pub struct BiLevel;
Expand description
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);
Trait Implementations
sourceimpl ColorMap for BiLevel
impl ColorMap for BiLevel
sourcefn has_lookup(&self) -> bool
fn has_lookup(&self) -> bool
Indicate NeuQuant implements lookup
.
sourcefn index_of(&self, color: &Luma<u8>) -> usize
fn index_of(&self, color: &Luma<u8>) -> usize
Returns the index of the closest match of color
in the color map. Read more
impl Copy for BiLevel
Auto Trait Implementations
impl RefUnwindSafe for BiLevel
impl Send for BiLevel
impl Sync for BiLevel
impl Unpin for BiLevel
impl UnwindSafe for BiLevel
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcepub fn borrow_mut(&mut self) -> &mut T
pub fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> Pointable for T
impl<T> Pointable for T
sourceimpl<T> ToOwned for T where
T: Clone,
impl<T> ToOwned for T where
T: Clone,
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcepub fn to_owned(&self) -> T
pub fn to_owned(&self) -> T
Creates owned data from borrowed data, usually by cloning. Read more
sourcepub fn clone_into(&self, target: &mut T)
pub fn clone_into(&self, target: &mut T)
🔬 This is a nightly-only experimental API. (
toowned_clone_into
)Uses borrowed data to replace owned data, usually by cloning. Read more