Dispayed below are the same 4 images placed in 3 paragraphs with different colored backgrounds.
4K PNG image not transparent 4K transparent PNG 4K transparent GIF matte white 4K transparent GIF matte black
4K PNG image not transparent 4K transparent PNG 4K transparent GIF matte white 4K transparent GIF matte black
4K PNG image not transparent 4K transparent PNG 4K transparent GIF matte white 4K transparent GIF matte black
As you can see the transparent PNG adapts to any background color with no fringe of anti-aliasing pixels. Although it produces a larger file size, the PNG transparency is much more effective.