C#

Keith Barrow wrote:

As a second point filename looks odd set aside filePath

Ylno wrote:

PixelFormat.Format24bppRgb

row[i * PixelDepth] = pixVal;

....... code to write the bitmap header here ........
for (int j = Height - 1; j >= 0; j--)
{
    for (int i = 0; i < Width; i++)
    {
        pixVal = (byte)(PixelScaleFactor * (_internalPixelArray[i, j] - PixelOffset));
        buffer.writeByte(pixVal);
        buffer.writeByte(pixVal);
        buffer.writeByte(pixVal);
        buffer.writeByte(0);        // the alpha channel.
    }
}

Image.FromStream(new System.IO.MemoryStream(imageData))

Ylno wrote:

2) using bmp.PixelFormat (see below)

Luc Pattyn wrote:

I don't see it!

//  DEFINE AN IMAGE ALONG WITH ITS DIMENSIONS
// 24bpp -> three channels each of one byte depth
int width = 1000;
int height = 1000;
byte[] pixelVector = new byte[width * height * 3];
// FILL THE PIXELS WITH SOMEDATA AVOIDING OVERFLOW
for (int loop = 0; loop < (width * height ); loop+=3)
{
    pixelVector[loop]       = (byte)((loop * 256) / (width * height ));
    pixelVector[loop + 1]   = (byte)((loop * 256) / (width * height ));
    pixelVector[loop + 2]   = (byte)((loop * 256) / (width * height ));
}

// CREATE THE DESTINATION BITMAP WITH THE REQUIRED PIXEL-DEPTH
Bitmap bmp = new Bitmap(width, height, PixelFormat.Format24bppRgb);
// LOCK IT'S DATA FOR EXCLUSIVE ACCESS
BitmapData bmpData = bmp.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, bmp.PixelFormat);
unsafe
{
    // GET THE ADDRESS OF THE FIRST PIXEL IN MEMORY
    byte* row = (byte*)bmpData.Scan0;
    // LOOP THROUGH THE PIXEL-DATA FILLING ONE PIXEL PER
    // ITERATION (THREE PIXELS PER CHANNEL)
    for (int loop = 0; loop < (pixelVector.Length*3); loop+=3){
        row[loop]   =   pixelVector[loop/3];        //
        row[loop + 1] = pixelVector[loop/3 ];
        row[loop + 2] = pixelVector[loop/3 ];
    }
}
bmp.UnlockBits(bmpData);

pictureBox1.Image = bmp;

// on error resume next;
for (int i=1; i<10; i++) {
    outp("table of "+i);
    for(int j=1; j<10; j++) {
        int k=j*i;
        outp("    "+j+" * "+i+" = "+k);
    }
    outp("");
}