GenericImage Trait
trait，提供操作圖像的函數，參數化圖像的像素類型。

# use image::{Pixel, Pixels}; pub trait GenericImage {/// The pixel type.type Pixel: Pixel;/// The width and height of this image.fn dimensions(&self) -> (u32, u32);/// The bounding rectangle of this image.fn bounds(&self) -> (u32, u32, u32, u32);/// Return the pixel located at (x, y)fn get_pixel(&self, x: u32, y: u32) -> Self::Pixel;/// Put a pixel at location (x, y)fn put_pixel(&mut self, x: u32, y: u32, pixel: Self::Pixel);/// Return an Iterator over the pixels of this image./// The iterator yields the coordinates of each pixel/// along with their valuefn pixels(&self) -> Pixels<Self>; }

圖像的表征
圖像提供了兩種主要的表示圖像數據的方法:

ImageBuffer

由像素類型參數化的圖像，由像素的寬度、高度和向量表示。它提供了對其像素的直接訪問，并實現了GenericImage Trait。

extern crate image;use image::{GenericImage, GenericImageView, ImageBuffer, RgbImage};// Construct a new RGB ImageBuffer with the specified width and height. let img: RgbImage = ImageBuffer::new(512, 512);// Construct a new by repeated calls to the supplied closure. let mut img = ImageBuffer::from_fn(512, 512, |x, y| {if x % 2 == 0 {image::Luma([0u8])} else {image::Luma([255u8])} });// Obtain the image's width and height. let (width, height) = img.dimensions();// Access the pixel at coordinate (100, 100). let pixel = img[(100, 100)];// Or use the `get_pixel` method from the `GenericImage` trait. let pixel = *img.get_pixel(100, 100);// Put a pixel at coordinate (100, 100). img.put_pixel(100, 100, pixel);// Iterate over all pixels in the image. for pixel in img.pixels() {// Do something with pixel. } 與50位技術專家面對面20年技術見證，附贈技術全景圖

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