其他地方的图像水印图像（C＃，ASP.Net） [英] Place watermark image on other images (C#, ASP.Net)

问题描述

我如何添加水印图像到其它图像？

我能够把文字图像作为一个水痕上，但现在我有，我想放在那里而不是文字的图像。我该怎么做这在C＃？

只是一个更多的时间是具体的，我有图像的X，我想用它作为水印标志。我想在我的网站上显示时，该符号在我所有的图像出现。因此，我将有图像的X水印图像Y和Z

这里的code我现在有一个创建水印：

 公共静态无效AddWaterMark（MemoryStream的小姐，串watermarkText，MemoryStream的OutputStream中）
        {
            为System.Drawing.Image IMG = System.Drawing.Image.FromStream（毫秒）;
            图形克= Graphics.FromImage（IMG）;
            字体的字体=新的字体（宋体，（浮点）40）;
            色色= Color.FromArgb（50，241，235，105）;
            双切=（双）img.Height /（双）img.Width;
            双角= Math.Atan（切）*（180 / Math.PI）;
            双halfHypotenuse =的Math.sqrt（（img.Height * img.Height）+（img.Width * img.Width））/ 2;
            双正弦，余弦，opp1，ADJ1，opp2，ADJ2;            的for（int i = 100; I＆GT; 0;我 - ）
            {
                字体=新的字体（宋体，我，FontStyle.Bold）;
                的SizeF的SizeF = gr.MeasureString（watermarkText，字体，int.MaxValue）;                罪= Math.Sin（角*（Math.PI / 180））;
                COS = Math.Cos（角*（Math.PI / 180））;
                opp1 =罪* sizef.Width;
                ADJ1 = COS * sizef.Height;
                opp2 =罪* sizef.Height;
                ADJ2 = COS * sizef.Width;                如果（opp1 + ADJ1＆LT; img.Height＆放大器;＆安培; opp2 + ADJ2＆LT; img.Width）
                    打破;
                //
            }            的StringFormat的StringFormat =新的StringFormat（）;
            stringFormat.Alignment = StringAlignment.Center;
            stringFormat.LineAlignment = StringAlignment.Center;            gr.Smoothi​​ngMode = Smoothi​​ngMode.AntiAlias​​;
            gr.RotateTransform（（浮点）角）;
            gr.DrawString（watermarkText，字体，新SolidBrush（颜色），新的点（（int）的halfHypotenuse，0），的StringFormat）;            img.Save（OutputStream的，ImageFormat.Jpeg）;
        }
 

在调用gr.DrawString同一个地方

解决方案

，你也可以做gr.DrawImage（位置，大小，窗格在overlayImage）。它帮助，如果你的图像到覆盖从PNG文件（透明）加载到生产出质量最好的。

How do I add a watermark image onto other images?

I'm able to place text on an image as a water mark but now I have an image that I'd like to put on there instead of the text. How do I do this in C#?

Just one more time to be specific, I have image X and I want to use it as a watermark symbol. I want this symbol to appear on all my image when shown on my website. So I will have image X watermarked on image Y and Z.

Here's the code I currently have that creates the watermark:

public static void AddWaterMark(MemoryStream ms, string watermarkText, MemoryStream outputStream)
        {
            System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
            Graphics gr = Graphics.FromImage(img);
            Font font = new Font("Tahoma", (float)40);
            Color color = Color.FromArgb(50, 241, 235, 105);
            double tangent = (double)img.Height / (double)img.Width;
            double angle = Math.Atan(tangent) * (180 / Math.PI);
            double halfHypotenuse = Math.Sqrt((img.Height * img.Height) + (img.Width * img.Width)) / 2;
            double sin, cos, opp1, adj1, opp2, adj2;

            for (int i = 100; i > 0; i--)
            {
                font = new Font("Tahoma", i, FontStyle.Bold);
                SizeF sizef = gr.MeasureString(watermarkText, font, int.MaxValue);

                sin = Math.Sin(angle * (Math.PI / 180));
                cos = Math.Cos(angle * (Math.PI / 180));
                opp1 = sin * sizef.Width;
                adj1 = cos * sizef.Height;
                opp2 = sin * sizef.Height;
                adj2 = cos * sizef.Width;

                if (opp1 + adj1 < img.Height && opp2 + adj2 < img.Width)
                    break;
                //
            }

            StringFormat stringFormat = new StringFormat();
            stringFormat.Alignment = StringAlignment.Center;
            stringFormat.LineAlignment = StringAlignment.Center;

            gr.SmoothingMode = SmoothingMode.AntiAlias;
            gr.RotateTransform((float)angle);
            gr.DrawString(watermarkText, font, new SolidBrush(color), new Point((int)halfHypotenuse, 0), stringFormat);

            img.Save(outputStream, ImageFormat.Jpeg);
        }

解决方案

in the same place where you call gr.DrawString, you can also do gr.DrawImage(position, size, overlayImage). It helps if your image-to-overlay is loaded from a PNG file (with transparency) to produce the best quality.

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