green_background - used when the image has a background that is completely or predominantly green in color.

Please note that green_background should only be used when the image has a background, that is, the post is set against a color, pattern etc. that is NOT part of the image but is used to frame or otherwise help image stand out.

For example an image focused on a character with a green wall in the background would not be labeled "green_background" because the wall is a distinct part of the scene in the image.