Winform.net如何实现摄像头拍一寸或二寸规格的照片并保存

Question

        /// <summary>
        /// 生成缩略图
        /// </summary>
        /// <param name="originalImagePath">源路径</param>
        /// <param name="thumbnailPath">目标路径</param>
        /// <param name="width">宽</param>
        /// <param name="height">高</param>
        /// <param name="mode">缩略模式</param>
        public static Image MakeThumbnail(string originalImagePath, int width, int height, string mode)
        {
            Image originalImage = Image.FromFile(originalImagePath);            int towidth = width;
            int toheight = height;            int x = 0;
            int y = 0;
            int ow = originalImage.Width;
            int oh = originalImage.Height;            switch (mode)
            {
                case "HW"://指定高宽缩放（可能变形）                
                    break;
                case "W"://指定宽，高按比例                    
                    toheight = originalImage.Height * width / originalImage.Width;
                    break;
                case "H"://指定高，宽按比例
                    towidth = originalImage.Width * height / originalImage.Height;
                    break;
                case "Cut"://指定高宽裁减（不变形）                
                    if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
                    {
                        oh = originalImage.Height;
                        ow = originalImage.Height * towidth / toheight;
                        y = 0;
                        x = (originalImage.Width - ow) / 2;
                    }
                    else
                    {
                        ow = originalImage.Width;
                        oh = originalImage.Width * height / towidth;
                        x = 0;
                        y = (originalImage.Height - oh) / 2;
                    }
                    break;
                default:
                    break;
            }            //新建一个bmp图片
            Image bitmap = new System.Drawing.Bitmap(towidth, toheight);            //新建一个画板
            Graphics g = System.Drawing.Graphics.FromImage(bitmap);            //设置高质量插值法
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;            //设置高质量,低速度呈现平滑程度
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;            //清空画布并以透明背景色填充
            g.Clear(Color.Transparent);            //在指定位置并且按指定大小绘制原图片的指定部分
            g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
                new Rectangle(x, y, ow, oh),
                GraphicsUnit.Pixel);
            return bitmap;
        }

Answer 1

public static Bitmap KiRotate(Bitmap img)
        {
            try
            {                
                img.RotateFlip(RotateFlipType.Rotate90FlipNone);
                return img;
            }
            catch
            {
                return null;
            }
        }/*解释：
顺时针旋转90度     RotateFlipType.Rotate90FlipNone
逆时针旋转90度     RotateFlipType.Rotate270FlipNone
水平翻转    RotateFlipType.Rotate180FlipY
垂直翻转    RotateFlipType.Rotate180FlipX
*/
这个是旋转的。旋转之后再试试之前对图片大小的处理

Answer 2

问题解决了 结贴给分吧
我按你的方法稍加改动后能够截出我想要的区域了，在界面中我将左右两边各挡住一部份，使之看起来是类似一寸照的规格样式，截的时候也截取这部分内容，最终实现了，非常感谢！
ni
你是怎么实现剪裁的啊  比如说摄像头拍摄后我截取120x160大小的图片，然后保存，像大头贴那样，不是压缩哈