokui on 17/5/17. */public class FilterView extends View{    private Paint paint;    private Bitmap bitmap;    public FilterView(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        paint  = new Paint(Paint.ANTI_ALIAS_FLAG);        bitmap = BitmapFactory.decodeResource(getResources(),R.mipmap.xyjy2);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        setLayerType(LAYER_TYPE_SOFTWARE,null);//去掉硬件加速        //BlurMaskFilter用法 阴影效果        /**         * Create a blur maskfilter.         *         * @param radius 阴影的半径         * @param style  NORMOL -- 整个图像都被模糊掉         *               SOLID -- 图像边界外产生一层与Paint颜色一致阴影效果，不影响图像的本身         *               OUTER -- 图像边界外产生一层阴影，并且将图像变成透明效果         *               INNER -- 在图像内部边沿产生模糊效果         * @return         */        MaskFilter maskFilter = new BlurMaskFilter(50, BlurMaskFilter.Blur.NORMAL);        paint.setMaskFilter(maskFilter);        canvas.drawBitmap(bitmap,100,100,paint);        //EmbossMaskFilter 浮雕效果        /**         * Create an emboss maskfilter         *         * @param direction  指定光源的位置，长度为xxx的数组标量[x,y,z]         * @param ambient    环境光的因子 （0~1），越接近0，环境光越暗         * @param specular   镜面反射系数 越接近0，镜面反射越强         * @param blurRadius 模糊半径 值越大，模糊效果越明显         */        Rect rect = new Rect(100,100,600,600);        paint.setColor(Color.RED);        MaskFilter embossMaskFilter = new EmbossMaskFilter(new float[]{1,1,1},0.1f,0.1f,50);        paint.setMaskFilter(embossMaskFilter);        canvas.drawRect(rect,paint);        //颜色RGB的滤镜处理 ColorMatrixColorFilter用法        // 平移运算---加法        ColorMatrix colorMatrix = new ColorMatrix(new float[]{            1,0,0,0,0,            0,1,0,0,100,            0,0,1,0,0,            0,0,0,1,0,        });        //  反相效果 -- 底片效果        ColorMatrix colorMatrix = new ColorMatrix(new float[]{                -1,0,0,0,255,                0,-1,0,0,255,                0,0,-1,0,255,                0,0,0,1,0        });        //  反相效果 -- 底片效果        ColorMatrix colorMatrix = new ColorMatrix(new float[]{                1.2f,0,0,0,0,                0,1.2f,0,0,0,                0,0,1.2f,0,0,                0,0,0,1.2f,0        });        // 黑白照片        // 去色原理：只要把R G B 三通道的色彩信息设置成一样，那么图像就会变成灰色，        // 同时为了保证图像亮度不变，同一个通道里的R+G+B =1        //        ColorMatrix colorMatrix = new ColorMatrix(new float[]{                0.213f, 0.715f,0.072f,0,0,                0.213f, 0.715f,0.072f,0,0,                0.213f, 0.715f,0.072f,0,0,                0,0,0,1,0,        });        // 发色效果---（比如红色和绿色交换）        ColorMatrix colorMatrix = new ColorMatrix(new float[]{                0,1,0,0,0,                1, 0,0,0,0,                0,0,1,0,0,                0,0,0,1,0,        });        // 复古效果        ColorMatrix colorMatrix = new ColorMatrix(new float[]{                1/2f,1/2f,1/2f,0,0,                1/3f, 1/3f,1/3f,0,0,                1/4f,1/4f,1/4f,0,0,                0,0,0,1,0,        });        // 颜色通道过滤        ColorMatrix colorMatrix = new ColorMatrix(new float[]{                1, 0,0,0,0,                0,0,0,0,0,                0,0,0,0,0,                0,0,0,1,0,        });        //另一种写法        ColorMatrix colorMatrix = new ColorMatrix();        ColorMatrix colorMatrix1 = new ColorMatrix();        colorMatrix.setScale(1.2f,1.2f,1.2f,1);        colorMatrix.setSaturation(0.5f); //设置饱和度 sat A value of 0 maps the color to gray-scale. 1 is identity        //aixs-- 0 红色轴，1，绿色，2，蓝色        // degrees -- 旋转的角度        colorMatrix1.setRotate(0,60);        colorMatrix.setConcat(colorMatrix,colorMatrix1);//两个ColorMatrix合并        paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));        canvas.drawBitmap(bitmap,100,100,paint);       // LightingColorFilter只是修改RGB值        LightingColorFilter lightingColorFilter = new LightingColorFilter(0x00ff00,0xff0000);        paint.setColorFilter(lightingColorFilter);        canvas.drawBitmap(bitmap,100,100,paint);        //PorterDuffColorFilter        PorterDuffColorFilter porterDuffColorFilter = new PorterDuffColorFilter(Color.argb(255,140,90,200), PorterDuff.Mode.MULTIPLY);        paint.setColorFilter(porterDuffColorFilter);        canvas.drawBitmap(bitmap,100,100,paint);    }}