JPEGでコピーしまくって画像を劣化させるプログラムです

JpegCopy.cs

using System;
using System.Drawing;

class Program
{
    static void Main()
    {
        Console.WriteLine("input file path");
        var input = Console.ReadLine();
        Console.WriteLine("input the number of copying");
        var n = int.Parse(Console.ReadLine());
        
        var img1 = new Bitmap(input);
        img1.Save("temp.jpg");
        
        for(int i = 0 ; i<n ; i++ )
        {
            var temp1 = new Bitmap("temp.jpg");
            var temp = new Bitmap(temp1);
            
            if( i%(n/10) == 0 ){
                temp.Save(i.ToString()+".png");
            }
            
            temp1.Dispose();
            
            // https://dobon.net/vb/dotnet/graphics/encoderparameters.html
            var eps = new System.Drawing.Imaging.EncoderParameters(1);
            var ep = new System.Drawing.Imaging.EncoderParameter(
                System.Drawing.Imaging.Encoder.Quality, (long)100-i*100/n);
            
            //Console.WriteLine((long)100-i*100/n);
            
            eps.Param[0] = ep;
            var ici = GetEncoderInfo("image/jpeg");
            
            temp.Save("temp.jpg",ici,eps);
            temp.Dispose();
        }
    }
    
    //MimeTypeで指定されたImageCodecInfoを探して返す
    private static System.Drawing.Imaging.ImageCodecInfo
        GetEncoderInfo(string mineType)
    {
        //GDI+ に組み込まれたイメージ エンコーダに関する情報をすべて取得
        System.Drawing.Imaging.ImageCodecInfo[] encs =
            System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders();
        //指定されたMimeTypeを探して見つかれば返す
        foreach (System.Drawing.Imaging.ImageCodecInfo enc in encs)
        {
            if (enc.MimeType == mineType)
            {
                return enc;
            }
        }
        return null;
    }

    //ImageFormatで指定されたImageCodecInfoを探して返す
    private static System.Drawing.Imaging.ImageCodecInfo
        GetEncoderInfo(System.Drawing.Imaging.ImageFormat f)
    {
        System.Drawing.Imaging.ImageCodecInfo[] encs =
            System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders();
        foreach (System.Drawing.Imaging.ImageCodecInfo enc in encs)
        {
            if (enc.FormatID == f.Guid)
            {
                return enc;
            }
        }
        return null;
    }
}
/*
DSC_2122.jpg
animal_ratel.png
1001
1
*/