iot/projects/Infrastructure/Extensions/BitmapExtensions.cs

using System.Drawing;
using System.Drawing.Imaging;
using System.IO;

namespace Infrastructure.Extensions
{
    public static class BitmapExtensions
    {
        public static byte[] ToBytes(this Bitmap bitmap)
        {
            if (bitmap is null)
            {
                throw new System.ArgumentNullException(nameof(bitmap));
            }

            using var stream = new MemoryStream();
            bitmap.Save(stream, ImageFormat.Jpeg);
            return stream.ToArray();
        }

        public static byte[] ToJpeg(this Bitmap bitmap, long quality = 50)
        {
            if (bitmap is null)
            {
                throw new System.ArgumentNullException(nameof(bitmap));
            }

            var jpgEncoder = GetEncoder(ImageFormat.Jpeg);
            using var parameters = new EncoderParameters(1);
            parameters.Param[0] = new EncoderParameter(Encoder.Quality, quality);
            using var stream = new MemoryStream();
            bitmap.Save(stream, jpgEncoder, parameters);
            return stream.ToArray();
        }

        private static ImageCodecInfo GetEncoder(ImageFormat format)
        {
            ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();
            foreach (ImageCodecInfo codec in codecs)
            {
                if (codec.FormatID == format.Guid)
                {
                    return codec;
                }
            }
            return null;
        }
    }
}