✨ 位图锐化（BMP 反锐化掩模 / 拉普拉斯）Sharpen a Bitmap
锐化位图（BMP）或其他图片：反锐化掩模（Unsharp Mask）先做轻微模糊再把细节按强度加回去，边缘清晰又不容易出现杂色；拉普拉斯锐化用 3×3 核对边缘直接加重，效果更“硬”。强度 0–200% 可调（100% 为常用默认），强度 0 等于不做任何改动。透明像素按预乘 Alpha 处理。默认导出 24 位 BMP，也可导出 PNG，支持批量，图片只在浏览器本地处理。Sharpen a bitmap (BMP) or any other image. Unsharp Mask blurs a copy and adds the detail back by the amount you set — clear edges without too much noise — while Laplacian sharpening uses a 3×3 kernel for a harder edge boost. Amount goes from 0 to 200% (100% is a useful default); amount 0 leaves the image unchanged. Transparency uses premultiplied alpha. The result is a 24-bit BMP by default, or PNG; works in bulk, locally in your browser.
使用说明与常见问题How-to & FAQ
「位图锐化（BMP 反锐化掩模 / 拉普拉斯）」是什么？What is the Sharpen a Bitmap tool?
锐化位图（BMP）或其他图片：反锐化掩模（Unsharp Mask）先做轻微模糊再把细节按强度加回去，边缘清晰又不容易出现杂色；拉普拉斯锐化用 3×3 核对边缘直接加重，效果更“硬”。强度 0–200% 可调（100% 为常用默认），强度 0 等于不做任何改动。透明像素按预乘 Alpha 处理。默认导出 24 位 BMP，也可导出 PNG，支持批量，图片只在浏览器本地处理。Sharpen a bitmap (BMP) or any other image. Unsharp Mask blurs a copy and adds the detail back by the amount you set — clear edges without too much noise — while Laplacian sharpening uses a 3×3 kernel for a harder edge boost. Amount goes from 0 to 200% (100% is a useful default); amount 0 leaves the image unchanged. Transparency uses premultiplied alpha. The result is a 24-bit BMP by default, or PNG; works in bulk, locally in your browser.
如何使用「位图锐化（BMP 反锐化掩模 / 拉普拉斯）」？How do I use the Sharpen a Bitmap tool?
在「位图锐化（BMP 反锐化掩模 / 拉普拉斯）」中，选择或拖入文件，按需设置「强度」、「方式」、「输出格式」等选项，然后点击每个结果旁的「下载」按钮即可；有多个文件时也可以点「全部下载（ZIP）」一次打包下载。In the Sharpen a Bitmap: Choose or drop your files, set "Amount", "Type", "Format", then click the Download button next to each result (with several files, "Download all (ZIP)" saves them together).
两种锐化有什么区别？How do the two methods differ?
反锐化掩模先轻微模糊再把“原图 − 模糊图”的细节按强度加回去，过渡自然，照片和插画常用。拉普拉斯用固定的 3×3 核直接加强边缘，效果更硬、更像印刷制版。强度 0 等于不做任何改动。Unsharp mask blurs a copy and adds the (original − blurred) detail back by the amount you set — a natural look common for photos and illustrations. Laplacian uses a fixed 3×3 kernel to boost edges more harshly, closer to a print plate. Amount 0 leaves the image unchanged.
会不会出现白边或噪点？Will I get halos or noise?
强度过高时，反锐化掩模会在强边缘旁出现浅色光晕，拉普拉斯则更容易放大原本的噪点。建议从 50–100% 试起；已经很锐的截图通常不需要再锐化。Too high an amount can put light halos beside strong edges with unsharp mask, and Laplacian is more likely to amplify existing noise. Try 50–100% first; screenshots that are already sharp rarely need more.
导出的 BMP 是什么格式？What kind of BMP is produced?
默认导出 24 位不压缩 BMP（BITMAPINFOHEADER，自下而上存储），Windows 画图、Photoshop、GIMP、Python Pillow 和各种嵌入式工具都能直接打开。BMP 不支持透明，透明部分会填成白色并在结果里提示；需要保留透明请导出 PNG。By default a 24-bit uncompressed BMP (BITMAPINFOHEADER, stored bottom-up), which Windows Paint, Photoshop, GIMP, Python Pillow and embedded tools open directly. BMP has no transparency, so transparent areas are filled with white (the result says so); export PNG to keep transparency.
支持哪些图片？会上传吗？Which images work, and are they uploaded?
支持 JPG、PNG、WebP、GIF（静态或动图的第一帧）、BMP、AVIF、HEIC，以及浏览器能打开的 SVG；可一次拖入最多 50 张批量处理，单张最大 60 MB、1 亿像素；多张结果可打包成 ZIP 下载。所有处理都在你的浏览器里完成，图片不会上传，结果中也不会保留 EXIF 等元数据（包括拍摄位置）。JPG, PNG, WebP, GIF (a still or the first frame of an animation), BMP, AVIF, HEIC, and SVG that the browser can open. Drop in up to 50 images at once; each can be up to 60 MB and 100 megapixels, and several results can be downloaded as a ZIP. Everything happens in your browser: images are not uploaded, and EXIF and other metadata (including location) is not kept in the results.
「位图锐化（BMP 反锐化掩模 / 拉普拉斯）」免费吗？需要注册吗？Is the Sharpen a Bitmap free? Do I need an account?
「位图锐化（BMP 反锐化掩模 / 拉普拉斯）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Sharpen a Bitmap is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.