Hello,I wrote a method to convert image's color table.public class convert{ public static Bitmap bmp_convert(System.Drawing.Image pic) { Bitmap b = new Bitmap (pic); BitmapData bmData =b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format16bppArgb1555); b.UnlockBits(bmData); return b; }}unfortunately, I can't convert my image to Format8bppIndexed (or any indexed format) while to the other formats I can...(like: Format16bppArgb1555),why? and how can I fix it?