C#：使用 Graphics.DrawImage 保留不同分辨率的大小

发布于 2024-07-21 15:52:41 字数 586 浏览 10 评论 0原文

我正在尝试使用 C# 绘图命名空间并排绘制两个图像。这是一个非常简单的示例，假设我们有两个高度相同的图像：

Image[] oldImages = GetOldImages();

var newImage = new Bitmap(oldImages[0].Width + oldImages[1].Width, 800);

using (var newImageGraphics = Graphics.FromImage(newImage))
{
    newImageGraphics.DrawImage(oldImages[0], 0, 0);
    newImageGraphics.DrawImage(oldImages[1], oldImage[0].Width, 0);
    newImageGraphics.Save();
}

如果两个旧图像的分辨率相同，则此方法可以正常工作。

但是，如果分辨率不同，则会调整图像大小，从而导致问题。例如，如果第一张图像具有不同的分辨率，则第二张图像的位置将不正确。

有谁知道我如何轻松解决这个问题？理想情况下，我希望原始图像的高度和宽度在绘制到新图像上时保持不变。

原文

I am trying to draw two images side-by-side using the C# Drawing namespace.
Here is a very simple example that assumes we have two images of the same height:

Image[] oldImages = GetOldImages();

var newImage = new Bitmap(oldImages[0].Width + oldImages[1].Width, 800);

using (var newImageGraphics = Graphics.FromImage(newImage))
{
    newImageGraphics.DrawImage(oldImages[0], 0, 0);
    newImageGraphics.DrawImage(oldImages[1], oldImage[0].Width, 0);
    newImageGraphics.Save();
}

This works OK if the resolution of the two old images are the same.

However, if the resolutions are different then the image is resized, causing problems. For example, if the first image has a different resolution, then the second image will be positioned incorrectly.

Does anyone know how I can fix this problem easily? Ideally I want the original image's height and width to remain the same when they are drawn on to the new image.

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我做我的改变 2024-07-28 15:52:41

试试这个技巧：

Bitmap picture_1 = new Bitmap(picture_1_path);
Graphics graphics = Graphics.FromImage(picture_1);
Bitmap picture_2 = new Bitmap(picture_2_path);
picture_2.SetResolution(graphics.DpiX, graphics.DpiY);

//Then do with pictures anything

Try this trick:

Bitmap picture_1 = new Bitmap(picture_1_path);
Graphics graphics = Graphics.FromImage(picture_1);
Bitmap picture_2 = new Bitmap(picture_2_path);
picture_2.SetResolution(graphics.DpiX, graphics.DpiY);

//Then do with pictures anything

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