如何从图像中的特定颜色中查找像素数？

Question

所以我正在尝试制作一个程序,可以找到它中有多少像素的特定颜色.图像是用相机拍摄的照片,之后在photoshop上标记了一些区域,我需要找到这些像素的确切数量.但我几乎没有问题.我正在使用getPixel(x,y),但我正在与我想要的Color.FromArgb(红色,绿色,蓝色)进行比较但是......我的第一个问题是颜色有点不同,例如我想要找出RGB 116,110,40的颜色但是当你在photoshop上用这种颜色绘制时,一些像素会得到一些不同的颜色,比如RGB 115,108,38(以及其他相似的颜色),我也想包括它.所以我终于提出了这个代码(但似乎id现在正常工作):

public Form1()
    {
        InitializeComponent();
    }

    Bitmap image1;
    int count=0;
    int red, green, blue;
    int redt, greent, bluet;
    double reshenie;

    private void button1_Click(object sender, EventArgs e)
    {
        try
        {
            red = int.Parse(textBox1.Text);
            green = int.Parse(textBox2.Text);
            blue = int.Parse(textBox3.Text);

                           // Retrieve the image.
            image1 = new Bitmap(@"C:\bg-img.jpg", true);
             double widht, height, pixel ;
            int x, y;
            MessageBox.Show(pixel.ToString());

            // Loop through the images pixels            
            for (x = 0; x < image1.Width; x++)
            {
                for (y = 0; y < image1.Height; y++)
                {
                    Color pixelColor = image1.GetPixel(x, y);
                    redt = pixelColor.R;
                    greent = pixelColor.G;
                    bluet = pixelColor.B;


                    if ((red+10>=redt) && (red-10>=redt))//i used +-10 in attempt to resolve the problem that i have writed about the close colours
                    {

                        if ((green + 10 >= greent) && (green - 10 >= greent))
                        {
                            if ((blue + 10 >= bluet) && (blue - 10 >= bluet))
                            {
                                count += 1;

                            }
                        }
                    }
                }
            }

            pictureBox1.Image = image1;

            MessageBox.Show("Imashe " + count.ToString());
            count = 0;

        }
        catch (ArgumentException)
        {
            MessageBox.Show("There was an error." +
                "Check the path to the image file.");

        }

    }

问题是我没有得到我期望的结果.例如,当我必须得到像1000像素我或多或少,我无法找到我的错误.所以如果有人能让我知道我做错了什么.在此先感谢您的所有帮助.

Answer 1

请尝试使用此循环:

int epsilon = 10;

for (x = 0; x < image1.Width; ++x)
{
    for (y = 0; y < image1.Height; ++y)
    {
        Color pixelColor = image1.GetPixel(x, y);
        redt = pixelColor.R;
        greent = pixelColor.G;
        bluet = pixelColor.B;

        if (Math.Abs(redt   - red)   <= epsilon &&
            Math.Abs(greent - green) <= epsilon &&
            Math.Abs(bluet  - blue)  <= epsilon)
        {
            ++ count;
        }
    }
}

epsilon每个通道的像素颜色和目标颜色之间的最大差异在哪里.