Here we save a transparent gif using the color white as the
transparent color.
[C#]
using (Bitmap bm = (Bitmap)Bitmap.FromFile(Server.MapPath("rez/jeremy-bishop-_CFv3bntQlQ-unsplash.jpg"))) {
Color color = Color.White;
EncoderParameters pars = new EncoderParameters() { TransparentColor = color };
pars.Palette = new ColorPaletteType(ColorPaletteFamily.Adaptive, 16);
pars.Palette.FixedColors = new List<Color>(new Color[] { color });
bm.Save(Server.MapPath("IG8_EncoderParameters_TransparentColor.gif"), ImageFormat.Gif, pars);
}

jeremy-bishop-_CFv3bntQlQ-unsplash.jpg

IG8_EncoderParameters_TransparentColor.gif
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