[ACCEPTED]-How to change color of Image at runtime-image
Accepted answer
Here is a code sample that loads a JPEG, changes 7 any red pixels in the image to blue, and 6 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 5 and SetPixel are incredibly slow. If your 4 images are large and/or performance is an 3 issue, there is a much faster way to read 2 and write pixels in .NET, but it's a little 1 bit more work.
You also try this for web (asp.net) , you 2 can ignore the logic but can see what getpixel 1 & 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);
}
Source:
stackoverflow.com
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