Paint除了通过setColor()/setARGB()/setAlpha()等方法设置paint的颜色外,还可以通过设置滤镜ColorFilter来改变绘制出来的颜色。ColorFilter对应以下三个子类。
颜色矩阵颜色过滤器:ColorMatrixColorFilter
光照色彩过滤器:LightingColorFilter
混排颜色过滤器滤器PorterDuffColorFilter
1 LightingColorFilter
先来看看这个ColorFilter的构造器,它接受两个参数,一个是mul,一个是add
LightingColorFilter(int mul, int add)复制代码
比如你现在设置paint的color是#1b8fe6,然后通过滤镜后想要让其颜色不变,那么可以设置mul为0xffffff,add为0x000000。 前两个ff表示红色的十六进制 中间两个ff表示绿色的十六进制 后边两个ff表示蓝色的十六进制 转换成十进制就是0-255的范围值 值越大 表示对应的颜色就越深 add为0x000000 这是颜色加深的效果 比如 想要 绿色增强 就可以把 中间两个00改成000100, 000800, 008800 直到255 最大值也是255 对应十六进制的最大值为0x00ff00 其实这个玩意是这样去计算的,我们记paint设置的颜色中三基色的值为R,G,B,mul中的三基色的值为mul.R,mul.G,mul.B,add中的三基色的值为add.R,add.G,add.B,那么最终的三基色为jis
经过滤镜后的R = R * mul.R / 0xff + add.R
经过滤镜后的G = G * mul.G / 0xff + add.G
经过滤镜后的B = B * mul.B / 0xff + add.B复制代码
RGBA模型:
RGBA不知道你听过没,黄绿蓝知道了吧,光的三基色,而RAGB则是在此的基础上多了一个透明度! R(Red红色),G(Green绿色),B(Blue蓝色),A(Alpha透明度);另外要和颜料的三 原色区分开来哦,最明显的区别就是颜料的三原色中用黄色替换了光三基色中的绿色!
接下来 我们使用
PorterDuff.Mode 图层混合 和 LightingColorFilter 实现一个滤镜效果,先上效果图
正常图片
使用滤镜后的图片
public class PictureView extends View
{
private LightingColorFilter lightingColorFilter;
private Paint mPaint;
private int mWidth, mHeight;
Bitmap mBitmap;
public PictureView(Context context)
{
this(context, null);
}
public PictureView(Context context, AttributeSet attrs)
{
this(context, attrs, 0);
}
public PictureView(Context context, AttributeSet attrs, int defStyleAttr)
{
super(context, attrs, defStyleAttr);
init();
}
private void init()
{
//初始化画笔
mPaint = new Paint();
mPaint.setColor(Color.RED);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.buteys).copy(Bitmap.Config.ARGB_8888, true);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh)
{
super.onSizeChanged(w, h, oldw, oldh);
mWidth = w;
mHeight = h;
}
@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
setBackgroundColor(Color.WHITE);
//离屏绘制 这里将图像合成的处理放到离屏缓存中进行
int layerId = canvas.saveLayer(0, 0, getWidth(), getHeight(), mPaint, Canvas.ALL_SAVE_FLAG);
//目标图
canvas.drawBitmap(mBitmap, mWidth / 2 - mBitmap.getWidth() / 2-120, mHeight / 3 - mBitmap.getHeight() / 4, mPaint);
mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
canvas.drawBitmap(createCircleBitmap(mWidth, mHeight), 0, 0, mPaint);
//清除混合模式
mPaint.setXfermode(null);
canvas.restoreToCount(layerId);
}
//画圆src
public Bitmap createCircleBitmap(int width, int height)
{
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
Paint scrPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
scrPaint.setColor(0xFFFFCC44);
canvas.drawCircle(width / 2, height / 2, 500, scrPaint);
return bitmap;
}
/**
* 获取RGB值
*
* @param r
* @param g
* @param b
*/
public void changeRGB(int r, int g, int b) {
int mr = 0;
int mg = 0;
int mb = 0;
int ar = 0;
int ag = 0;
int ab = 0;
if (r < 0) {
mr = r + 255;
ar = 0;
} else if (r == 0) {
mr = 255;
ar = 0;
} else {
mr = 255;
ar = r;
}
if (g < 0) {
mg = g + 255;
ag = 0;
