Compression and resizing are generally predictable, but visual quality still depends on source resolution, format, compression settings, and how the destination platform displays the file.
Upscaling can enlarge an image and improve presentation, but it cannot recreate information that was never present in the source image. Very blurred, noisy, or heavily compressed files may show limited improvement.
Collage output depends on the source photos, crop positions, chosen aspect ratio, and layout. Users should inspect important faces, text, and edges before exporting a final composition.