Question

What i’m trying to do is write a string to an image without overlapping the image. So i want to watermark an image putting the watermark (string) at the bottom without actually affecting the image or stretching the image out. I already know how to turn a string into an image, just having problems accomplishing the watermark.

1) Write string to Image on bottom right hand side
2) don’t stretch the original image
3) extend the bitmap a little bit to include watermark?

Does anybody have an example or an idea where to start? If i don’t make any sense i’ll try to answer any questions.

Bitmap example:

here is the code I use to get the bitmap, how do I increase just the size by X like 20?

Bitmap original = (Bitmap)System.Drawing.Image.FromFile(coveted);
Bitmap newImage = new Bitmap(original);

And I guess the 2nd part is how do i determine the space that I need in order to write out a string to the very bottom right of the image, while fitting in the entire string…

@ROY: This is the edit that i did.

This sorta works but the one watermark appears below the other. if i could get them on the same line it would be perfect!

private static Bitmap WatermarkImage2(Bitmap bmpOriginal, String waterMark2)
    {
        using (Graphics gfxOriginal = Graphics.FromImage(bmpOriginal))
        {
            using (Font fntWatermark = new Font("Arial", 24, FontStyle.Regular))
            {
                SizeF szWatermark = gfxOriginal.MeasureString(waterMark2, fntWatermark, int.MaxValue);
                Bitmap bmpWatermarked2 = new Bitmap(bmpOriginal.Width, bmpOriginal.Height + (int)(szWatermark.Height * 2));
                using (Graphics gfxWatermarked = Graphics.FromImage(bmpWatermarked2))
                {
                    gfxWatermarked.Clear(Color.White);
                    gfxWatermarked.DrawImageUnscaled(bmpOriginal, 0, 0);
                    gfxWatermarked.DrawString(waterMark2, fntWatermark, Brushes.Black, 0, (bmpOriginal.Height + szWatermark.Height) - (szWatermark.Height / 2));
                }
                return bmpWatermarked2;
            }
        }
    }

Answer 1

This may work for you:

    private static Bitmap WatermarkImage(Bitmap bmpOriginal, String waterMarkLeft, String waterMarkRight)
    {
        using (Graphics gfxOriginal = Graphics.FromImage(bmpOriginal))
        {
            using (Font fntWatermark = new Font("Arial", 12, FontStyle.Regular))
            {                    
                SizeF szWatermarkLeft = gfxOriginal.MeasureString(waterMarkLeft, fntWatermark, int.MaxValue);
                SizeF szWatermarkRight = gfxOriginal.MeasureString(waterMarkRight, fntWatermark, int.MaxValue);

                float heightWatermark = szWatermarkLeft.Height > szWatermarkRight.Height ? szWatermarkLeft.Height : szWatermarkRight.Height;

                Bitmap bmpWatermarked = new Bitmap(bmpOriginal.Width, bmpOriginal.Height + (int)(heightWatermark * 2));

                using (Graphics gfxWatermarked = Graphics.FromImage(bmpWatermarked))
                {
                    gfxWatermarked.Clear(Color.White);
                    gfxWatermarked.DrawImageUnscaled(bmpOriginal, 0, 0);
                    gfxWatermarked.DrawString(waterMarkLeft, fntWatermark, Brushes.Black, 0, (bmpOriginal.Height + heightWatermark) - (szWatermarkLeft.Height / 2));
                    gfxWatermarked.DrawString(waterMarkRight, fntWatermark, Brushes.Black, (bmpOriginal.Width - szWatermarkRight.Width), (bmpOriginal.Height + heightWatermark) - (heightWatermark / 2));                        
                }

                return bmpWatermarked;                                        
            }
        }
    }

Then you would call it like this:

using (Bitmap bmpWatermarked = WatermarkImage((Bitmap)Bitmap.FromFile(@"c:\\test.bmp"), @"Copyright (C) A Corp."))
{
    bmpWatermarked.Save(@"c:\watermarked.bmp");
}

Combined with your code above:

Bitmap original = (Bitmap)System.Drawing.Image.FromFile(coveted); 
Bitmap newImage = new Bitmap(original); 
using (Bitmap bmpWatermarked = WatermarkImage(newImage, @"Copyleft (C) A Corp.", @"Copyright (C) B Corp."))
{
  bmpWatermarked.Save(@"c:\watermarked.bmp");
}