} else if (g == 0) {
mg = 255;
ag = 0;
} else {
mg = 255;
ag = g;
}
if (b < 0) {
mb = b + 255;
ab = 0;
} else if (b == 0) {
mb = 255;
ab = 0;
} else {
mb = 255;
ab = b;
}
lightingColorFilter = new LightingColorFilter(0xffffff,0x000000);
lightingColorFilter = new LightingColorFilter(
Integer.valueOf(transString(Integer.toHexString(mr)) + transString(Integer.toHexString(mg)) + transString(Integer.toHexString(mb)), 16),
Integer.valueOf(transString(Integer.toHexString(ar)) + transString(Integer.toHexString(ag)) + transString(Integer.toHexString(ab)), 16));
mPaint.setColorFilter(lightingColorFilter);
invalidate();
}
/**
* 处理RGB
*
* @param s
* @return
*/
public String transString(String s) {
if (s.length() == 1) {
return "0" + s;
} else {
return s;
}
}
}复制代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<com.rx.myapplication.PictureView
android:id="@+id/pv"
android:layout_width="match_parent"
android:layout_height="350dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center_vertical"
android:orientation="horizontal"
android:paddingRight="10dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:text="R"
android:textSize="18sp" />
<SeekBar
android:id="@+id/sb_r"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="8" />
<TextView
android:id="@+id/tv_r"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center_vertical"
android:orientation="horizontal"
android:paddingRight="10dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:text="G"
android:textSize="18sp" />
<SeekBar
android:id="@+id/sb_g"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="8" />
<TextView
android:id="@+id/tv_g"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center_vertical"
android:orientation="horizontal"
android:paddingRight="10dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:text="B"
android:textSize="18sp" />
<SeekBar
android:id="@+id/sb_b"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="8" />
<TextView
android:id="@+id/tv_b"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center" />
</LinearLayout>
</LinearLayout>
</LinearLayout>复制代码
public class MainActivity extends AppCompatActivity implements SeekBar.OnSeekBarChangeListener
{
private SeekBar sb_r;
private SeekBar sb_g;
private SeekBar sb_b;
private TextView tv_r;
private TextView tv_g;
private TextView tv_b;
private PictureView pv;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
sb_r.setOnSeekBarChangeListener(this);
sb_g.setOnSeekBarChangeListener(this);
sb_b.setOnSeekBarChangeListener(this);
}
private void initView()
{
pv = (PictureView) findViewById(R.id.pv);
sb_r = (SeekBar) findViewById(R.id.sb_r);
sb_g = (SeekBar) findViewById(R.id.sb_g);
sb_b = (SeekBar) findViewById(R.id.sb_b);
tv_r = (TextView) findViewById(R.id.tv_r);
tv_g = (TextView) findViewById(R.id.tv_g);
tv_b = (TextView) findViewById(R.id.tv_b);
sb_r.setMax(510);
sb_g.setMax(510);
sb_b.setMax(510);
