Why same PNG images look pixel difference on the screen?

cocos2d-x C++
#1

Hi every,
I addChild some same PNG images, but they look pixel difference on the screen,
not only PNG, even my glLine have the same problem, some of them look differently vague.
could anybody tell my why…Thanks!


1.png (6.7 KB)


2.png (6.5 KB)


1.png (6.7 KB)