在C中合并JPG和GDI#

GalacticCowboy

using (Bitmap background = (Bitmap)Bitmap.FromFile(backgroundPath))
{
     using (Bitmap foreground = (Bitmap)Bitmap.FromFile(foregroundPath))
     {
          // check if heights and widths are the same
          if (background.Height == foreground.Height & background.Width == foreground.Width)
          {
               using (Bitmap mergedImage = new Bitmap(background.Width, background.Height))
               {
                    for (int x = 0; x < mergedImage.Width; x++)
                    {
                         for (int y = 0; y < mergedImage.Height; y++)
                         {
                              Color backgroundPixel = background.GetPixel(x, y);
                              Color foregroundPixel = foreground.GetPixel(x, y);
                              Color mergedPixel = Color.FromArgb(backgroundPixel.ToArgb() & foregroundPixel.ToArgb());
                              mergedImage.SetPixel(x, y, mergedPixel);
                          }
                    }
                    mergedImage.Save("filepath");
               }

          }
     }
}

如果图像大小相同,则迭代它们并“与”每个像素的颜色。对于白色像素,您应该得到其他图像的颜色,对于黑色像素,您应得到黑色。

如果它们的大小不同,请先按比例缩放。

我是凭空想象出来的,但大致如下:

Color destColor = Color.FromArgb(pixel1.ToArgb() & pixel2.ToArgb());

Image BackImage = Image.FromFile(backgroundPath);
using (Graphics g = Graphics.FromImage(BackImage))
{
    using (ForeImage = Image.FromFile(foregroundPath))
    {   
        ImageAttributes imageAttr = new ImageAttributes();
        imageAttr.SetColorKey(Color.FromArgb(245, 245, 245), Color.FromArgb(255, 255, 255),
            ColorAdjustType.Default);
        g.DrawImage(ForeImage, new Rectangle(0, 0, BackImage.Width, BackImage.Height),
            0, 0, BackImage.Width, BackImage.Height, GraphicsUnit.Pixel, imageAttr);
    }
}

SetColorKey方法将使指定范围内的颜色透明,因此您可以使白色位图像素透明,包括所有受jpeg压缩伪影影响的像素。