How to Save the Barcode in 4 Bit/Pixel Format?

How to Save the Barcode in 4 Bit/Pixel Format?

First generate the barcode in the default Pixel format (Format32bppArgb):

System.Drawing.Size optimalSize = myBarcode.CalculateOptimalBitmapSize(null, 2, 2);
myBarcode.BoundingRectangle = new Rectangle(0, 0, optimalSize.Width, optimalSize.Height);
Bitmap barcodeImage = myBarcode.DrawBitmap();

Then convert it to a bitmap with the Pixel format you need:

Bitmap converted = barcodeImage.Clone (new Rectangle(0, 0, barcodeImage.Width, barcodeImage.Height), PixelFormat.Format4bppIndexed);
// MessageBox.Show(converted.PixelFormat.ToString());

Even if you use an escape sequence for binary data the encoder will use code page conversion (example: \x88 leads to a different value in Data Matrix as desired).

Solution:

• Switch off code page conversion (use encoding mode LowByte)
• Force binary encoding mode if available (see PDF417 encoding mode, Data Matrix EnforceBinaryEncoding)