private static void GetImageStream( ImageFormat outputFormat, Bitmap bitmap, MemoryStream ms )
{
var imageEncoders = ImageCodecInfo.GetImageEncoders ();
var encoderParameters = new EncoderParameters (1);
encoderParameters.Param[0] = new EncoderParameter (Encoder.Quality, 100L);
if (ImageFormat.Jpeg.Equals (outputFormat))
{
bitmap.Save (ms, imageEncoders[1], encoderParameters);
}
else if (ImageFormat.Png.Equals (outputFormat))
{
bitmap.Save (ms, imageEncoders[4], encoderParameters);
}
else if (ImageFormat.Gif.Equals (outputFormat))
{
var quantizer = new OctreeQuantizer (255, 8);
using (var quantized = quantizer.Quantize (bitmap))
{
quantized.Save (ms, imageEncoders[2], encoderParameters);
}
}
else if (ImageFormat.Bmp.Equals (outputFormat))
{
bitmap.Save (ms, imageEncoders[0], encoderParameters);
}
else
{
bitmap.Save (ms, outputFormat);
}
}