Remove grain and color speckles from noisy photos using OpenCV's non-local means denoiser — the same algorithm behind many desktop tools. Tune luminance and chroma strength separately and pick a quality preset. Supported media processing runs locally; your image content is not uploaded for supported processing workflows.
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Remove grain and color speckles from noisy photos using OpenCV's non-local means denoiser — the same algorithm behind many desktop tools. Tune luminance and chroma strength separately and pick a quality preset. Supported media processing runs locally; your image content is not uploaded for supported processing workflows.
NL-means 不只是对相邻像素取平均，而是在一个窗口内搜索附近各处相似的图像块，然后对这些图像块取平均。这样重复出现的纹理得以保留，而随机的传感器噪点则相互抵消。
亮度强度针对的是明暗颗粒；颜色强度针对的是色度斑点（也就是高 ISO 拍摄中常见的红绿色斑块）。颜色噪点通常能承受更强的滤波处理，而不会造成可见的细节损失。
在高强度下，一定程度的柔化是难以避免的。建议从 10/10 左右开始，检查头发、织物这类精细纹理，并优先只提高颜色强度——清理色度噪点几乎不会影响观感锐度。