英文:
How do I add a watermark to multiple images using bitmap
问题
我正在尝试将文本水印添加到从目录中加载的多个图像，并将其保存到另一个目录。以下是我目前的代码：
using System.Web.Mvc;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
namespace something.Controllers
{
public class something : Controller
{
public ActionResult Index()
{
return View();
}
[HttpPost]
public ActionResult Index(string text, string text1)
{
DirectoryInfo dir = new DirectoryInfo(@"C:\Users\name\Desktop\Images");
FileInfo[] files = dir.GetFiles();
string value = text;
string value1 = text1;
foreach (FileInfo file in files)
{
using (Bitmap bitmap = new Bitmap(file.FullName))
{
using (Graphics graphics = Graphics.FromImage(bitmap))
{
Brush brush = new SolidBrush(Color.Red);
Font font = new Font("Arial", 10, FontStyle.Italic, GraphicsUnit.Pixel);
SizeF textSize = new SizeF();
textSize = graphics.MeasureString(value, font);
Point position = new Point(bitmap.Width - ((int)textSize.Width + 30), bitmap.Height - ((int)textSize.Height + 10));
graphics.DrawString((value + value1), font, brush, position);
using (MemoryStream mStream = new MemoryStream())
{
mStream.Position = 0;
bitmap.Save(mStream, ImageFormat.Png);
string _path = Path.Combine(Server.MapPath("~/UploadedFolders"), file.Name);
bitmap.Save(_path);
}
}
}
}
return View();
}
}
}
这段代码接受用户输入并将其附加到图像，这部分正常工作。
问题是：使用这段代码，它只会对文件夹中的第一个图像添加水印并保存。而不是对所有图像添加水印。
谢谢！
英文:
I am trying to add text watermark to multiple images from a directory and save it to a directory. Here is what I have so far:
using System.Web.Mvc;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
namespace something.Controllers
{
public class something: Controller
{
public ActionResult Index()
{
return View();
}
[HttpPost]
public ActionResult Index(string text, string text1)
{
DirectoryInfo dir = new DirectoryInfo(@"C:\Users\name\Desktop\Images");
FileInfo[] files = dir.GetFiles();
string value = text;
string value1 = text1;
foreach (FileInfo file in files)
{
using (Bitmap bitmap = new Bitmap( file.FullName))
{
using (Graphics graphics = Graphics.FromImage(bitmap))
{
Brush brush = new SolidBrush(Color.Red);
Font font = new Font("Arial", 10, FontStyle.Italic,
GraphicsUnit.Pixel);
SizeF textSize = new SizeF();
textSize = graphics.MeasureString(value, font);
Point position = new Point(bitmap.Width - ((int)textSize.Width +
30), bitmap.Height - ((int)textSize.Height + 10));
graphics.DrawString((value + value1), font, brush, position);
using (MemoryStream mStream = new MemoryStream())
{
mStream.Position = 0;
bitmap.Save(mStream, ImageFormat.Png);
string _path =
Path.Combine(Server.MapPath("~/UploadedFolders"),
file.Name);
bitmap.Save(_path);
return File(mStream.ToArray(), "image/png", file.Name);
}
}
}
}
return View();
}
}
}
This code take user input and append it to the image this part works fine.
The issue:
With this code it goes to the path and only add a water mark to the first image in the folder and save it. Not all images.
Thank you
答案1
得分: 1
以下代码可行：
public void watermarkImage(string sourceImage, string text, string targetImage, ImageFormat fmt) {
try
{
// 打开源图像为流并创建输出的内存流
FileStream source = new FileStream(sourceImage, FileMode.Open);
Stream output = new MemoryStream();
Image img = Image.FromStream(source);
// 选择文本字体
Font font = new Font("Arial", 20, FontStyle.Bold, GraphicsUnit.Pixel);
// 选择颜色和透明度
Color color = Color.FromArgb(100, 255, 0, 0);
// 水印文本在父图像中的位置
Point pt = new Point(10, 5);
SolidBrush brush = new SolidBrush(color);
// 在图像上绘制文本
Graphics graphics = Graphics.FromImage(img);
graphics.DrawString(text, font, brush, pt);
graphics.Dispose();
// 更新图像内存流
img.Save(output, fmt);
Image imgFinal = Image.FromStream(output);
// 将修改后的图像写入文件
Bitmap bmp = new System.Drawing.Bitmap(img.Width, img.Height, img.PixelFormat);
Graphics graphics2 = Graphics.FromImage(bmp);
graphics2.DrawImage(imgFinal, new Point(0, 0));
bmp.Save(targetImage, fmt);
imgFinal.Dispose();
img.Dispose();
}
catch (Exception ex) {
MessageBox.Show(ex.Message);
}
}
英文:
Below Code works :
public void watermarkImage(string sourceImage, string text, string targetImage, ImageFormat fmt) {
try
{
// open source image as stream and create a memorystream for output
FileStream source = new FileStream(sourceImage, FileMode.Open);
Stream output = new MemoryStream();
Image img = Image.FromStream(source);
// choose font for text
Font font = new Font("Arial", 20, FontStyle.Bold, GraphicsUnit.Pixel);
//choose color and transparency
Color color = Color.FromArgb(100, 255, 0, 0);
//location of the watermark text in the parent image
Point pt = new Point(10, 5);
SolidBrush brush = new SolidBrush(color);
//draw text on image
Graphics graphics = Graphics.FromImage(img);
graphics.DrawString(text, font, brush, pt);
graphics.Dispose();
//update image memorystream
img.Save(output, fmt);
Image imgFinal = Image.FromStream(output);
//write modified image to file
Bitmap bmp = new System.Drawing.Bitmap(img.Width, img.Height, img.PixelFormat);
Graphics graphics2 = Graphics.FromImage(bmp);
graphics2.DrawImage(imgFinal, new Point(0, 0));
bmp.Save(targetImage, fmt);
imgFinal.Dispose();
img.Dispose();
}
catch (Exception ex) {
MessageBox.Show(ex.Message);
}
}
答案2
得分: 0
只需要移除这一行：
return File(mStream.ToArray(), "image/png", file.Name);
代码运行良好，如果有人需要，这是另一个参考。
英文:
simply needed to remove this line:
return File(mStream.ToArray(), "image/png", file.Name);
Code works good and is another reference if someone needs it.
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