C#使用picutreBox循环显示大尺寸图像时会出现断层,显示不完整

问题遇到的现象和发生背景

C#使用picutreBox循环显示大尺寸图像时会出现断层,显示不完整
最近的一个项目,需要用C#视频抠图,把扣好视频每一帧的图在前端显示,最近增加了更换背景的功能,最初使用picutreBox.BackgroundImage实现,发现如果背景图片过大的话会出现图片断层的现象,然后考虑把背景用单独的控件显示,结果发现picutreBox控件的透明背景其实是把父控件的背景在自己身上重绘出来,相当于盖章,尝试自定义picutreBox控件重写OnPaintBackground方法不执行任何操作

protected override void OnPaintBackground(PaintEventArgs pevent)
{
    //do nothing
}

protected override void OnMove(EventArgs e)
{
    RecreateHandle();
}

// Override the CreateParams property:
protected override CreateParams CreateParams
{
    get
    {
        CreateParams cp = base.CreateParams;
        cp.ExStyle = 0x00000020; //WS_EX_TRANSPARENT
        return cp;
    }
}

结果背景纯黑色
尝试关闭重绘

public Test_PictureBox()
    {
        this.Width = 100;
        this.Height = 100;

        SetTransparenz();
    }

    private void SetTransparenz()
    {
        this.SetStyle(System.Windows.Forms.ControlStyles.Opaque, true);
        this.SetStyle(System.Windows.Forms.ControlStyles.OptimizedDoubleBuffer, false);
        this.SetStyle(System.Windows.Forms.ControlStyles.ResizeRedraw, true);
    }

    protected override System.Windows.Forms.CreateParams CreateParams
    {
        get
        {
            System.Windows.Forms.CreateParams cp = base.CreateParams;
            cp.ExStyle = cp.ExStyle | 0x20;
            // Turn on WS_EX_TRANSPARENTreturn cp;
        }
    }

结果是运行时出现重影

想要有一个方案可以解决这个问题

环境不同，仅供参考【图片太大导致 imageView无法显示】：https://blog.csdn.net/Demon_xiaochunjie/article/details/79424777

picutreBox有image属性，你应该修改它的前景图片而不是背景图片
如果你要重绘，那干脆别用picutreBox，直接在panel里重绘

你从视频抠的图是什么格式的，位图吗，用libjpeg或libpng压缩后再用空间展示出来试试

已解决,经过公司大佬指点
使用Graphics对背景图片进行缩放,把图片分辨率等比例缩小到1080P以下图片大小缩小到一百多Kb左右
附代码

public  string Sized(string imgFile, string SizeImgFile, ImageFormat format)
        {
            string saveimpfile="";
            if (imgFile == "") return saveimpfile;
            Bitmap bitmap = new Bitmap(imgFile);
            
            int Width = bitmap.Width;
            int Height = bitmap.Height; 
            while (Width>2000)
            {
                Width = Width / 2;
                Height = Height / 2;
            }
            Bitmap resizedBmp = new Bitmap(Width, Height);
            Graphics graphics = Graphics.FromImage(resizedBmp);
            graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
            graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;

            graphics.SmoothingMode = SmoothingMode.AntiAlias;

            graphics.DrawImage(bitmap, new Rectangle(0, 0, Width, Height), new Rectangle(0, 0, bitmap.Width, bitmap.Height), GraphicsUnit.Pixel);
            saveimpfile = Path.Combine(SizeImgFile, "123.jpeg");
            Bitmap copybmp = new Bitmap(resizedBmp);
            copybmp.Save(saveimpfile, format);
            graphics.Dispose();
            resizedBmp.Dispose();
            bitmap.Dispose();
            copybmp.Dispose();
            return saveimpfile;
        }