Grayscale

功能说明What It Does

JPG灰度化工具一键将彩色图片转换为灰度效果,内置亮度 (BT.601)、感知 (BT.709)、平均三种算法。亮度与感知算法按人眼对红绿蓝的敏感度加权,平均算法三通道等权,饱和度高的区域差异更明显。

This tool converts color images to grayscale in one click, with three algorithms: luminance (BT.601), perceptual (BT.709) and average. The first two weight channels by human sensitivity; average treats RGB equally, so the difference shows most on saturated colors.

全部在浏览器本地完成,数据不会上传。

Everything runs locally in your browser - nothing is uploaded.

算法差异Algorithm differences

默认「亮度」适合绝大多数照片;「感知」符合高清视频标准,绿色略提亮;「平均」适合图标与线条素材,但纯红/纯蓝的灰度可能偏暗或偏亮。

Luminance (default) fits most photos; perceptual follows the HD video standard with slightly brighter greens; average suits icons and line art, though pure red/blue may look too dark or too bright.

使用步骤How to Use

1. 上传图片。Upload an image.
2. 切换算法对比效果。Switch algorithms to compare.
3. 满意后「导出JPG」。Click "Export JPG" when satisfied.

常见问题FAQ