How to change color of Image at runtime

Question

I would like to know is there any way by which we can change the Image color at runtime. for e.g lets say I am having a JPG bind to an Image control of ASP.Net. Next I am ha

Answer 1

I am also facing trouble to under this question. after that based on the some information. I wrote the code manually.Now it works well. If you want to check.you can use it.

code for change the background image during runtime in C#.net

you can use simply this code. That is, ==>

string str; 
OpenFileDialog od = new OpenFileDialog(); 
if (od.ShowDialog() == DialogResult.OK) 
{ 
    str = od.FileName;
    this.BackgroundImage=Image.FromFile(str); 
}

Answer 2

You also try this for web (asp.net) , you can ignore the logic but can see what getpixel & setpixel doing

 public string FileUpload( HttpPostedFileBase file )
  {
     Bitmap bmp = new Bitmap(file.InputStream);
     string valid = "";

     for(int i = 0; i < bmp.Width; i++) {
        for(int j = 0; j < bmp.Height; j++) {
           if(bmp.GetPixel(i , j).B < 20) {
              if(bmp.GetPixel(i , j).B == bmp.GetPixel(i , j).G &&
                 bmp.GetPixel(i , j).B == bmp.GetPixel(i , j).R) {
                 valid = valid + bmp.GetPixel(i , j). + "<br/>";
                 bmp.SetPixel(i , j , Color.DarkGreen);
              }
           }
        }
     }

     SaveImage(bmp);

     return valid;
  }

  private void SaveImage( Bitmap newbmp )
  {
     string path = Path.Combine(Server.MapPath("~/Images") , "ScaledImage.jpeg");
     newbmp.Save(path , System.Drawing.Imaging.ImageFormat.Jpeg);
  }

Answer 3

Here is a code sample that loads a JPEG, changes any red pixels in the image to blue, and then displays the bitmap in a picture box:

Bitmap bmp = (Bitmap)Bitmap.FromFile("image.jpg");
for (int x = 0; x < bmp.Width; x++)
{
    for (int y = 0; y < bmp.Height; y++)
    {
        if (bmp.GetPixel(x, y) == Color.Red)
        {
            bmp.SetPixel(x, y, Color.Blue);
        }
    }
}
pictureBox1.Image = bmp;

Warning: GetPixel and SetPixel are incredibly slow. If your images are large and/or performance is an issue, there is a much faster way to read and write pixels in .NET, but it's a little bit more work.