c# 如何将 ushort 值转换为字节，以便我可以在图片框中显示它们

Question

    public void accessHi3DRange(buffer)
    {
        double meanR = 0;
        uint sumR = 0;
        uint countR = 0;
        int numberOfScansR = buffer.Height;
        bitmapHeight = numberOfScansR;

        int subCompWidth = buffer.Components["Hi3D 1"].SubComponents["Range"].Format.Width;
        bitmapWidth = subCompWidth;
        ushort[,] data = buffer.Components["Hi3D 1"].SubComponents["Range"].GetRows<ushort>(0, numberOfScansR);

        for (int scan = 0; scan < numberOfScansR; scan++)
        {

            for (int col = 0; col < subCompWidth; col++)
            {
                ushort val = data[scan, col];
                if (val != 0)
                {
                    sumR += val;
                    drawPix(col, scan, (int)val, (int)val, (int)val);
                    countR++;
                }
            }
        }
    }

    private void drawPix(int x, int y, int r, int g, int b)
    {
        ((Bitmap)pictureBox1.Image).SetPixel(x, y, Color.FromArgb(r, g, b));
        return;
    }

当我运行我得到的代码时

System.ArgumentException: 'Value of '655' is not valid for 'red'. 'red' should be greater than or equal to 0 and less than or equal to 255.'

所以为了解决这个错误，我想把ushort值转换成byte，这样它就可以在图片框中显示了。如果是这样，我该如何转换？

Answer 1

我认为问题出在这里：

drawPix(col, scan, (int)val, (int)val, (int)val);

因为您将这些大 int 传递给 Color.FromArgb(r, g, b) 函数。 MSDN 在这里说 https://msdn.microsoft.com/en-us/library/cce5h557(v=vs.110).aspx R、G 和 B 的值必须是 0 到 255。

我想你想要的是这个重载：https://msdn.microsoft.com/en-us/library/2zys7833(v=vs.110).aspx 获取完整的 int 然后将其从那里分解为 a、r、g 和 b。

这需要对您的代码进行以下编辑：

 public void accessHi3DRange(buffer)
    {
        double meanR = 0;
        uint sumR = 0;
        uint countR = 0;
        int numberOfScansR = buffer.Height;
        bitmapHeight = numberOfScansR;

        int subCompWidth = buffer.Components["Hi3D 1"].SubComponents["Range"].Format.Width;
        bitmapWidth = subCompWidth;
        ushort[,] data = buffer.Components["Hi3D 1"].SubComponents["Range"].GetRows<ushort>(0, numberOfScansR);

        for (int scan = 0; scan < numberOfScansR; scan++)
        {

            for (int col = 0; col < subCompWidth; col++)
            {
                ushort val = data[scan, col];
                if (val != 0)
                {
                    sumR += val;
                    drawPix(col, scan, (int)val);
                    countR++;
                }
            }
        }
    }

    private void drawPix(int x, int y, int rgb)
    {
        ((Bitmap)pictureBox1.Image).SetPixel(x, y, Color.FromArgb(rgb));
        return;
    }

c# 如何将 ushort 值转换为字节，以便我可以在图片框中显示它们

c# How to convert ushort value into byte so that I can display them in picturebox

c#

byte

image

image-processing

ushort