watermark .gif and .tif images

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Hi..

I'm watermarking images using C# with a .png image.
all the .jpg, .bmp, .png images are getting watermarked perfectly but when watermarking .tif
and .gif images error occurs.

error message : "A Graphics object cannot be created from an image that has an indexed pixel format."

for images other than .tif and .gif

C#

FileStream fs = new FileStream(img, FileMode.Open, FileAccess.Read);
                        image = Image.FromStream(fs);
Graphics imageGraphics = Graphics.FromImage(image);
            watermarkBrush.TranslateTransform(x, y);
            imageGraphics.FillRectangle(watermarkBrush, new Rectangle(new Point(x, y), new Size(finalWaterImage.Width + 1,finalWaterImage.Height)));

            var filename = Path.GetFileName(img);
            image.Save(outputFolder + "\\" + filename);

for .gif i did this code and it worked :

C#

<pre lang="c#">FileStream fs = new FileStream(CurrentFile, FileMode.Open, FileAccess.Read);
            image = Image.FromStream(fs);

            Bitmap bit = new Bitmap(image.Width, image.Height);
            Graphics newGraphics = Graphics.FromImage((Image)bit);

            newGraphics.DrawImage(image, 0, 0, image.Width, image.Height);
            image = bit;
 Graphics imageGraphics = Graphics.FromImage(image);
            watermarkBrush.TranslateTransform(x, y);
            imageGraphics.FillRectangle(watermarkBrush, new Rectangle(new Point(x, y), new Size(finalWaterImage.Width + 1,finalWaterImage.Height)));

but this aint working for .tif

the above error occured for .gif images.
now that .if images are working, after passing .tif image i get an error saying "parameter not valid at this line :

C#

image = Image.FromStream(fs);

"

Posted 5-May-13 20:35pm

riangel

Updated 6-May-13 19:34pm

v3

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Comments

Sergey Alexandrovich Kryukov 6-May-13 2:52am

This error message is unrelated to the question asked in the title of this post.
If you need any help, you would need to produce some code sample and steps to reproduce the problem. Your problem is in the source file, its pixel format; you should use another one.
—SA

Orcun Iyigun 6-May-13 2:53am

Can you please post some code? Are you using Image ?

riangel 6-May-13 3:15am

oh im sorry !! i'll post my code.. asked question for the first time !! :)

2 solutions

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Accepted Answer · 2013-05-05T20:58:00

Solution 1

Please see my comment to the question. You cannot ask questions this way.

However, I think I know how to solve the problem. My guess is: your exception is thrown in this call:
http://msdn.microsoft.com/en-us/library/system.drawing.graphics.fromimage.aspx[^].

If works for most images, but you happen to come across the image with indexed format, which is not supported (which is quite natural). You were very lucky to catch this case before one of your users did. You should not use it.

How to fix the situation? Before doing this call, you simply need to convert the bitmap to some unified pixel format which is supported by Graphics. The simplest way to do it would be System.Drawing.Bitmap.Clone:
http://msdn.microsoft.com/en-us/library/ms141944.aspx[^],
http://msdn.microsoft.com/en-us/library/ezs7679t.aspx[^].

This should solve your problem. If not, please don't blame me. You should have provided a code sample and a way to reproduce the problem.

—SA

Posted 5-May-13 20:58pm

Sergey Alexandrovich Kryukov

Comments

riangel 6-May-13 3:51am

@Sergey Alexandrovich Kryukov i cannot put a restriction on image uploads.
i did it for .gif, now .tif are not working

Sergey Alexandrovich Kryukov 6-May-13 10:29am

The problem is not directly related with the file type, it is related to pixel format. Did you managed to load a TIFF file at all?
—SA

riangel 7-May-13 0:48am

@Sergey Alexandrovich Kryukov no.. .tif image is not getting loaded.
it gives error at the filestream itself saying invalid parameter.

Sergey Alexandrovich Kryukov 7-May-13 1:24am

Then how could you come to your problem? In your question, you reported a different problem. I see a contradiction in your observations as you explained them.
OK, I know what's the problems: please indicate exactly, where the exception was thrown, in what line of your code, to start with.
—SA

riangel 7-May-13 1:35am

its confusing !!
i'l update my question... :(

Sergey Alexandrovich Kryukov 7-May-13 1:53am

So, TIF is not loaded at all, and GIF is loaded, but then you got ""A Graphics object cannot be created from an image that has an indexed pixel format." (and my answer completely covers the second problem). Why are you showing to code samples? This is really confusing. If you use one for some files and another for different files, why?

Now, the problem with TIFF. Look at the very fist line. What's "img"? You code should be as in the second code sample. Anyway, what's that mess? Your problem is very simple, but only if all input files are valid. If some use wrong pixel type, I explained the work around. Just do it all accurately, in one common code, and you will get all you want...

—SA

riangel 7-May-13 2:27am

i know its confusing !! im all confused myself.. so i decided to exclude .tif images for now..
thank u so much for ur patience.. :) :) :)

Sergey Alexandrovich Kryukov 7-May-13 2:35am

You are very welcome.
Good luck, call again.
—SA

**Orcun Iyigun** · Accepted Answer · 2013-05-05T21:04:00

Since GDI+ graphics object doesn't support indexed images. I assume you were using Image in your code so that you end up getting that exception. To overcome it you should convert your Image to Bitmap.

C#

try
{
    Image img = Image.FromStream(new MemoryStream(image));
    // OR from file I dont know how you load it
    Bitmap img = new Bitmap(new Bitmap( img ));
    //do your image processing
}
catch (Exception ex)
{
  // do stuff
}

Good luck,
OI

watermark .gif and .tif images

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watermark .gif and .tif images

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