Struct `BiLevel`

struct BiLevel

A bi-level color map

Examples

use image::imageops::colorops::{index_colors, BiLevel, ColorMap};
use image::{ImageBuffer, Luma};

let (w, h) = (16, 16);
// Create an image with a smooth horizontal gradient from black (0) to white (255).
let gray = ImageBuffer::from_fn(w, h, |x, y| -> Luma<u8> { [(255 * x / w) as u8].into() });
// Mapping the gray image through the `BiLevel` filter should map gray pixels less than half
// intensity (127) to black (0), and anything greater to white (255).
let cmap = BiLevel;
let palletized = index_colors(&gray, &cmap);
let mapped = ImageBuffer::from_fn(w, h, |x, y| {
    let p = palletized.get_pixel(x, y);
    cmap.lookup(p.0[0] as usize)
        .expect("indexed color out-of-range")
});
// Create an black and white image of expected output.
let bw = ImageBuffer::from_fn(w, h, |x, y| -> Luma<u8> {
    if x <= (w / 2) {
        [0].into()
    } else {
        [255].into()
    }
});
assert_eq!(mapped, bw);

Implementations

`impl Clone for BiLevel`

fn clone(self: &Self) -> BiLevel

`impl ColorMap for BiLevel`

fn index_of(self: &Self, color: &Luma<u8>) -> usize
fn lookup(self: &Self, idx: usize) -> Option<<Self as >::Color>
fn has_lookup(self: &Self) -> bool: Indicate NeuQuant implements lookup.
fn map_color(self: &Self, color: &mut Luma<u8>)

`impl Copy for BiLevel`

`impl Freeze for BiLevel`

`impl RefUnwindSafe for BiLevel`

`impl Send for BiLevel`

`impl Sync for BiLevel`

`impl Unpin for BiLevel`

`impl UnwindSafe for BiLevel`

`impl<T> Any for BiLevel`

fn type_id(self: &Self) -> TypeId

`impl<T> Borrow for BiLevel`

fn borrow(self: &Self) -> &T

`impl<T> BorrowMut for BiLevel`

fn borrow_mut(self: &mut Self) -> &mut T

`impl<T> CloneToUninit for BiLevel`

unsafe fn clone_to_uninit(self: &Self, dest: *mut u8)

`impl<T> From for BiLevel`

fn from(t: T) -> T: Returns the argument unchanged.

`impl<T> Pointable for BiLevel`

unsafe fn init(init: <T as Pointable>::Init) -> usize
unsafe fn deref<'a>(ptr: usize) -> &'a T
unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T
unsafe fn drop(ptr: usize)

`impl<T> ToOwned for BiLevel`

fn to_owned(self: &Self) -> T
fn clone_into(self: &Self, target: &mut T)

`impl<T, U> Into for BiLevel`

fn into(self: Self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of [From]<T> for U chooses to do.

`impl<T, U> TryFrom for BiLevel`

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

`impl<T, U> TryInto for BiLevel`

fn try_into(self: Self) -> Result<U, <U as TryFrom<T>>::Error>