What you can learn from your picture is just that it is of very low quality...
The truth is :
Colours are visible when you zoom because of the LCD screen (each pixel is divided into three colours) from which the picture was captured. The coloured pixels can still be faked tho, but it requires some effort.
If there are no colours on the letters, then the screencapture isn't a mere screencapture (from a LCD screen).