空间里看到的png图片，点开大图会成变成另一张图。怎么做的？
今天在扣扣空间里看到一张图，小图是一个男孩躺在凌乱的房间里，点开之后就变成了男孩躺在星河里的图片，本来以为是gif，存了一下发现是png格式，这是怎么回事？求大神解释
回复内容：
今天正好转了这个说说。图的作者还是挺会玩的，不过道理很简单。
已经说了这张图是png，这个格式的图片是可以没有背景色的，或者说背景色可以透明。这张图前景色是白色的星星和人。所以你打开大图看见星空并不是图变了，而是看大图时候背景是黑色的，加上前景色就变成了星空。
屋子的线条也只不过是黑色65%左右透明度，所以点开大图之后有黑色的背景而看不见屋子。
作者只是利用图片格式做了个小把戏而已。
前面的答案已经解释过了，我就是来放个图~ PNG是可以做出透明色的。
当小图的时候，一般图片背景是白色(灰白色)，而打开时候是黑色背景。
所以我画一个灰白色的圆，一个黑色的正方，然后其他部分都是透明。然后你小图的时候灰白色的圆和透明色还是灰白色。所以就看到了正方形。打开以后背景变成了黑色，和黑色的方混在了一起，变成了灰白色的圆。
这个复杂化了加强接近的颜色，加上灰白色和黑色的半透明就变成一幅复杂的画了。
手机打得，图回去有空上。 我上图两张让你开开眼～
保存后你发给别人试试
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