c# - 如何从图像中获取前 5 种最常用的 RGB 颜色？

Question

我需要一个指导来执行此操作。我遍历所有像素并通过 GetPixel() 方法获取值。接下来我该做什么？

Answer 1

这是获取所有像素的辅助方法:

public static IEnumerable<Color> GetPixels(Bitmap bitmap)
{
    for (int x = 0; x < bitmap.Width; x++)
    {
        for (int y = 0; y < bitmap.Height; y++)
        {
            Color pixel = bitmap.GetPixel(x, y);
            yield return pixel;
        }
    }
}

如果您只需要颜色(没有计数器):

using (var bitmap = new Bitmap(@"..."))
{
    var mostUsedColors =
        GetPixels(bitmap)
            .GroupBy(color => color)
            .OrderByDescending(grp => grp.Count())
            .Select(grp => grp.Key)
            .Take(5);
    foreach (var color in mostUsedColors)
    {
        Console.WriteLine("Color {0}", color);
    }
}

顺便说一下，这里是用计数器选择的前 5 种最常用的颜色:

using (var bitmap = new Bitmap(@"..."))
{
    var colorsWithCount =
        GetPixels(bitmap)
            .GroupBy(color => color)
            .Select(grp =>
                new
                    {
                        Color = grp.Key,
                        Count = grp.Count()
                    })
            .OrderByDescending(x => x.Count)
            .Take(5);

    foreach (var colorWithCount in colorsWithCount)
    {
        Console.WriteLine("Color {0}, count: {1}",
            colorWithCount.Color, colorWithCount.Count);
    }
}