c#- Drawing rectangle on a Tiff image bloats the file

Hi I am trying to add a small rectanlge graphics on a exiting Tiff file using C# and sav it back as a new tiff file. But the image sevelry bloats from 118kb to 954 kb just for adding a small rectangle. My original image doesn't have any color except black and white(may be greyscale). The rectangle box that I am drawing uses black color.
Please help in fixing this issue.

imgPath = "D:\\sample.tiff";
            newImgPath = "D:\\samplenew.tiff";
            Bitmap org = (Bitmap)Image.FromFile(imgPath);
            Bitmap bm = new Bitmap(org.Width, org.Height);
            Graphics g = Graphics.FromImage(bm);
            g.DrawImage(org, 0, 0, org.Width, org.Height);
            g.FillRectangle(Brushes.Black, 5, 5, 100, 30);
            g.DrawRectangle(Pens.Black, 5, 5, 100, 30);
            g.Dispose();
            bm.Save(newImgPath, System.Drawing.Imaging.ImageFormat.Tiff);
            bm.Dispose();

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Last Comment

hasan_tek

8/22/2022 - Mon

Mike Tomlinson

2/27/2009

Try...

            imgPath = "D:\\sample.tiff";
            newImgPath = "D:\\samplenew.tiff";
 
            System.IO.FileStream fs = new System.IO.FileStream(imgPath, System.IO.FileMode.Open);
            Image img = Image.FromStream(fs);
            fs.Close();
 
            Graphics g = Graphics.FromImage(img);
            g.FillRectangle(Brushes.Black, 5, 5, 100, 30);
            g.DrawRectangle(Pens.Black, 5, 5, 100, 30);
            g.Dispose();
 
            img.Save(newImgPath, System.Drawing.Imaging.ImageFormat.Tiff);

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hasan_tek

2/27/2009

ASKER

Thanks for responding.
Getting Error:
A Graphics object cannot be created from an image that has an indexed pixel format.
at the line
Graphics g = Graphics.FromImage(img);
Any suggestions?

hasan_tek

2/27/2009

ASKER

I tried your approach before and got the error and somebody suggested the alternate way of creating a bitmap(my original code) but that bloats the resulting tiff...

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Mike Tomlinson

2/27/2009

Hmm....sorry. I did a quick test with a tiff but i guess it wasn't "indexed". =\

Mike Tomlinson

2/27/2009

I'm not really good with all the different image formats...perhaps you need to specify the format when creating "bm" using this constructor?
(with your original code that is)
http://msdn.microsoft.com/en-us/library/3z132tat.aspx
http://msdn.microsoft.com/en-us/library/system.drawing.imaging.pixelformat.aspx

hasan_tek

2/27/2009

ASKER

I tried changing it as

Bitmap bm = new Bitmap(org.Width, org.Height,org.PixelFormat);
but its giving the same error :
A Graphics object cannot be created from an image that has an indexed pixel format.

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hasan_tek

2/27/2009

ASKER

I even tried adding encoder.compression for the bitmap as per: http://msdn.microsoft.com/en-us/library/system.drawing.imaging.encoder.compression.aspx
That doesn't help a lot. It creates a tiff of 954 kb size from a 118kb original tiff files. Please help.

ASKER CERTIFIED SOLUTION

hasan_tek

3/4/2009

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