GemBox.Imaging
.NET Imaging Library

static void Main()
{
    // If using Professional version, put your serial key below.
    ComponentInfo.SetLicense("FREE-LIMITED-KEY");

    // Load an image from a JPEG file.
    using var image = Image.Load("FragonardReader.jpg");

    // Resize the image to 128 x 85 pixels.
    image.Resize(128, 85);

    // Save the image as a PNG file.
    image.Save("FragonardReader.png");
}