Berufsschule_HAM/src/Helpers/ImageHelper.cs

using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Processing;
using SixLabors.ImageSharp.Formats.Jpeg;
using System.IO;
using SixLabors.ImageSharp.Formats.Gif;
using SixLabors.ImageSharp.Processing.Processors.Quantization;
using SixLabors.ImageSharp.Formats.Png;
using SixLabors.ImageSharp.Formats.Webp;

namespace Berufsschule_HAM.Helpers;

public static class ImageHelper
{
    public static string ResizeAndConvertToBase64(byte[] imageBytes, int size = 32)
    {
        using var inputStream = new MemoryStream(imageBytes);
        using var image = Image.Load(inputStream);

        // Optional: crop to square before resize
        int minDimension = Math.Min(image.Width, image.Height);
        var cropRectangle = new Rectangle(
            (image.Width - minDimension) / 2,
            (image.Height - minDimension) / 2,
            minDimension,
            minDimension);

        image.Mutate(x =>
        {
            x.Crop(cropRectangle);
            x.Resize(new ResizeOptions
            {
                Size = new Size(size, size),
                Mode = ResizeMode.Crop
            });
        });

        using var outputStream = new MemoryStream();
        image.Save(outputStream, new WebpEncoder(){});
        return Convert.ToBase64String(outputStream.ToArray());
    }
}