文章目录
一、LightingColorFilter滤镜（颜色+颜色创建的滤镜效果）二、PorterDuffColorFilter滤镜（颜色+图片）三、ColorMatrixColorFilter滤镜（颜色数组、颜色矩阵）四、常见滤镜效果五、ColorMatrix类5.1 setScale方法5.2 setSaturation方法5.3 setRotate方法一、LightingColorFilter滤镜（颜色+颜色创建的滤镜效果）
构造：
public LightingColorFilter(int mul, int add)
参数：
mul和add都是和颜色值格式相同的int值，mul是和目标像素相乘，add是和目标像素相加：
其中，若传入0x00ffff，对R而言，colorMultiply.R表示的就是：00；colorAdd.R表示：00
R’ = R * colorMultiply.R + colorAdd.RG’ = G * colorMultiply.G + colorAdd.GB’ = B * colorMultiply.B + colorAdd.B
使用：
LightingColorFilter lightingColorFilter = new LightingColorFilter(0x00ffff, 0x000000);mPaint.setColorFilter(lightingColorFilter);canvas.drawBitmap(mBitmap,0,0,mPaint);
效果：
如果想保留图片的原始效果，只需将mul改成0xffffff即可：
//保留原始效果LightingColorFilter lightingColorFilter = new LightingColorFilter(0xffffff, 0x000000);mPaint.setColorFilter(lightingColorFilter);canvas.drawBitmap(mBitmap,0,0,mPaint);
效果：
想要绿色更亮：
//增大add的值，让绿色更亮LightingColorFilter lightingColorFilter = new LightingColorFilter(0xffffff, 0x003000);mPaint.setColorFilter(lightingColorFilter);canvas.drawBitmap(mBitmap,0,0,mPaint);
二、PorterDuffColorFilter滤镜（颜色+图片）
构造方法：
public PorterDuffColorFilter(@ColorInt int color, @NonNull PorterDuff.Mode mode)
参数：
color：具体的颜色值，例如Color.RED
mode:指定PorterDuff.mode混合模式
使用：
//PorterDuffColorFilterPorterDuffColorFilter porterDuffColorFilter = new PorterDuffColorFilter(Color.RED, PorterDuff.Mode.DARKEN);mPaint.setColorFilter(porterDuffColorFilter);canvas.drawBitmap(mBitmap,100,0,mPaint);
运行效果：
不仅变红，而且变暗了。传入的是Color.RED,创建新的图层，图层颜色为红色。而原图片就可以看做为第二个图层。两个图层叠合在一起，就有了这个效果。PorterDuff.Mode.DARKEN模式表示在之前红色图片上，进一步将其调为暗色。这里是颜色和图片产生的滤镜效果
三、ColorMatrixColorFilter滤镜（颜色数组、颜色矩阵）
构造方法：
//传入数组，长度20。 第5列表示颜色的偏移量public ColorMatrixColorFilter(float[] array)
参数：
array：矩阵数组
使用：
//ColorMatrixColorFilterfloat[] colorMatrix={1,0,0,0,0, //red0,1,0,0,0, //green0,0,1,0,0, //blue0,0,0,1,0 //alpha 新颜色值的透明度};ColorMatrixColorFilter colorMatrixColorFilter = new ColorMatrixColorFilter(colorMatrix);mPaint.setColorFilter(colorMatrixColorFilter);canvas.drawBitmap(mBitmap,100,0,mPaint);
运行效果：
原图像效果。究其原因，我们要了解一下颜色矩阵-色彩矩阵分析。
下面我们将颜色矩阵的值做修改再运行，红色和绿色的偏移量，得到黄色的效果。：
float[] colorMatrix={1,0,0,0,100, //red0,1,0,0,100, //green0,0,1,0,0, //blue0,0,0,1,0 //alpha 新颜色值的透明度};
通过修改RGB中系数a的值，红色更亮：
float[] colorMatrix={2,0,0,0,0, //red0,1,0,0,0, //green0,0,1,0,0, //blue0,0,0,1,0 //alpha 新颜色值的透明度};
修改一张图片的彩色效果，有2种方式：
①修改偏移量②RGBA的系数值
四、常见滤镜效果
