Function image::imageops::colorops::contrast

pub fn contrast<I, P, S>(image: &I, contrast: f32) -> ImageBuffer<P, Vec<S>> where I: GenericImage<Pixel=P>,
        P: Pixel<Subpixel=S> + 'static,
        S: Primitive + 'static

Adjust the contrast of the supplied image. contrast is the amount to adjust the contrast by. Negative values decrease the contrast and positive values increase the contrast.