Convert Image in Byte array with the same PixelFormat

Question

Hi

I had a System.Drawing.Image object with PixelFormat.Format8bppIndexed,

If I convert it in a Byte Array through Image.Save(Stream, ImageFormat), and create a new image based in this Byte Array, the new image has PixelFormat.Format24bppRgb.

My final purpose is to send the image in Base64String, but preserve the format of the image.

¿How can I do that?

Regards

Answer 1

@Abraham Carrillo , Welcome to Microsoft Q&A, you could convert your image to Bitmap and then you could use Bitmap set the PixelFormat.

Here is a code example you could refer to.

      private void button1_Click(object sender, EventArgs e)
        {
            Image img = Image.FromFile("C:\\Users\\Administrator\\Desktop\\Icon.bmp");
            Console.WriteLine(img.PixelFormat);
            var brr=ImageToByteArray(img);
            Image newimg=byteArrayToImage(brr,img.PixelFormat);
            Console.WriteLine(newimg.PixelFormat);
        }

        public byte[] ImageToByteArray(System.Drawing.Image imageIn)
        {
            using (var ms = new MemoryStream())
            {
                imageIn.Save(ms, imageIn.RawFormat);
                return ms.ToArray();
            }
        }
        public Image byteArrayToImage(byte[] byteArrayIn, PixelFormat format)
        {
            MemoryStream ms = new MemoryStream(byteArrayIn);
            Image returnImage = Image.FromStream(ms);
            Bitmap bitmap=(Bitmap)returnImage;
            Bitmap clone = new Bitmap(bitmap.Width, bitmap.Height,format);
            using (Graphics gr = Graphics.FromImage(clone))
            {
                gr.DrawImage(bitmap, new Rectangle(0, 0, clone.Width, clone.Height));
            }
            return clone;
        }

Hope my code could help you.

Best Regards,

Jack

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