ImageSharp.cs

using ImageSharp;

const int size = 150;
const int quality = 75;

Configuration.Default.AddImageFormat(new JpegFormat());

using (var input = File.OpenRead(inputPath))
{
    using (var output = File.OpenWrite(outputPath))
    {
        var image = new Image(input)
            .Resize(new ResizeOptions
            {
                Size = new Size(size, size),
                Mode = ResizeMode.Max
            });
        image.ExifProfile = null;
        image.Quality = quality;
        image.Save(output);
    }
}

namespace has changed to SixLabors.ImageSharp. You might update this because it's referenced here.

Never mind, the whole snippet is outdated 😬