Image printing with Epson compatible Thermal printer problem

Question

I am using C# and write code for print contents for the Thermal ticket printer.

There are codes that people use for image print, and it indeed prints images, but something goes wrong. This is my code for image print class, it is widely using open source (I googled and found it, and people successfully implement this code to theirs without problem).

public static class ImagePrint
{
    /// <summary>
    /// Image convert to Byte Array
    /// </summary>
    /// <param name="LogoPath">Image Path</param>
    /// <param name="printWidth">Image print Horizontal Length</param>
    /// <returns></returns>
    public static byte[] GetLogo(string LogoPath, int printWidth)
    {
        List<byte> byteList = new List<byte>();
        if (!File.Exists(LogoPath))
            return null;
        BitmapData data = GetBitmapData(LogoPath, printWidth);
        BitArray dots = data.Dots;
        byte[] width = BitConverter.GetBytes(data.Width);

        int offset = 0;
        // Initialize Printer
        byteList.Add(Convert.ToByte(Convert.ToChar(0x1B)));
        byteList.Add(Convert.ToByte('@'));

        // Line Spacing Adjust (24/180 inch)
        byteList.Add(Convert.ToByte(Convert.ToChar(0x1B)));
        byteList.Add(Convert.ToByte('3'));
        byteList.Add((byte)24);
        while (offset < data.Height)
        {
            byteList.Add(Convert.ToByte(Convert.ToChar(0x1B)));
            byteList.Add(Convert.ToByte('*'));
            byteList.Add((byte)33);
            byteList.Add(width[0]);
            byteList.Add(width[1]);

            for (int x = 0; x < data.Width; ++x)
            {
                for (int k = 0; k < 3; ++k)
                {
                    byte slice = 0;
                    for (int b = 0; b < 8; ++b)
                    {
                        int y = (((offset / 8) + k) * 8) + b;
                        int i = (y * data.Width) + x;

                        bool v = false;
                        if (i < dots.Length)
                            v = dots[i];

                        slice |= (byte)((v ? 1 : 0) << (7 - b));
                    }
                    byteList.Add(slice);
                }
            }
            offset += 24;
            byteList.Add(Convert.ToByte(0x0A));
        }

        // Return to normal line spacing (30/160 inch)
        byteList.Add(Convert.ToByte(0x1B));
        byteList.Add(Convert.ToByte('3'));
        byteList.Add((byte)30);
        return byteList.ToArray();
    }

    private static BitmapData GetBitmapData(string bmpFileName, int width)
    {
        using (var bitmap = (Bitmap)Bitmap.FromFile(bmpFileName))
        {
            var threshold = 127;
            var index = 0;
            double multiplier = width; // 이미지 width조정
            double scale = (double)(multiplier / (double)bitmap.Width);
            int xheight = (int)(bitmap.Height * scale);
            int xwidth = (int)(bitmap.Width * scale);
            var dimensions = xwidth * xheight;
            var dots = new BitArray(dimensions);

            for (var y = 0; y < xheight; y++)
            {
                for (var x = 0; x < xwidth; x++)
                {
                    var _x = (int)(x / scale);
                    var _y = (int)(y / scale);
                    var color = bitmap.GetPixel(_x, _y);
                    var luminance = (int)(color.R * 0.3 + color.G * 0.59 + color.B * 0.11);
                    dots[index] = (luminance < threshold);
                    index++;
                }
            }

            return new BitmapData()
            {
                Dots = dots,
                Height = (int)(bitmap.Height * scale),
                Width = (int)(bitmap.Width * scale)
            };
        }
    }

    private class BitmapData
    {
        public BitArray Dots
        {
            get;
            set;
        }

        public int Height
        {
            get;
            set;
        }

        public int Width
        {
            get;
            set;
        }
    }
}

And I use this code like this on my code for image print:

string Image_File_Path = @"D:\TEST\TESTImage.bmp";
int Image_Size_I_Want = 100;
byte[] img = ImagePrint.GetLogo(Image_File_Path, Image_Size_I_Want);
port.Write(img, 0, img.Length);

You can see the result in the attached picture.
There are white space lines on the image.
This class automatically adds a line spacing command, but it seems does not work.
Please suggest any solution.

Answer 1

Using 'mike42/escpos-php' package in laravel

use Mike42\Escpos\Printer;
use Mike42\Escpos\EscposImage;

 $tux = EscposImage::load(public_path()."\assets\img\path-to-file.jpg");
 $printer->setJustification(Printer::JUSTIFY_CENTER);
 $printer->bitImage($tux, 0);
 $printer -> setJustification();