Graphics.DrawString指定文本的不透明度

using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;

public static Image DrawTextWithOpacity(string text, Font font, Color color, float x, float y, float opacity)
{
    // 创建一个空白图像，用于绘制文本
    Image image = new Bitmap(1, 1, PixelFormat.Format32bppArgb);
    Graphics graphics = Graphics.FromImage(image);

    // 设置文本的颜色和不透明度
    color = Color.FromArgb(opacity * 255, color);

    // 绘制文本
    graphics.DrawString(text, font, new SolidBrush(color), x, y);

    // 将文本图像转换为位图格式
    Bitmap bitmap = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppArgb);
    bitmap.SetResolution(graphics.DpiX, graphics.DpiY);
    graphics.Dispose();
    graphics = Graphics.FromImage(bitmap);
    graphics.CompositingMode = CompositingMode.SourceOver;
    graphics.CompositingQuality = CompositingQuality.HighQuality;
    graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
    graphics.SmoothingMode = SmoothingMode.HighQuality;
    graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
    graphics.DrawImage(image, 0, 0);
    graphics.Dispose();

    // 返回文本图像
    return bitmap;
}