Function image::imageops::colorops::brighten

pub fn brighten<I, P, S>(image: &I, value: i32) -> ImageBuffer<P, Vec<S>> where I: GenericImage<Pixel=P>,
        P: Pixel<Subpixel=S> + 'static,
        S: Primitive + 'static

Brighten the supplied image. value is the amount to brighten each pixel by. Negative values decrease the brightness and positive values increase it.