sb_r.setProgress(255);
sb_g.setProgress(255);
sb_b.setProgress(255);
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)
{
pv.changeRGB(sb_r.getProgress() - 255, sb_g.getProgress() - 255, sb_b.getProgress() - 255);
switch (seekBar.getId())
{
case R.id.sb_r:
tv_r.setText(progress - 255 + "");
break;
case R.id.sb_g:
tv_g.setText(progress - 255 + "");
break;
case R.id.sb_b:
tv_b.setText(progress - 255 + "");
break;
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar)
{
}
@Override
public void onStopTrackingTouch(SeekBar seekBar)
{
}
}复制代码
2 PortDuffColorFilter
PorterDuffColorFilter porterDuffColorFilter=new PorterDuffColorFilter(Color.RED,PorterDuff.Mode.DARKEN);
mPaint.setColorFilter(porterDuffColorFilter);
invalidate();
复制代码
最后的效果 红色加深
3 ColorMatrixColorFilter
1、ColorMatrix处理图片原理
ColorMatrix正如我们所翻译的“颜色矩阵”,它是通过矩阵的方式作用与图像的像素来实现的图片的处理。
(1)ColorMAtrix颜色矩阵 颜色矩阵M是一个5*4的矩阵,如图所示。但是在Android中,颜色矩阵M是以一维数组M=[a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t]的方式进行存储的。
(2)颜色的分量矩阵 颜色的分量矩阵分别有R、G、B、A、1组成,用于调整三原色和透明度 (3)变换过程
第一行将会影响红色,第二行影响绿色,第三行影响蓝色,最后一行操作的是Alpha值。
1,0,0,0,0
0,1,0,0,0
0,0,1,0,0
0,0,0,1,0
当使用默认矩阵时 ,图像保持不变,
float[] colorMatrix = {
1,0,0,0,0, //red
0,1,0,0,0, //green
0,0,1,0,0, //blue
0,0,0,1,0 //alpha
};
ColorMatrixColorFilter colorMatrixColorFilter = new ColorMatrixColorFilter(colorMatrix);
mPaint.setColorFilter(colorMatrixColorFilter);
复制代码
现在我们修改 RGBA值的系数 矩阵的红色变成 2,可以看到红色加深了
float[] colorMatrix = {
2,0,0,0,0, //red
0,1,0,0,0, //green
0,0,1,0,0, //blue
0,0,0,1,0 //alpha
};
ColorMatrixColorFilter colorMatrixColorFilter = new ColorMatrixColorFilter(colorMatrix);
mPaint.setColorFilter(colorMatrixColorFilter)复制代码
我们修改 RGBA值的系数 矩阵的绿色变成2,可以看到绿色加深了
float[] colorMatrix = {
1,0,0,0,0, //red
0,2,0,0,0, //green
0,0,1,0,0, //blue
0,0,0,1,0 //alpha
};
ColorMatrixColorFilter colorMatrixColorFilter = new ColorMatrixColorFilter(colorMatrix);
mPaint.setColorFilter(colorMatrixColorFilter);复制代码
我们也可以修改矩阵的偏移量 来过滤图片,我们让红色和绿色的偏移量都变成60,照片变成黄色系
float[] colorMatrix = {
1,0,0,0,60, //red
0,1,0,0,60, //green
0,0,1,0,0, //blue
0,0,0,1,0 //alpha
};ColorMatrixColorFilter colorMatrixColorFilter = new ColorMatrixColorFilter(colorMatrix);
mPaint.setColorFilter(colorMatrixColorFilter);
复制代码
// 胶片效果复制代码
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};
mColorMatrixColorFilter = new ColorMatrixColorFilter(colormatrix_fanse);
mPaint.setColorFilter(mColorMatrixColorFilter);
canvas.drawBitmap(mBitmap, 100, 0, mPaint);
复制代码
常用效果
// 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2
public 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};复制代码
ColorMatrix 类的使用
正常图片
ColorMatrix cm = new ColorMatrix();
//亮度调节
cm.setScale(1,2,1,1);
绿色高亮复制代码
//饱和度调节0-无色彩 就是黑白图片, 1- 默认效果, >1饱和度加强
//cm.setScale(1,2,1,1);
cm.setSaturation(2);复制代码
cm.setSaturation(2);
//色调调节
cm.setRotate(0, 45);复制代码
转载于:https://juejin.im/post/5cf71d786fb9a07ef63fcac6