// 黑白public static final float colormatrix_heibai[] = {0.8f, 1.6f, 0.2f, 0, -163.9f,0.8f, 1.6f, 0.2f, 0, -163.9f,0.8f, 1.6f, 0.2f, 0, -163.9f,0, 0, 0, 1.0f, 0};// 怀旧public static final float colormatrix_huajiu[] = {0.2f, 0.5f, 0.1f, 0, 40.8f,0.2f, 0.5f, 0.1f, 0, 40.8f,0.2f, 0.5f, 0.1f, 0, 40.8f,0, 0, 0, 1, 0};// 哥特public static final float colormatrix_gete[] = {1.9f, -0.3f, -0.2f, 0, -87.0f,-0.2f, 1.7f, -0.1f, 0, -87.0f,-0.1f, -0.6f, 2.0f, 0, -87.0f,0, 0, 0, 1.0f, 0};// 淡雅public static final float colormatrix_danya[] = {0.6f, 0.3f, 0.1f, 0, 73.3f,0.2f, 0.7f, 0.1f, 0, 73.3f,0.2f, 0.3f, 0.4f, 0, 73.3f,0, 0, 0, 1.0f, 0};// 蓝调public static final float colormatrix_landiao[] = {2.1f, -1.4f, 0.6f, 0.0f, -71.0f,-0.3f, 2.0f, -0.3f, 0.0f, -71.0f,-1.1f, -0.2f, 2.6f, 0.0f, -71.0f,0.0f, 0.0f, 0.0f, 1.0f, 0.0f};// 光晕public static final float colormatrix_guangyun[] = {0.9f, 0, 0, 0, 64.9f,0, 0.9f, 0, 0, 64.9f,0, 0, 0.9f, 0, 64.9f,0, 0, 0, 1.0f, 0};// 梦幻public static final float colormatrix_menghuan[] = {0.8f, 0.3f, 0.1f, 0.0f, 46.5f,0.1f, 0.9f, 0.0f, 0.0f, 46.5f,0.1f, 0.3f, 0.7f, 0.0f, 46.5f,0.0f, 0.0f, 0.0f, 1.0f, 0.0f};// 酒红public static final float colormatrix_jiuhong[] = {1.2f, 0.0f, 0.0f, 0.0f, 0.0f,0.0f, 0.9f, 0.0f, 0.0f, 0.0f,0.0f, 0.0f, 0.8f, 0.0f, 0.0f,0, 0, 0, 1.0f, 0};// 胶片public static final float colormatrix_fanse[] = {-1.0f, 0.0f, 0.0f, 0.0f, 255.0f,0.0f, -1.0f, 0.0f, 0.0f, 255.0f,0.0f, 0.0f, -1.0f, 0.0f, 255.0f,0.0f, 0.0f, 0.0f, 1.0f, 0.0f};// 湖光掠影public static final float colormatrix_huguang[] = {0.8f, 0.0f, 0.0f, 0.0f, 0.0f,0.0f, 1.0f, 0.0f, 0.0f, 0.0f,0.0f, 0.0f, 0.9f, 0.0f, 0.0f,0, 0, 0, 1.0f, 0};// 褐片public static final float colormatrix_hepian[] = {1.0f, 0.0f, 0.0f, 0.0f, 0.0f,0.0f, 0.8f, 0.0f, 0.0f, 0.0f,0.0f, 0.0f, 0.8f, 0.0f, 0.0f,0, 0, 0, 1.0f, 0};// 复古public static final float colormatrix_fugu[] = {0.9f, 0.0f, 0.0f, 0.0f, 0.0f,0.0f, 0.8f, 0.0f, 0.0f, 0.0f,0.0f, 0.0f, 0.5f, 0.0f, 0.0f,0, 0, 0, 1.0f, 0};// 泛黄public static final float colormatrix_huan_huang[] = {1.0f, 0.0f, 0.0f, 0.0f, 0.0f,0.0f, 1.0f, 0.0f, 0.0f, 0.0f,0.0f, 0.0f, 0.5f, 0.0f, 0.0f,0, 0, 0, 1.0f, 0};// 传统public static final float colormatrix_chuan_tong[] = {1.0f, 0.0f, 0.0f, 0, -10f,0.0f, 1.0f, 0.0f, 0, -10f,0.0f, 0.0f, 1.0f, 0, -10f,0, 0, 0, 1, 0};// 胶片2public static final float colormatrix_jiao_pian[] = {0.71f, 0.2f, 0.0f, 0.0f, 60.0f,0.0f, 0.94f, 0.0f, 0.0f, 60.0f,0.0f, 0.0f, 0.62f, 0.0f, 60.0f,0, 0, 0, 1.0f, 0};// 锐色public static final float colormatrix_ruise[] = {4.8f, -1.0f, -0.1f, 0, -388.4f,-0.5f, 4.4f, -0.1f, 0, -388.4f,-0.5f, -1.0f, 5.2f, 0, -388.4f,0, 0, 0, 1.0f, 0};// 清宁public static final float colormatrix_qingning[] = {0.9f, 0, 0, 0, 0,0, 1.1f, 0, 0, 0,0, 0, 0.9f, 0, 0,0, 0, 0, 1.0f, 0};// 浪漫public static final float colormatrix_langman[] = {0.9f, 0, 0, 0, 63.0f,0, 0.9f, 0, 0, 63.0f,0, 0, 0.9f, 0, 63.0f,0, 0, 0, 1.0f, 0};// 夜色public static final float colormatrix_yese[] = {1.0f, 0.0f, 0.0f, 0.0f, -66.6f,0.0f, 1.1f, 0.0f, 0.0f, -66.6f,0.0f, 0.0f, 1.0f, 0.0f, -66.6f,0.0f, 0.0f, 0.0f, 1.0f, 0.0f};
