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public byte[] MakeGrayScale(byte[] imageAsBytes)
UIImage image = ImageFromByteArray(imageAsBytes);
var height = image.Size.Height;
var width = image.Size.Width;
var imageRect = new CGRect(0, 0, width, height);
using (CGBitmapContext context = new CGBitmapContext(IntPtr.Zero,
(int)width, (int)height, 8,
0, CGColorSpace.CreateDeviceGray(),
// draw the image
context.DrawImage(imageRect, image.CGImage);
UIKit.UIImage copyImage = UIKit.UIImage.FromImage(context.ToImage(), 0, image.Orientation);
// save the image as a jpeg
return copyImage.AsJPEG().ToArray();
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