//API declaration
[System.Runtime.InteropServices.DllImport("gdi32.dll")]
        public static extern int SetDIBitsToDevice(IntPtr hDC, int DestX, int DestY, uint wDestWidth, uint wDestHeight, int SrcX, int SrcY, uint uStartScan, uint uScanLines, byte[] lpBits, ref BITMAPINFO BitsInfo, uint uColorUse);

[System.Runtime.InteropServices.DllImport("gdi32.dll")]
        public static extern IntPtr CreateCompatibleDC(IntPtr hDC);

//Structures
public struct PALETTEENTRY
        {
            public byte peRed;
            public byte peGreen;
            public byte peBlue;
            //public byte peFlags;
        }

        public struct BITMAPINFOHEADER
        {
            public uint biSize;
            public int biWidth;
            public int biHeight;
            public ushort biPlanes;
            public ushort biBitCount;
            public uint biCompression;
            public uint biSizeImage;
            public int biXPelsPerMeter;
            public int biYPelsPerMeter;
            public uint biClrUsed;
            public uint biClrImportant;
        }
        public struct BITMAPINFO
        {
            public BITMAPINFO(BITMAPINFOHEADER bmiHeader)
            {
                this.bmiHeader = bmiHeader;
                bmiColors = new PALETTEENTRY[256];
            }
            public BITMAPINFOHEADER bmiHeader;
            public PALETTEENTRY[] bmiColors;
        }

        public const int BI_RGB = 0;
        public const int DIB_RGB_COLORS = 0;

byte[] data = System.IO.File.ReadAllBytes("test.rgb");

//arranging bits to display RGB file correctly
byte[] data3 = (new ReadImage(ref data)).ReadChannels();

                PrintImage.BITMAPINFOHEADER bmiHeader = new PrintImage.BITMAPINFOHEADER();
                bmiHeader.biSize = (uint)System.Runtime.InteropServices.Marshal.SizeOf(bmiHeader);
                bmiHeader.biWidth = 400;
                bmiHeader.biHeight = -400;
                //bmiHeader.biPlanes = 1;
                bmiHeader.biBitCount = 24;
                //bmiHeader.biClrUsed = 0;
                //bmiHeader.biClrImportant = 0;
                bmiHeader.biCompression = PrintImage.BI_RGB;
                bmiHeader.biSizeImage = 400 * 400;

                PrintImage.BITMAPINFO bmi = new PrintImage.BITMAPINFO(bmiHeader);

                IntPtr lhDC = PrintImage.CreateCompatibleDC(PrintImage.GetWindowDC(pictureBox1.Handle));

                int test = PrintImage.SetDIBitsToDevice(lhDC, 0, 0, 400, 400, 0, 0, 0, 400, data3, ref bmi, PrintImage.DIB_RGB_COLORS);