如何把PictureBox1中的图像另存为JPG的时候,并把图像大小设为宽21cm,高29cm??

[zjh222]

如何把PictureBox1中的图像另存为JPG的时候,并把图像大小设为宽21cm,高29cm??

[zgke]

不知道对不对

  private void button1_Click(object sender, EventArgs e)
        {
            Size _CMSzie =GetSizeF(21,29,96);  //1024*768 为DPI 96

            Bitmap _NewBmp = new Bitmap(_CMSzie.Width,_CMSzie.Height);

            Graphics _Graphics = Graphics.FromImage(_NewBmp);
            _Graphics.DrawImage(pictureBox1.Image, 0, 0, _CMSzie.Width, _CMSzie.Height);
            _Graphics.Dispose();

            _NewBmp.Save(@"C:\11.bmp");



           
        }

        public Size GetSizeF(int p_WidthCM, int p_HeightCM,int p_DPI)
        {
            //象素数 / DPI = 英寸数
            //英寸数 * 25.4 = 毫米数 
            double _Witdh = (p_WidthCM * 10)/25.4;
            double _Height = (p_HeightCM * 10)/25.4;

            return new Size((int)_Witdh * p_DPI, (int)_Height * p_DPI);
        }

[子夜1978]

1楼方法应该可行！学习！

[LorenLiu]

个人觉得使用PictureBox的DrawToBitmap来得到Bitmap对象比较好点