在 C#/.NET 中合并两个图像
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Merging two images in C#/.NET
提问by thr
Simple idea: I have two images that I want to merge, one is 500x500 that is transparent in the middle the other one is 150x150.
简单的想法：我有两个要合并的图像，一个是 500x500，中间是透明的，另一个是 150x150。
Basic idea is this: Create an empty canvas that is 500x500, position the 150x150 image in the middle of the empty canvas and then copy the 500x500 image over so that the transparent middle of it allows the 150x150 to shine through.
基本思想是这样的：创建一个 500x500 的空画布，将 150x150 的图像放在空画布的中间，然后将 500x500 的图像复制过来，这样它的透明中间就可以让 150x150 的图像透过。
I know how to do it in Java, PHP and Python... I just don't have any idea what objects/classes to use in C#, a quick example of copying an images into another would suffice.
我知道如何在 Java、PHP 和 Python 中做到这一点......我只是不知道在 C# 中使用什么对象/类，一个将图像复制到另一个图像的快速示例就足够了。
采纳答案by Andreas Niedermair
basically i use this in one of our apps: we want to overlay a playicon over a frame of a video:
基本上我在我们的一个应用程序中使用它：我们想在视频帧上覆盖一个播放图标：
Image playbutton;
try
{
playbutton = Image.FromFile(/*somekindofpath*/);
}
catch (Exception ex)
{
return;
}
Image frame;
try
{
frame = Image.FromFile(/*somekindofpath*/);
}
catch (Exception ex)
{
return;
}
using (frame)
{
using (var bitmap = new Bitmap(width, height))
{
using (var canvas = Graphics.FromImage(bitmap))
{
canvas.InterpolationMode = InterpolationMode.HighQualityBicubic;
canvas.DrawImage(frame,
new Rectangle(0,
0,
width,
height),
new Rectangle(0,
0,
frame.Width,
frame.Height),
GraphicsUnit.Pixel);
canvas.DrawImage(playbutton,
(bitmap.Width / 2) - (playbutton.Width / 2),
(bitmap.Height / 2) - (playbutton.Height / 2));
canvas.Save();
}
try
{
bitmap.Save(/*somekindofpath*/,
System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (Exception ex) { }
}
}
回答by Dustin Brooks
This will add an image to another.
这会将图像添加到另一个图像。
using (Graphics grfx = Graphics.FromImage(image))
{
grfx.DrawImage(newImage, x, y)
}
Graphics is in the namespace System.Drawing
图形在命名空间中 System.Drawing
回答by Anant Dabhi
After all this, I found a new easier method try this ..
毕竟，我发现了一个新的更简单的方法试试这个..
It can join multiple photos together:
它可以将多张照片连接在一起：
public static System.Drawing.Bitmap CombineBitmap(string[] files)
{
//read all images into memory
List<System.Drawing.Bitmap> images = new List<System.Drawing.Bitmap>();
System.Drawing.Bitmap finalImage = null;
try
{
int width = 0;
int height = 0;
foreach (string image in files)
{
//create a Bitmap from the file and add it to the list
System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(image);
//update the size of the final bitmap
width += bitmap.Width;
height = bitmap.Height > height ? bitmap.Height : height;
images.Add(bitmap);
}
//create a bitmap to hold the combined image
finalImage = new System.Drawing.Bitmap(width, height);
//get a graphics object from the image so we can draw on it
using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(finalImage))
{
//set background color
g.Clear(System.Drawing.Color.Black);
//go through each image and draw it on the final image
int offset = 0;
foreach (System.Drawing.Bitmap image in images)
{
g.DrawImage(image,
new System.Drawing.Rectangle(offset, 0, image.Width, image.Height));
offset += image.Width;
}
}
return finalImage;
}
catch (Exception ex)
{
if (finalImage != null)
finalImage.Dispose();
throw ex;
}
finally
{
//clean up memory
foreach (System.Drawing.Bitmap image in images)
{
image.Dispose();
}
}
}
