PicReducer

ReducePicture.cs

        private static byte[] ReducePicture(string inputPath, int percentage, int quality = 75)
        {
            using (var originalImage = Image.FromFile(inputPath))
            {
                var newWidth = originalImage.Width * percentage / 100;
                var newHeight = originalImage.Height * percentage / 100;

                using (var resizedImage = new Bitmap(newWidth, newHeight))
                {
                    using (var graphics = Graphics.FromImage(resizedImage))
                    {
                        graphics.DrawImage(originalImage, 0, 0, newWidth, newHeight);
                    }

                    using (var memoryStream = new MemoryStream())
                    {
                        var codecs = ImageCodecInfo.GetImageDecoders();
                        var jpgEncoder = codecs.FirstOrDefault(codec => codec.FormatID == ImageFormat.Jpeg.Guid);
                        if (jpgEncoder == null)
                            throw new InvalidCastException("Jpg encoder doesn't exists.");
                        var encoderParameters = new EncoderParameters(1);
                        encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, quality);
                        resizedImage.Save(memoryStream, jpgEncoder, encoderParameters);
                        return memoryStream.ToArray();
                    }

                }
            }
        }