// using System.Drawing.Imaging;
// using System.IO;
private static ImageCodecInfo GetEncoderInfo(string MimeType)
{
ImageCodecInfo[] encs = ImageCodecInfo.GetImageEncoders();
foreach (ImageCodecInfo enc in encs)
{
if (enc.MimeType == MimeType) return enc;
}
return null;
}
{
using (FileStream fs = new FileStream(@"C:\sample1.jpg", FileMode.Open, FileAccess.Read))
using (Bitmap bmp = new Bitmap(Image.FromStream(fs)))
using (EncoderParameters eps = new EncoderParameters(1))
{
// 圧縮率を７０％に設定
eps.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)70);
ImageCodecInfo ici = GetEncoderInfo("image/jpeg");
bmp.Save(@"C:\sample2.jpg", ici, eps);
}
}
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