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All the true comments above notwithstanding, any edge preserving smoothing like the bilateral filter or median filter, will tend to make (facial) skin look smoother, and hence younger. Slightly increasing the skin color saturation will give it more vitality. There are lots of Photoshop tutorials how to manually do what you're asking, and a lot of the Photoshop functionality can be reproduced with OpenCV.

All the true comments above notwithstanding, any edge preserving smoothing like the bilateral filter or median filter, will tend to make (facial) skin look smoother, and hence younger. Slightly increasing the skin color saturation will give it more vitality. There are lots of Photoshop tutorials how to manually do what you're asking, and a lot of the Photoshop functionality can be reproduced with OpenCV.

All the true comments above notwithstanding, any edge preserving smoothing like the bilateral filter or median filter, will tend to make (facial) skin look smoother, and hence younger. Slightly increasing the skin color saturation will give it more vitality. There are lots of Photoshop tutorials how to manually do what you're asking, and a lot of the Photoshop functionality can be reproduced with OpenCV.

All the true comments above notwithstanding, any edge preserving smoothing like the bilateral filter or median filter, will tend to make (facial) skin look smoother, and hence younger. .
Slightly increasing the skin color saturation will give it more vitality. vitality.
There are lots of Photoshop tutorials how to manually do what you're asking, and a lot of the Photoshop functionality can be reproduced with OpenCV.