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+---
+title: extensionTypes.ImageDetails
+slug: Mozilla/Add-ons/WebExtensions/API/extensionTypes/ImageDetails
+l10n:
+  sourceCommit: b8a0743ca8b1e1b1b1a95cc93a4413c020f11262
+---
+
+{{AddonSidebar}}
+
+有关捕获图片格式、质量、区域和比例的详细信息。
+
+## 类型
+
+该类型的取值是对象，包含下列属性：
+
+- `format` {{optional_inline}}
+  - : {{WebExtAPIRef('extensionTypes.ImageFormat')}}。结果图片的格式，默认为 `"png"`。
+- `quality` {{optional_inline}}
+  - : `integer`。当格式是 `"jpeg"` 时，这将决定结果图片的质量。这应是 0—100 之间的数字，并将被转换为 0—1 之间的取值作为 [`HTMLCanvasElement.toDataURL()`](/zh-CN/docs/Web/API/HTMLCanvasElement/toDataURL) 方法的 `encoderOptions` 参数传递给函数。在属性被忽略时将采用 92 作为默认取值。随着质量的降低，结果图片将有更多视觉伪影，存储所需的字节数也将减少。当图片格式设置为 PNG 时，该值将被忽略。
+- `rect` {{optional_inline}}
+
+  - : `object`，指定要捕获的文档区域，单位为 CSS 像素，相对于页面。所有属性默认为 `0`。这些属性是：
+
+    - `x`：矩形左侧的坐标。
+    - `y`：矩形顶部的坐标。
+    - `width`：矩形的宽度。
+    - `height`：矩形的高度。
+
+    该选项在 Firefox 82 中引入。若省略该属性，则将捕获当前可视视口。
+
+- `scale` {{optional_inline}}
+  - : `number`，渲染的比例，默认为 [`devicePixelRatio`](/zh-CN/docs/Web/API/Window/devicePixelRatio)。该选项在 Firefox 82 中引入。
+
+## 浏览器兼容性
+
+{{Compat}}
+
+{{WebExtExamples}}
+
+> [!NOTE]
+> 此 API 基于 Chromium 的 [`chrome.extensionTypes`](https://developer.chrome.com/docs/extensions/reference/api/extensionTypes/#type-ImageDetails) API。该文档衍生自 Chromium 代码中的 [`extension_types.json`](https://chromium.googlesource.com/chromium/src/+/master/extensions/common/api/extension_types.json)。
+
+<!--
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