如何将RGB图像更改为HSI [英] How to change RGB Image to HSI

问题描述

我遇到了问题，需要您的代码帮助。我需要将RGB图像更改为HSI图像：



错误：值太大而且太小而不是Int32？



请帮帮我，谢谢大家！



我的代码如下：

I have a problem, and need your kind help for my code. I need to change RGB Image to HSI Image:

Error: Value either too large and too small then Int32?

please help me ,thanks all!

My code is as:

private void rGBToHSIToolStripMenuItem_Click(object sender, EventArgs e) { 
        Bitmap org = (Bitmap)pictureBox1.Image.Clone(); //ghi anh da open gan vao bien org, ghi vao bo nho

        Bitmap output1 = new Bitmap(org.Width, org.Height);
        //dua ra anh ouput voi kich thuoc tuong tu anh da nhap la org

        for (Byte y = 0; y < output1.Height; y++)
        //thuc hien lap cho y chay tu o den chieu cao anh
        {
            for (Byte x = 0; x < output1.Width; x++)
            //thuc hien lap cho x chay tu 0 den chieu rong
            {
                Color c = org.GetPixel(x, y);
                Double h=0;

                Byte r = Convert.ToByte(c.R/(c.R + c.G + c.B));
                Byte g = Convert.ToByte(c.G / (c.R + c.G + c.B));
                Byte b = Convert.ToByte(c.B / (c.R + c.G + c.B));

                Byte s = Convert.ToByte(1 - 3 * Math.Min(r, Math.Min(g, b)));
                Byte k = Convert.ToByte((c.R + c.G + c.B) / (3 * 255));
                if (b<=g)
                {
                  h = Convert.ToDouble((Math.Round((1 / Math.Cos((0.5 * (2 * r - g - b)) / (Math.Sqrt(((r - g) * (r - g) + (r - b) * (g - b)))))))));
                }
                else
                {
                    h = Convert.ToDouble((Math.Round((2 * 3.14 - 1 / Math.Cos((0.5 * (2 * r - g - b)) / (Math.Sqrt(((r - g) * (r - g) + (r - b) * (g - b)))))))));
                }

                Byte s1 = Convert.ToByte((s * 100));
                Byte k1 = Convert.ToByte((k * 255));
                 Byte h1 = Convert.ToByte(((h * 180 / 3.14)));

                output1.SetPixel(x, y, Color.FromArgb(h1, s1, k1));

            }

推荐答案

对于这种类型的图像处理，你真的应该使用不安全的代码（指针） ）在你的嵌套循环中。在此搜索页面上查看有关CodeProject的三篇文章：[ ^ ]。



您可以在这里尝试RGB< => HSL算法：[ ^ ]。



您还可以使用API​​调用：

For image processing of this type you really should be using "unsafe" code (pointers) in your nested loop. See the three articles on CodeProject on this search page: [^].

You might try the RGB<=>HSL algorithm here: [^].

There is an API call you can use also:

[DllImport("shlwapi.dll")]
static extern void ColorRGBToHLS(int RGB, ref int H, ref int L, ref int S);

但是，请参阅此处的示例代码对其输出的重要修改：[ ^ ]。



您是否知道.NET提供RGB到HSL转换功能？示例：

But, see the sample code here for an important modification of its output:[^].

Are you aware that .NET supplies RGB to HSL conversion functions ? Example:

private struct hslColorValues
{
    private float H;
    private float S;
    private float B;

    public hslColorValues(float hue, float saturation, float brightness)
    {
        H = hue;
        S = saturation;
        B = brightness;
    }
}

private hslColorValues rgbToHsl(string colorName)
{
    Color color = Color.FromName(colorName);
    return new hslColorValues(color.GetHue(), color.GetSaturation(), color.GetBrightness());
}

这篇关于如何将RGB图像更改为HSI的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！