C# 如何在运行时更改图像的颜色
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How to change color of Image at runtime
提问by
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 having a dropdown List which gives me the various color option like red,gree,etc. I would now like to change the color of the Image to the one selected in the droprdown List.
我想知道有什么方法可以在运行时更改图像颜色。例如，假设我有一个 JPG 绑定到 ASP.Net 的图像控件。接下来，我有一个下拉列表，它为我提供了各种颜色选项，如红色、绿色等。我现在想将图像的颜色更改为下拉列表中选择的颜色。
回答by MusiGenesis
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:
下面是一个代码示例，它加载 JPEG，将图像中的任何红色像素更改为蓝色，然后在图片框中显示位图：
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.
警告：GetPixel 和 SetPixel 非常慢。如果您的图像很大和/或性能有问题，那么在 .NET 中读取和写入像素的速度要快得多，但需要做更多的工作。
回答by MaRaM
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.
我也面临着这个问题下的麻烦。之后根据一些信息。我手动编写了代码。现在它运行良好。如果你想检查，你可以使用它。
code for change the background image during runtime in C#.net
在 C#.net 中运行时更改背景图像的代码
you can use simply this code. That is, ==>
您可以简单地使用此代码。也就是说，==>
string str;
OpenFileDialog od = new OpenFileDialog();
if (od.ShowDialog() == DialogResult.OK)
{
str = od.FileName;
this.BackgroundImage=Image.FromFile(str);
}
回答by Mohit Verma
You also try this for web (asp.net) , you can ignore the logic but can see what getpixel & setpixel doing
你也可以在 web (asp.net) 上试试这个，你可以忽略逻辑，但可以看到 getpixel 和 setpixel 在做什么
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);
}
