InstagramBatchResize Project

InstagramBatchResize.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="SixLabors.Imagesharp" Version="3.1.6" />
  </ItemGroup>

</Project>

Program.cs

using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Formats.Jpeg;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;

if(args.Length < 2) {
    Console.WriteLine("Parameters: <input directory> <output directory>");
    Console.WriteLine("Note: output directory will be created if not existing");
    return 1;
}

var inputFolder = args[0];
var outputFolder = args[1];

if(!Directory.Exists(inputFolder)) {
    Console.WriteLine("Input directory doesn't exist");
    return 2;
}
Directory.CreateDirectory(outputFolder);


foreach (var inputFile in Directory.GetFiles(inputFolder, "*.jpg", SearchOption.AllDirectories))
{
    var outputFile = Path.Combine(outputFolder, Path.GetRelativePath(inputFolder, inputFile));
    var dirName = Path.GetDirectoryName(outputFile);
    if (dirName is null)
    {
        Console.WriteLine($"Invalid folder for {outputFile}");
        return 1;
    }
    Directory.CreateDirectory(dirName);
    if (File.Exists(outputFile))
    {
        continue;
    }
    using var image = Image.Load<Rgba32>(inputFile);
    int targetWidth, targetHeight;

    if (image.Width > image.Height)
    {
        // Landscape
        targetWidth = 1080;
        targetHeight = 566;
    }
    else
    {
        // Portrait
        targetWidth = 1080;
        targetHeight = 1350;
    }
    Console.WriteLine($"{outputFile} {image.Width}x{image.Height} -> {targetWidth}x{targetHeight}");
    image.Mutate(x => x.Resize(new ResizeOptions
    {
        Size = new Size(targetWidth, targetHeight),
        PadColor = Color.Black,
        Mode = ResizeMode.Pad,
        Sampler = KnownResamplers.Lanczos3
    }));
    var encoder = new JpegEncoder { Quality = 90 };
    image.Save(outputFile, encoder);
}
return 0;