以其中的胶片效果为例，它就是将颜色数组中RGB中的系数取反，将颜色值反转，再加偏移量。
五、ColorMatrix类
5.1 setScale方法
ColorMatrix colorMatrix = new ColorMatrix();//亮度调节colorMatrix.setScale(1,1,1,1);//红、绿、蓝、透明度4个分量通道对应的系数ColorMatrixColorFilter colorMatrixColorFilter = new ColorMatrixColorFilter(colorMatrix);mPaint.setColorFilter(colorMatrixColorFilter);canvas.drawBitmap(mBitmap,100,0,mPaint);
setScala方法全传1和原图一样，传1,2,1,1是偏绿色。他可以供我们调整图片的亮度。点进去看源码：
//setScala方法就是操作初始的颜色矩阵，将r/g/b/a四个系数重新赋值。public void setScale(float rScale, float gScale, float bScale,float aScale) {final float[] a = mArray;for (int i = 19; i > 0; --i) {a[i] = 0;}a[0] = rScale;a[6] = gScale;a[12] = bScale;a[18] = aScale;}
5.2 setSaturation方法
setScala方法就是操作初始的颜色矩阵，将r/g/b/a四个系数重新赋值。
ColorMatrix colorMatrix = new ColorMatrix();//饱和度调节:0:无色彩 1：默认图像 >1：饱和度加强colorMatrix.setSaturation(0);ColorMatrixColorFilter colorMatrixColorFilter = new ColorMatrixColorFilter(colorMatrix);mPaint.setColorFilter(colorMatrixColorFilter);canvas.drawBitmap(mBitmap,100,0,mPaint);
5.3 setRotate方法
setRotate方法负责色度调节，也就是对色彩的旋转运算。，参数为：颜色通道axis、角度degrees。源码注释：
/*** Set the rotation on a color axis by the specified values.* <p>* <code>axis=0</code> correspond to a rotation around the RED color* <code>axis=1</code> correspond to a rotation around the GREEN color* <code>axis=2</code> correspond to a rotation around the BLUE color* </p>*/public void setRotate(int axis, float degrees) {reset();double radians = degrees * Math.PI / 180d;float cosine = (float) Math.cos(radians);float sine = (float) Math.sin(radians);switch (axis) {// Rotation around the red colorcase 0:mArray[6] = mArray[12] = cosine;mArray[7] = sine;mArray[11] = -sine;break;// Rotation around the green colorcase 1:mArray[0] = mArray[12] = cosine;mArray[2] = -sine;mArray[10] = sine;break;// Rotation around the blue colorcase 2:mArray[0] = mArray[6] = cosine;mArray[1] = sine;mArray[5] = -sine;break;default:throw new RuntimeException();}}
传入的axis分别为为0、1、2表示红、绿、蓝三个颜色的通道，内部实际上还是操作的矩阵数组。只是算法的不同。首先要对角度值进行sin、cos值的运算，然后进行赋值操作。第二个参数就是要修改的值。具体如下：
ColorMatrix hueMatrix = new ColorMatrix();hueMatrix.setRotate(0,hue0);hueMatrix.setRotate(1,hue1);hueMatrix.setRotate(2,hue2);
至于RGB色如何旋转，首先要根据R、G、B三色来建立三维坐标系，如下：
这里我们假设先暂不考虑蓝色，将绿、红看成二位坐标系，hueMatrix.setRotate(0,hue0);就是对红色的坐标进行旋转，旋转的角度为hue0的值。旋转计算前后的变化：
旋转后的红色的值需要计算R的cos值+G的sin值，绿色也会对其产生影响，故要加上。也就是两个垂直方向的值相加；旋转后绿色的值=G的cos值-R的sin值，也就是水平方向的值相加；当然了，蓝色的计算也是同样的道理
下面我们来试一下修改红色的旋转值：
ColorMatrix colorMatrix = new ColorMatrix();colorMatrix.setRotate(0,45);ColorMatrixColorFilter colorMatrixColorFilter = new ColorMatrixColorFilter(colorMatrix);mPaint.setColorFilter(colorMatrixColorFilter);canvas.drawBitmap(mBitmap,100,0,mPaint);
