Background Pony #7F88

Of course you can judge like that. Considering at least one format uses lossy compression, quality is a factor, not just file size.Would you judge JPEG vs PNG by recompressing the JPEG using PNG? JPEG loses fidelity because of DCT quantization. You would make a PNG from the same source the JPEG was made from.Apply the same for GIF vs APNG: Same input data, different results. GIF's limit of 256 colors requires color quantization, which leads to fidelity loss. APNG can avoid that.