Create or save bitmap pixelformat.format8bppindexed

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C#

Create or Save bitmap PixelFormat.Format8bppIndexed

Bitmap bitmap = new Bitmap(100, 100, PixelFormat.Format8bppIndexed);
panel1.DrawToBitmap(bitmap, new System.Drawing.Rectangle(0, 0, 100, 100));
bitmap.Save(@"c:\\test.bmp", ImageFormat.Bmp);


System.Exception: 'A Graphics object cannot be created from an image that has an indexed pixel format.'

What I have tried:

Bitmap bitmap = new Bitmap(100, 100, PixelFormat.Format8bppIndexed);
panel1.DrawToBitmap(bitmap, new System.Drawing.Rectangle(0, 0, 100, 100));
bitmap.Save(@"c:\\test.bmp", ImageFormat.Bmp);