Displayed below are the same 4 images placed in 3 paragraphs with different colored backgrounds.
1.03K PNG image not transparent 2.95K transparent PNG 1.13K transparent GIF matte white 1.14K transparent GIF matte black
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1.03K PNG image not transparent 2.95K transparent PNG 1.13K transparent GIF matte white 1.14K transparent GIF matte black
1.03K PNG image not transparent 2.95K transparent PNG 1.13K transparent GIF matte white 1.14K 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.