Winform.net如何实现摄像头拍一寸或二寸规格的照片并保存
例如一个考试现场直接拍了,并打印出来,规格是一寸或两寸的。
这其中有重新处理的过程吗?
目前我做的拍出来的照片是摄像头整个拍摄的大小。
怎么做调整能实现这样的效果?
[最优解释]
/// <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;
}
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