watermark - C# watermarking not working for .gif and .tif images -


i'm trying watermark images .png image .jpg , .png images getting watermarked .tif , .gif images give error.

i'm doing in c#. , errror :

{"a graphics object cannot created image has indexed pixel format. @ system.drawing.graphics.fromimage(image image) @ watermarking.test_image_watermak.button1_click(object sender, eventargs e) "}

my code

filestream fs = new filestream(img, filemode.open, fileaccess.read);                     image = image.fromstream(fs);                      int newwaterwidth = (int)((float)image.width * .30);                       int newwaterheight = (newwaterwidth * watermarkimage.height) / watermarkimage.width;                      bitmap resizedwaterm = new bitmap(newwaterwidth, newwaterheight);                     graphics g = graphics.fromimage((image)resizedwaterm);                      g.drawimage(watermarkimage, 0, 0, newwaterwidth, newwaterheight);                      ***graphics imagegraphics = graphics.fromimage(image);*** //error @ line                      texturebrush watermarkbrush = new texturebrush((image)resizedwaterm);                     int x = (image.width / 2 - resizedwaterm.width / 2);                      int y = (image.height / 2 - resizedwaterm.height / 2);                      watermarkbrush.translatetransform(x, y);                      imagegraphics.fillrectangle(watermarkbrush, new rectangle(new point(x, y), new size(resizedwaterm.width + 1, resizedwaterm.height)));                     var filename = path.getfilename(img);                      image.save(outputfolder + "\\" + filename);

is there different need these types of images ???

"a graphics object cannot created image has indexed pixel format." tells itself. gif images palette-based, tiff image seems indexed (while there full-color tiffs).


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