Whitenoir converts any image to a strictly two colour monochrome image. Using a really simple user interface it`s possible to convert any image in just three mouse clicks. The transformation is totally configurable. You can pick which two colours the resulting image should use and tweak the brightness threshold for the dark and light pixels to make your image more or less dark. You can use Whitenior for creating sharp bitmaps from pencil drawings

Screenshot of Whitenoir