Code to get the most used color in the middle 100x100 area of an image

most_seen_color.cs

using System;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
using System.Collections.Generic;
namespace picture_perfet
{
    class Program
    {
        static void Main(string[] args)
        {
            Image<Rgba32> img = Image.Load(Console.ReadLine()).CloneAs<Rgba32>();
            if (img.Width > 100 && img.Height > 100)
                img.Mutate(x => x.Crop(new Rectangle((img.Width / 2) - 100, (img.Height / 2) - 100, 100, 100)));
            Console.WriteLine(img.Size());


            // we dont need to go trough the full image as it **should** be 100x100 anyway
            IDictionary<string, int> colors = new Dictionary<string, int>();
            for (int y = 0; y < 100; y++)
            {
                Span<Rgba32> row = img.GetPixelRowSpan(y);
                for (int x = 0; x < 100; x++)
                {
                    Rgba32 pixel = row[x];
                    string hex_clr = pixel.ToHex();
                    if (!colors.TryAdd(hex_clr, 1))
                    {
                        int amount;
                        colors.TryGetValue(hex_clr, out amount);
                        colors[hex_clr] = amount;
                    }
                }
            }

            KeyValuePair<string, int> most = new KeyValuePair<string, int>("", 0);
            foreach (KeyValuePair<string, int> color in colors)
            {
                int amount = color.Value;
                if (amount > most.Value)
                {
                    most = color;
                }
            }

            Console.WriteLine("Most pixels are: #" + most.Key);

        }
    }
}