Question

嗨，我创建了一个图片框，当选择了一个效果时，它会使用颜色矩阵更改图片框中的图像。

我遇到的问题是，如果我选择一个效果时选择另一个效果，旧效果将不会消失，而是只会停留在选定的新效果下面。我现在使用的效果是棕褐色和灰度，但是任何人都可以帮助我，这样一旦选择了一个效果，旧效果就会被清除，而不是仅仅相互叠加。

我正在使用图形和colormatrix以及位图，这是我的两个按钮的代码：

Graphics g;

private void greyscalePicture_Click(object sender, EventArgs e)
{

   Image img = pictureBox.Image;
   Bitmap greyscaleBitmap = new Bitmap(img.Width, img.Height);
   ImageAttributes ia = new ImageAttributes();
   ColorMatrix cmImage = new ColorMatrix(new float[][]
   {
      new float[] {.3f, .3f, .3f, 0, 0}, 
      new float[] {.59f, .59f, .59f, 0, 0}, 
      new float[] {.11f, .11f, .11f, 0, 0}, 
      new float[] {0, 0, 0, 1, 0}, 
      new float[] {0, 0, 0, 0, 1}
   });
   ia.SetColorMatrix(cmImage);
   g = Graphics.FromImage(greyscaleBitmap);
   g.DrawImage(img, new Rectangle(0, 0, img.Width, img.Height), 0, 0,
               img.Width, img.Height, GraphicsUnit.Pixel, ia);
   g.Dispose();
   pictureBox.Image = greyscaleBitmap;
}

// This is the same as the grey effect except
// the float values have been changed
private void sepiaPicture_Click(object sender, EventArgs e)
{
   Image img = pictureBox.Image;
   Bitmap sepiaBitmap = new Bitmap(img.Width, img.Height);
   ImageAttributes ia = new ImageAttributes();
   ColorMatrix cmImage = new ColorMatrix(new float[][]
   {
      new float[] {.393f, .349f, .272f, 0, 0}, 
      new float[] {.769f, .686f, .534f, 0, 0}, 
      new float[] {.189f, .168f, .131f, 0, 0}, 
      new float[] {0, 0, 0, 1, 0}, 
      new float[] {0, 0, 0, 0, 1} 
   });
   ia.SetColorMatrix(cmImage);
   g = Graphics.FromImage(sepiaBitmap);
   g.DrawImage(img, new Rectangle(0, 0, img.Width, img.Height), 0, 0,
               img.Width, img.Height, GraphicsUnit.Pixel, ia);
   g.Dispose();
   pictureBox.Image = sepiaBitmap;
}

Answer 1

您必须存储原始图像，将效果应用于此原始，而不是当前的

//Your form constructor
public Form1(){
   InitializeComponent();
   originalImage = pictureBox.Image;
}
Image originalImage;
private void greyscalePicture_Click(object sender, EventArgs e) {
 Image img = originalImage;// Not pictureBox.Image
 //...
}
private void sepiaPicture_Click(object sender, EventArgs e) {
 Image img = originalImage;// Not pictureBox.Image
 //...
}

重点是，只要您想保存当前状态，只需更新originalImage以使任何下一个效果适用或。

如何使效果工作一个并覆盖其他人

1 个答案: