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Cargo.toml

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+[package]
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+version = "0.1.0"
+authors = ["red <red@red9.space>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+image = "0.23.4"

src/main.rs

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+extern crate image;
+
+use std::fs::File;
+
+fn main() {
+    let imgx = 320;
+    let imgy = 240;
+
+    let mut imgbuf = image::ImageBuffer::new(imgx, imgy);
+
+    for (x, y, pixel) in imgbuf.enumerate_pixels_mut() {
+        let r = (x * 255 / imgx) as u8;
+        let g = (y * 255 / imgy) as u8;
+        *pixel = image::Rgb([r, g, 100]);
+    }
+
+    imgbuf.save("hello.png").unwrap();
+}