Aspects
Libpng
Libpng is the offical PNG reference library, supporting most all of PNG's features, is extensible, and has been widely used and tested for over twenty years.
Zlib
Zlib is a library used for data compression
Others
| Quality | Example |
|---|---|
| Worse |
"Several things i found in the cocos2d forums lead me to believe it s an issue with the zlib implementation on ios but i ve tried using both stb_image and lodepng to avoid zlib and those libraries actually performed even worse than libpng" from question "Horrific libPNG performance on iOS" |