Some fiddling with gimp or something similar reveals that the file uses two different but very similar greens.

 

The easy method is to fiddle around with hue / lightness /saturation  untill you can slightly see the contained text.

 

Alternatively, you can convert the image to a format that uses a palette and assign a new palette to the image, which shows the contained text in more clarity:

 

 

Now i'm not a gfx person, so there probably are lots of better methods out there.

 

Solution is 

 

plainsight.

 

Solution redirects to: