如何将'System.Drawing.Image'转换为'System.Drawing.Bitmap'？ [英] How to Convert 'System.Drawing.Image' to 'System.Drawing.Bitmap'?

问题描述

我有一个问题：

无法将类型'System.Drawing.Image'隐式转换为'System.Drawing.Bitmap'。存在显式转换（您是否错过了演员？）



在线：位图imagestream = GrayScale（Img）;

Hi, i have a problem regarding:
Cannot implicitly convert type 'System.Drawing.Image' to 'System.Drawing.Bitmap'. An explicit conversion exists (are you missing a cast?)

On the line : Bitmap imagestream = GrayScale(Img);

public Image GrayScale(Image Img)
{
    Stream imageStream = new MemoryStream();
    using (Bitmap bmp = new Bitmap(Img))
    {
        int rgb;
        Color c;

        for (int y = 0; y < bmp.Height; y++)
            for (int x = 0; x < bmp.Width; x++)
            {
                c = bmp.GetPixel(x, y);
                rgb = (int)((c.R + c.G + c.B) / 3);
                bmp.SetPixel(x, y, Color.FromArgb(rgb, rgb, rgb));
            }
        bmp.Save(imageStream, ImageFormat.Jpeg);
    }
    return Image.FromStream(imageStream);
}

private void button2_Click(object sender, EventArgs e)
{
    Image Img = Image.FromFile("C:\\Users\\L31101\\Desktop\\19.male.happy.normalized.jpg");

    Bitmap imagestream = GrayScale(Img);
}

任何人都知道如何解决这个问题？

Anyone knows how to solve this?

推荐答案

试试这个：

Try this:

Bitmap imagestream = new Bitmap(GrayScale(Img));

你好



尝试下面的一个



位图oBitmap =新位图（GrayScale（Img））;







位图oBitmap =（位图）GrayScale（Img）;









图像oImage = GrayScale（Img）;



位图oBitmap = oImage作为位图;

Hello

Try one one of the below

Bitmap oBitmap = new Bitmap(GrayScale(Img));

OR

Bitmap oBitmap = (Bitmap) GrayScale(Img);


OR

Image oImage = GrayScale(Img);

Bitmap oBitmap = oImage as Bitmap;

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