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Why does this PNG image on twitter look different when clicked?


Question

This morning on twitter there was a tweet with the text "click on this picture". When picture is clicked, it's opened in wider viewer, but looks completely different.

I tried to analyze this picture in ACDSee, and I also tried uploading on Facebook, but it's happening only when embedded on twitter. I don't have much knowledge about graphics so please explain this to me. Why does this PNG image change only when clicked on Twitter?

Screenshots (left = before clicking; right = after clicking):

Before clicking After clicking

Here's the original picture.

2014/08/12
1
16
8/12/2014 8:42:00 PM

Accepted Answer

The picture doesn't change. The background color of the page does.

It's a transparent PNG. The whites are not visible on a white background. The blacks aren't visible on black background.

The normal post is on white. The modal view is on black.

If you change the background color...

Black White

2014/08/08
25
8/8/2014 5:55:00 AM