📺 图片加噪点（颗粒感）Add Noise to Image
给图片添加噪点：高斯噪点、均匀噪点、椒盐噪点或胶片颗粒，可调强度、单色或彩色噪点，用随机种子保证同样设置得到同样结果，也可一键换一组随机。适合做胶片质感、复古照片、打破渐变色带或制作测试图片，支持批量，图片只在浏览器本地处理。Add noise to an image: Gaussian, uniform, salt-and-pepper or film grain, with adjustable amount and mono or colour noise. A random seed gives the same result for the same settings, and one click rolls a new pattern. Good for a film look, vintage photos, breaking up gradient banding or making test images. Works in bulk, locally in your browser.
使用说明与常见问题How-to & FAQ
「图片加噪点（颗粒感）」是什么？What is the Add Noise to Image tool?
给图片添加噪点：高斯噪点、均匀噪点、椒盐噪点或胶片颗粒，可调强度、单色或彩色噪点，用随机种子保证同样设置得到同样结果，也可一键换一组随机。适合做胶片质感、复古照片、打破渐变色带或制作测试图片，支持批量，图片只在浏览器本地处理。Add noise to an image: Gaussian, uniform, salt-and-pepper or film grain, with adjustable amount and mono or colour noise. A random seed gives the same result for the same settings, and one click rolls a new pattern. Good for a film look, vintage photos, breaking up gradient banding or making test images. Works in bulk, locally in your browser.
如何使用「图片加噪点（颗粒感）」？How do I use the Add Noise to Image tool?
在「图片加噪点（颗粒感）」中，选择或拖入文件，按需设置「类型」、「强度」、「随机种子」、「输出格式」等选项，然后点击「换一组随机」、「全部下载（ZIP）」按钮即可。In the Add Noise to Image: Choose or drop your files, set "Type", "Amount", "Seed", "Format", then click "New random pattern", "Download all (ZIP)".
几种噪点有什么区别？What are the noise types?
高斯噪点：每个像素随机偏亮或偏暗，大多数变化很小，最接近相机高 ISO 的噪点。胶片颗粒：单色的高斯噪点，并且中间调最明显、暗部和亮部较弱，更像胶片的颗粒感。均匀噪点：在 ± 一定范围内平均随机，颗粒更“硬”。椒盐噪点：随机把一部分像素变成纯黑或纯白，常用于测试降噪算法。Gaussian: each pixel gets a little lighter or darker at random, mostly by small amounts — closest to high-ISO camera noise. Film grain: monochrome Gaussian noise that is strongest in the mid-tones and weaker in shadows and highlights, more like film. Uniform: evenly random within ± a range, for a harsher grain. Salt & pepper: a share of pixels become pure black or white at random, often used to test noise-reduction filters.
强度对应多少？What does the Amount mean?
高斯和胶片颗粒的标准差 σ = 强度 × 0.64（强度 25 时 σ≈16 个亮度级）；均匀噪点的范围是 ± 强度 × 1.1；椒盐噪点影响的像素比例是 强度 × 0.25%（强度 40 时约 10% 的像素）。结果旁会注明实际数值。For Gaussian and film grain the standard deviation is σ = Amount × 0.64 (about 16 levels at 25); uniform noise spans ± Amount × 1.1; salt & pepper affects Amount × 0.25% of pixels (about 10% at 40). The exact value is shown next to each result.
为什么要用随机种子？Why is there a random seed?
同样的种子和设置每次都生成一模一样的噪点，方便反复导出或批量处理时保持一致；点“换一组随机”会换一个种子，得到新的噪点分布。批量处理时每张图使用同一个种子。The same seed and settings always give exactly the same noise, so you can re-export or batch-process consistently. New random pattern picks a new seed for a fresh pattern. In a batch every image uses the same seed.
有哪些选项可以调整？What options can I adjust?
「图片加噪点（颗粒感）」的设置：「类型」可选 高斯噪点、胶片颗粒、均匀噪点、椒盐噪点（默认 高斯噪点）；「强度」默认 25，范围 0–100；「随机种子」默认 1，范围 0–4294967295；「输出格式」可选 PNG、JPG、WebP（默认 PNG）；「质量」默认 92，范围 40–100；可勾选：「单色噪点」；可选文件：常见图片格式（含 HEIC、HEIF、AVIF、WEBP、BMP、JFIF）。改动任一选项后结果会按新设置重新生成。Settings in the Add Noise to Image — "Type": Gaussian, Film grain, Uniform, Salt & pepper (default Gaussian); "Amount" default 25, range 0–100; "Seed" default 1, range 0–4294967295; "Format": PNG, JPG, WebP (default PNG); "Quality" default 92, range 40–100; tick boxes: "Monochrome noise"; files: common image formats (including HEIC, HEIF, AVIF, WEBP, BMP, JFIF). Changing any option regenerates the result with the new setting.
图片会被上传到服务器吗？Are my images uploaded?
不会。「图片加噪点（颗粒感）」使用浏览器 Canvas 在本地处理图片，处理后的文件直接从你的浏览器下载。No. The Add Noise to Image processes images locally with the browser Canvas API and the result downloads straight from your browser.
「图片加噪点（颗粒感）」免费吗？需要注册吗？Is the Add Noise to Image free? Do I need an account?
「图片加噪点（颗粒感）」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 Add Noise to Image is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.