调整大小并压缩jpeg [英] Resize and compress jpeg

问题描述

我看到 this 捕获屏幕的教程，我做了一些编辑，结果是好的，

但每个图像的分辨率是1366，768

&p我希望它像683，384

但我得到的只是图像的一部分

这是我的代码： p>

  private void显示（位图桌面）
 {
 if（desktop！= null）
 { 
 Bitmap bmp = new Bitmap（1366，768）; 
 using（Graphics g = Graphics.FromImage（bmp））
 {
 g.DrawImage（desktop，Point.Empty）; 
} 
 
 MemoryStream stream = new MemoryStream（）; 
 Image myImg =（bmp as Image）; 
 myImg.Save（stream，System.Drawing.Imaging.ImageFormat.Jpeg）; 
 byte [] pic = stream.ToArray（）; 
 
 ssWithMouseViewer.Image = myImg; 
 dataGridView1.Rows.Add（pic）; 
} 
} 
  

这是我的表单：

我想以分辨率为683,384和更低质量的datagridview图像存储。

解决方案

而不是 g.DrawImage（desktop，Point.Empty）; 使用 g.DrawImage（desktop，0，0，bmp.Width，bmp.Height）;

并创建位图，如 Bitmap bmp = new Bitmap（683,384）; / p>

i seen this tutorial of capture screen and i did some edit to it and the result is good,

but the resolution of each image is 1366, 768

and i want it to be like 683, 384

but all i get is part of the image

here is my code:

private void Display(Bitmap desktop)
{
    if (desktop != null)
    {
        Bitmap bmp = new Bitmap(1366, 768);
        using (Graphics g = Graphics.FromImage(bmp))
        {
            g.DrawImage(desktop, Point.Empty);
        }

        MemoryStream stream = new MemoryStream();
        Image myImg = (bmp as Image);
        myImg.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
        byte[] pic = stream.ToArray();

        ssWithMouseViewer.Image = myImg;
        dataGridView1.Rows.Add(pic);
    }
}

here is my form:

i want to store in the datagridview images with resolution of 683, 384 and less qualty.

解决方案

instead of g.DrawImage(desktop, Point.Empty); use g.DrawImage(desktop, 0, 0, bmp.Width, bmp.Height);

and create bitmap like Bitmap bmp = new Bitmap(683, 384);

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