cocos2d iphone - Tiled maps look pixelated, but when moved, they look fine -

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i have tiled map in cocos2d-iphone. uses .png images.

sometimes, when closely enough, notice parts "pixelated". of bad quality. then, if move character (and map scrolls), fixes , looks normal. if keep on moving randomly, might see gets wrong again etc...

this never happened before until recently. weird because never touched tiled maps ever again.

what causing this? iphone 4, retina enabled.

the sprite positioned on sub-pixel, such 16.5f, cause distortion.


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