Question

Im trying to save a bitmap jpg format with a specified encoding quality. However im getting an exception (‘Parameter is not valid.’) when calling the save method.

If i leave out the two last parameters in the bmp.save it works fine.

        EncoderParameters eps = new EncoderParameters(1);         eps.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 16);         ImageCodecInfo ici = GetEncoderInfo('image/jpeg');         string outfile = outputpath + '\\' + fileaddition + sourcefile.Name;         bmp.Save(outfile,ici,eps );          bmp.Dispose();         image.Dispose();         return true;     }     ImageCodecInfo GetEncoderInfo(string mimeType)     {         int j;         ImageCodecInfo[] encoders;         encoders = ImageCodecInfo.GetImageEncoders();         for (j = 0; j < encoders.Length; ++j)         {             if (encoders[j].MimeType == mimeType)                 return encoders[j];         }         return null;     } } 

Thank you

Answer 1

GDI+ is pretty flaky. You’ll need to use 16L for the value or cast to (long).