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<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="API documentation for the Rust `GrayImage` type in crate `image`."><metaname="keywords"content="rust, rustlang, rust-lang, GrayImage"><title>image::GrayImage - Rust</title><linkrel="stylesheet"type="text/css"href="../normalize.css"><linkrel="stylesheet"type="text/css"href="../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../dark.css"><linkrel="stylesheet"type="text/css"href="../light.css"id="themeStyle"><scriptsrc="../storage.js"></script><noscript><linkrel="stylesheet"href="../noscript.css"></noscript><linkrel="shortcut icon"href="../favicon.ico"><styletype="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><bodyclass="rustdoc type"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="sidebar"><divclass="sidebar-menu">☰</div><ahref='../image/index.html'><divclass='logo-container'><imgsrc='../rust-logo.png'alt='logo'></div></a><pclass='location'>Type Definition GrayImage</p><divclass="sidebar-elems"><divclass="block items"><aclass="sidebar-title"href="#methods">Methods</a><divclass="sidebar-links"><ahref="#method.expand_palette">expand_palette</a></div></div><pclass='location'><ahref='index.html'>image</a></p><script>window.sidebarCurrent={name:'GrayImage',ty:'type',relpath:''};</script><scriptdefersrc="sidebar-items.js"></script></div></nav><divclass="theme-picker"><buttonid="theme-picker"aria-label="Pick another theme!"><imgsrc="../brush.svg"width="18"alt="Pick another theme!"></button><divid="theme-choices"></div></div><scriptsrc="../theme.js"></script><navclass="sub"><formclass="search-form js-only"><divclass="search-container"><div><selectid="crate-search"><optionvalue="All crates">All crates</option></select><inputclass="search-input"name="search"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"></div><aid="settings-menu"href="../settings.html"><imgsrc="../wheel.svg"width="18"alt="Change settings"></a></div></form></nav><sectionid="main"class="content"><h1class='fqn'><spanclass='out-of-band'><spanid='render-detail'><aid="toggle-all-docs"href="javascript:void(0)"title="collapse all docs">[<spanclass='inner'>−</span>]</a></span><aclass='srclink'href='../src/image/buffer.rs.html#802'title='goto source code'>[src]</a></span><spanclass='in-band'>Type Definition <ahref='index.html'>image</a>::<wbr><aclass="type"href=''>GrayImage</a></span></h1><preclass='rust typedef'>type GrayImage = <aclass="struct"href="../image/struct.ImageBuffer.html"title="struct image::ImageBuffer">ImageBuffer</a><<aclass="struct"href="../image/struct.Luma.html"title="struct image::Luma">Luma</a><<aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>>, <aclass="struct"href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html"title="struct alloc::vec::Vec">Vec</a><<aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>>>;</pre><divclass='docblock'><p>Sendable grayscale image buffer</p>
</div><h2id='methods'class='small-section-header'>Methods<ahref='#methods'class='anchor'></a></h2><h3id='impl'class='impl'><codeclass='in-band'>impl <aclass="type"href="../image/type.GrayImage.html"title="type image::GrayImage">GrayImage</a></code><ahref='#impl'class='anchor'></a><aclass='srclink'href='../src/image/buffer.rs.html#742-774'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.expand_palette'class="method"><codeid='expand_palette.v'>pub fn <ahref='#method.expand_palette'class='fnname'>expand_palette</a>(<br> self, <br> palette: <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&[</a><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>, <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>, <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>, <br> transparent_idx: <aclass="enum"href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>><br>) -><aclass="type"href="../image/type.RgbaImage.html"title="type image::RgbaImage">RgbaImage</a></code><aclass='srclink'href='../src/image/buffer.rs.html#746-773'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Expands a color palette by re-using the existing buffer.
Assumes 8 bit per pixel. Uses an optionally transparent index to
adjust it's alpha value accordingly.</p>
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