Function picto::processing::blur::by

pub fn by<'i, I, PI, CI, PO, CO>(
    input: I, 
    sigma: f32
) -> Buffer<PO, CO, Vec<CO>> where
    PO: From<Rgba> + Into<Rgba>,
    PO: Read<CO> + Write<CO>,
    CO: Channel,
    PI: Into<Rgba>,
    PI: Read<CI>,
    CI: Channel,
    I: Into<Read<'i, PI, CI>>, 

Blur by the given radius.