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我正在調整圖像大小併爲圖像添加水印。並返回圖像。這是我的代碼。重新調整大小並添加水印後控制圖像文件大小
Image resizedImage = ResizeImage(original6, new Size(500, 375));
重新大小功能：
public static System.Drawing.Image ResizeImage(System.Drawing.Image image, Size size)
{
int newWidth;
int newHeight;
if (true)
{
int originalWidth = image.Width;
int originalHeight = image.Height;
float percentWidth = (float)size.Width/(float)originalWidth;
float percentHeight = (float)size.Height/(float)originalHeight;
float percent = percentHeight < percentWidth ? percentHeight : percentWidth;
newWidth = (int)(originalWidth * percent);
newHeight = (int)(originalHeight * percent);
}
else
{
newWidth = size.Width;
newHeight = size.Height;
}
System.Drawing.Image newImage = new Bitmap(newWidth, newHeight);
using (Graphics graphicsHandle = Graphics.FromImage(newImage))
{
graphicsHandle.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphicsHandle.DrawImage(image, 0, 0, newWidth, newHeight);
}
System.Drawing.Bitmap bitmapimage = new System.Drawing.Bitmap(newImage, size.Width, size.Height);// create bitmap with same size of Actual image
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmapimage);
SolidBrush brush = new SolidBrush(Color.FromArgb(113, 255, 255, 255));
//Adding watermark text on image
g.DrawString("My watermark", new Font("Arial", 16, FontStyle.Bold), brush, 5, 100);
return bitmapimage;
}
我與水印檢索新的重新大小的圖像，並要保存爲新圖像文件。
resized6.Save(Server.MapPath(sSavePath + ownerRef + "Pic6v2" + ".jpg"));
這工作正常。但是我無法控制文件大小。 當我的原始JPG只有45kb，但當我的新的重新大小的圖像是500kb。我怎樣才能減小文件大小？ info：原始分辨率（400x300像素）和新圖像（500x375像素）