saving a ".gif" image gives me problems

[monfu]

Dear all

I have the following code:-

System.Drawing.Image src_image =
System.Drawing.Image.FromStream(imgStream);

Bitmap bitmap = new Bitmap(image_width, image_height,
src_image.PixelFormat);
Graphics new_g = Graphics.FromImage(bitmap);
new_g.SmoothingMode =
System.Drawing.Drawing2D.SmoothingMode.HighQuality ;
new_g.InterpolationMode =
System.Drawing.Drawing2D.InterpolationMode.HighQua lityBicubic;
new_g.SmoothingMode = SmoothingMode.HighQuality;
new_g.CompositingQuality =
System.Drawing.Drawing2D.CompositingQuality.HighQu ality;
new_g.CompositingMode =
System.Drawing.Drawing2D.CompositingMode.SourceCop y;

new_g.DrawImage(src_image, 0, 0, bitmap.Width, bitmap.Height);
new_g.Save();
src_image.Dispose();

System.Drawing.Imaging.Encoder Enc =
System.Drawing.Imaging.Encoder.Transformation;
EncoderParameters EncParms = new EncoderParameters(1);

EncParms.Param = new EncoderParameter[]
{
new EncoderParameter(Enc,(long)EncoderValue.Compressio nLZW),
new EncoderParameter(System.Drawing.Imaging.Encoder.Qu ality,
100L)
};

ImageCodecInfo ici ;

ici = GetProperEncoder(image_name);

string newFullPath = path + image_name;

bitmap.Save(newFullPath, System.Drawing.Imaging.ImageFormat.Jpeg);

bitmap.Dispose();
new_g.Dispose();

which is working fine when i upload a "jpg" image. However, when i
tried to upload a ".gif" image, it is not working fine. It is giving
me the following error:-

"A Graphics object cannot be created from an image that has an indexed
pixel format."

I am not saving the image prior to uploading, just putting it in a
stream and saving the image after the manipulation is done.

Thanks for your help

Johann
--
monfu
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