C# 图片叠加

Question

不明白你怎么合... Red + green = yellow?这样

Answer 1

比如说 图A中有一红色的矩形，叠加到图B上时为一为红色且通明的矩形（能够看到原图A的东西，但就是蒙上了一层通明的红色）

Answer 2

我写了个demo，可以实现了。private void button1_Click(object sender, EventArgs e)
        {
            Color c = new Color();
            Bitmap box1 = new Bitmap(pictureBox1.Image);
            Bitmap box2 = new Bitmap(pictureBox2.Image);
            Bitmap box3 = new Bitmap(pictureBox2.Image);
            for (int i = 0; i < pictureBox1.Image.Width; i++)
            {
                for (int j = 0; j < pictureBox1.Image.Height; j++)
                {
                    c = box2.GetPixel(i, j);  //去Picture2的颜色。                    if (c == Color.FromArgb(255,255,255))
                    {
                        c = box1.GetPixel(i, j); //如果是白色就取Picture1的颜色                    }
                    if (c == Color.FromArgb(255, 0, 0))
                    {
                        c = Color.FromArgb(20, c); //如果是红色就做半透明处理Alpha = 20；
                    }                    box3.SetPixel(i, j, c);
                }
                pictureBox1.Refresh();
                pictureBox1.Image = box3;
            }        }
注意两个PictureBox的属性设置,否则会造成益处: this.pictureBox1.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("pictureBox1.BackgroundImage")));
            this.pictureBox1.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Stretch;
            this.pictureBox1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
            this.pictureBox1.Image = ((System.Drawing.Image)(resources.GetObject("pictureBox1.Image")));
            this.pictureBox1.Location = new System.Drawing.Point(41, 60);
            this.pictureBox1.Name = "pictureBox1";
            this.pictureBox1.Size = new System.Drawing.Size(243, 224);
            this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
            this.pictureBox1.TabIndex = 0;
            this.pictureBox1.TabStop = false;
            // 
            // pictureBox2
            // 
            this.pictureBox2.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
            this.pictureBox2.Image = ((System.Drawing.Image)(resources.GetObject("pictureBox2.Image")));
            this.pictureBox2.Location = new System.Drawing.Point(338, 60);
            this.pictureBox2.Name = "pictureBox2";
            this.pictureBox2.Size = new System.Drawing.Size(243, 224);
            this.pictureBox2.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
            this.pictureBox2.TabIndex = 1;
            this.pictureBox2.TabStop = false;

Answer 3

使用 System.Drawing.Drawing2D.Matrix 改变Alpha值。
Matrix是一个矩阵，从0-1成倍的变换。

Answer 4

把IMAGE2转换成灰度图 fb(,),其中的黑白色不变，红色成了灰色。
将fB(,) 的值调整为 0~1 之前的浮点数。
将fB(,)做为 Image2 叠加的透明通道，即 fLast (,) = Image1(,) + Image2(,) * fB(,);
 

Answer 5

明白了点
你先知道 你红色的区域..并获取到Rectangle
使用
Grapchis.FillRectangle(new SolidBrush(Color.FromArgb(0,255,255,255)) 
绘制成全透明的图
Grapchis.FillRectangle(new SolidBrush(Color.FromArgb(100, 255, 255, 255))
然后绘制成半透明的图.然后把这个图形绘制到你要绘制的地方就可以了.. 你试下没试过:)

Answer 6

错误 1 当前上下文中不存在名称“resources” C:\Documents and Settings\Administrator\桌面\565465\WindowsApplication1\WindowsApplication1\Form1.cs 49 72 WindowsApplication1
请问下面的resources是什么对象啊？？？？
this.pictureBox1.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("pictureBox1.BackgroundImage")));