Gyazo has a minimal user interface consisting of a small set of options available by right clicking the taskbar icon. Launching the application displays a crosshair cursor with which the user selects the area to be uploaded.
Surprisingly, many people think of metal roofs as having limited color options. Perhaps they think the color matches the type of metal. Silver for steel, tin and aluminum; reddish-brown for copper; dark gray for lead. As if those are the extent of the color options.
This Old House replies: The black mold-like stains and streaks that appear on roofs, particularly light-colored asphalt shingles, is actually a blue-green algae (Gloeocapsa magma). Commonly found in climates with warm, humid summers, it does no damage to the roofing, but it certainly does looks bad.