/// <summary> /// Draw image watermark. /// <para>Notice regarding watermark opacity:</para> /// <para>If watermark image needs to be resized, first resize the watermark image, /// then save it to the disc, and read it again with Image.FromFile.</para> /// </summary> /// <param name="img">The original image</param> /// <param name="wmImage">Watermak image</param> /// <param name="ops">Image watermark options <see cref="ImageWatermarkOptions"/></param> public static Image AddImageWatermark(this Image img, Image wmImage, ImageWatermarkOptions ops) { if (ops.Opacity > 0) { using (var graphics = Graphics.FromImage(img)) { graphics.SmoothingMode = SmoothingMode.None; graphics.CompositingMode = CompositingMode.SourceOver; if (ops.Opacity < 100) { wmImage = ImageOpacity.ChangeImageOpacityMethod1(wmImage, ops.Opacity); } var wmW = wmImage.Width; var wmH = wmImage.Height; var drawingPoint = ImageWatermarkPosition.ImageWatermarkPos(img.Width, img.Height, wmW, wmH, ops.Location, ops.Margin); graphics.DrawImage(wmImage, drawingPoint.X, drawingPoint.Y, wmW, wmH); } } wmImage.Dispose(); return(img); }
/// <summary> /// Draw image watermark /// </summary> /// <param name="img">The original image</param> /// <param name="wmImgPath">Path to the watermark image file e.g. wwwroot\images\watermark.png</param> /// <param name="ops">Image watermark options <see cref="ImageWatermarkOptions"/></param> public static Image AddImageWatermark(this Image img, string wmImgPath, ImageWatermarkOptions ops) { var wm = Image.FromFile(wmImgPath); return(img.AddImageWatermark(wm, ops)); }