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/// <summary>
/// 生成小图片
/// </summary>
public static void SavePic(byte[] by, string path, int w, int h) //流,路径,宽度,高度
{
System.IO.MemoryStream ms = new System.IO.MemoryStream(by);
System.Drawing.Image image =
System.Drawing.Bitmap.FromStream(ms).GetThumbnailImage(w, h, null, IntPtr.Zero);
image.Save(path);
image.Dispose();
}
/// <summary>
/// 给图片加水印
/// </summary>
public static void SavePic(byte[] by, bool ck, string path) //流 是否加水印 路径
{
System.IO.MemoryStream ms = new System.IO.MemoryStream(by);
System.Drawing.Image image = System.Drawing.Image.FromStream(ms, true);
if (ck)
{
System.Drawing.Image newimage = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppRgb);
Graphics g = Graphics.FromImage(newimage);
g.DrawImage(image, 0, 0, image.Width, image.Height);
Font f = new Font("宋体", 14);
Brush b = new SolidBrush(Color.AntiqueWhite);
g.DrawString("www.cnbww.cn", f, b, 5, 5);
g.Dispose();
System.Drawing.Image thumbImage = newimage.GetThumbnailImage(image.Width, image.Height, null, new IntPtr());
thumbImage.Save(path);
thumbImage.Dispose();
}
else
{
image.Save(path);
}
image.Dispose();
}
**/**///// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImagePath">源图路径(物理路径)</param>
/// <param name="thumbnailPath">缩略图路径(物理路径)</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, 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 Bitmap(towidth, toheight);
//新建一个画板
Graphics g = Graphics.FromImage(bitmap);
//设置高质量插值法
g.InterpolationMode = InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = 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);
try
{
//以jpg格式保存缩略图
bitmap.Save(thumbnailPath, ImageFormat.Jpeg);
}
catch (Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}