Automatically add watermark to an image

Question

while searching for a solution to automatically put a watermark to an image in internet, i found a best solution in stackoverflow. Link for the question is C# - Add watermark to the photo by special way. My special thanks to Alex Maslakov and adrift.

I implemented that solution with some modifications, i want to put watermark in center of the image. I modified the solution provided by adrift as follows

   private void button1_Click(object sender, EventArgs e)
    {
        using (Image image = Image.FromFile(@"C:\Users\Public\Pictures\Sample Pictures\Desert.jpg"))
        using (Image watermarkImage = Image.FromFile(@"C:\Users\Public\Pictures\Sample Pictures\watermark.png"))
        using (Graphics imageGraphics = Graphics.FromImage(image))
        using (Brush watermarkBrush = new TextureBrush(watermarkImage))
        {
            int x = (image.Width - watermarkImage.Width)/2;
            int y = (image.Height - watermarkImage.Height)/2;
            imageGraphics.FillRectangle(watermarkBrush, new Rectangle(new Point(x, y), watermarkImage.Size));
            image.Save(@"C:\Users\Public\Pictures\Sample Pictures\Desert_watermark.jpg");
        }

    }

but watermark is not properly placed in the center of image (see below image).

enter image description here

please correct me...

thanks

It honestly looks centered to me. Can you replace that watermark image with a box for clarity on where it's off? — Christopher Bales, Oct 13 '12 at 05:28

score 25 · Accepted Answer · edited May 23 '17 at 12:09

Finally i find the solution to my question...

The corrected code answer is following

    private void button1_Click(object sender, EventArgs e)
    {
        using (Image image = Image.FromFile(@"C:\Users\Public\Pictures\Sample Pictures\Desert.jpg"))
        using (Image watermarkImage = Image.FromFile(@"C:\Users\Public\Pictures\Sample Pictures\watermark.png"))
        using (Graphics imageGraphics = Graphics.FromImage(image))
        using (TextureBrush watermarkBrush = new TextureBrush(watermarkImage))
        {
            int x = (image.Width / 2 - watermarkImage.Width / 2);
            int y = (image.Height / 2 - watermarkImage.Height / 2);
            watermarkBrush.TranslateTransform(x, y);
            imageGraphics.FillRectangle(watermarkBrush, new Rectangle(new Point(x, y), new Size(watermarkImage.Width+1, watermarkImage.Height)));
            image.Save(@"C:\Users\Public\Pictures\Sample Pictures\Desert_watermark.jpg");
        }

    }

my thanks to Furqan Safdar and Abdias Software The link Problem in tiling image starting at different height using TextureBrush in C# also helped me to solve this problem

and thanks all

finally result

enter image description here

score 8 · Answer 2 · 2012-10-13T06:50:35.620

Your original formula is fine btw.,

are you making sure the resolution of the two are the same? Set DPI resolution of your watermark image equal to image:

watermarkImage.SetResolution(imageGraphics.DpiX, imageGraphics.DpiY);

(from the top of my head, but i think the property names are correct).

UPDATE:

Change from Image to Bitmap in order to use SetResolution() - See if this change works for you - I've changed the way the watermark is drawn onto the image:

private void button1_Click(object sender, EventArgs e) {

    using (Bitmap image = Bitmap.FromFile("C:\Users\Public\Pictures\Sample Pictures\Desert.jpg"))
    using (Bitmap watermarkImage = Bitmap.FromFile("C:\Users\Public\Pictures\Sample Pictures\watermark.png"))
    using (Graphics imageGraphics = Graphics.FromImage(image))
    {
        watermarkImage.SetResolution(imageGraphics.DpiX, imageGraphics.DpiY);

        int x = ((image.Width - watermarkImage.Width) / 2);
        int y = ((image.Height - watermarkImage.Height) / 2);

        imageGraphics.DrawImage(watermarkImage, x, y, watermarkImage.Width, watermarkImage.Height);

        image.Save("C:\Users\Public\Pictures\Sample Pictures\Desert_watermark.jpg");
    }
}

image's resolution is 72dpi and watermarkimage's resolution is 96dpi, i can't find the function specified above, so changed watermarkimage's resolution to 72dpi manually, but no change in result — Riskhan, Oct 13 '12 at 06:20
I have changed your routine a little in the way it draws the waterwark. See if that works. — , Oct 13 '12 at 06:44
Finally i found the solution to solve problem, please see my own answer. many many thanks for you for your support — Riskhan, Oct 13 '12 at 07:09

score 2 · Answer 3 · answered Oct 13 '12 at 05:40

2

Try this code for center alignment:

int x = (image.Width / 2 - watermarkImage.Width / 2);
int y = (image.Height / 2 - watermarkImage.Height / 2);

answered Oct 13 '12 at 05:40

Furqan Safdar

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i implemented your solution, but no change in result, see edited photo – Riskhan Oct 13 '12 at 05:53
By the way it is center aligned but cutting from edges which is mainly due to less size of brush probably. Try increasing the brush size to testing. – Furqan Safdar Oct 13 '12 at 05:55
There is no difference in the calculated result with this compared to original. – Oct 13 '12 at 06:00
@FurqanSafdar Here image size 1024 x 768 and watermark image size 213 x 53 pixels – Riskhan Oct 13 '12 at 06:03

score 1 · Answer 4 · answered Jun 13 '18 at 07:35

Working sample:

public static Bitmap WatermarkImage(Bitmap image, Bitmap watermark)
{
    using (Graphics imageGraphics = Graphics.FromImage(image))
    {
        watermark.SetResolution(imageGraphics.DpiX, imageGraphics.DpiY);

        int x = (image.Width - watermark.Width) / 2;
        int y = (image.Height - watermark.Height) / 2;

        imageGraphics.DrawImage(watermark, x, y, watermark.Width, watermark.Height);
    }

    return image;
}

Usage:

Bitmap watermark = new Bitmap(@"c:/watermark.png");
Bitmap bitmap = new Bitmap(@"c:/image.png");
bitmap = WatermarkImage(bitmap, watermark);
bitmap.Save(@"C:/watermarkedImage.png");

Automatically add watermark to an image

4 Answers4

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