Image Downscaling

Question

I need a bit of a clarification on this Process. I am trying to downsize from 6000 * 4000 pixel to 960 * 960 for website space purpose using MagickImageMagic. Would doing the same from 2000 * 2000 to 960 * 960 make any impact on the quality of the image. I need some understanding weather I should proceed with capturing with resolution close to the target or should I go for high resolution for better quality.

    var imageforLightbox = new MagickImage(Path.Combine(SOURCE_PATH, filename));
    MagickGeometry size = new MagickGeometry(1920, 1080);
     size.IgnoreAspectRatio = false;
     imageforLightbox.Resize(size);