Img23 (Windows Vista)

img23, originally known as NORTHERN LIGHTS, DENALI NATIONAL PARK, ALASKA, is a wallpaper included in Windows Vista, licensed from Getty Images. It was taken by George D. Lepp, who also took Windows 2000's Gold Petals. It depicts northern lights over a lake at Denali National Park, Alaska, USA. It appears Microsoft added a sharpening effect to the image, resulting in it looking more clear than the original.

There is also a widescreen variant, img31. This oddly lacks the sharpening effect used on img23.