  Face retouching aims to remove facial blemishes, such as pigmentation and
acne, and still retain fine-grain texture details. Nevertheless, existing
methods just remove the blemishes but focus little on realism of the
intermediate process, limiting their use more to beautifying facial images on
social media rather than being effective tools for simulating changes in facial
pigmentation and ance. Motivated by this limitation, we propose our
Controllable and Gradual Face Retouching (CGFR). Our CGFR is based on physical
modelling, adopting Sum-of-Gaussians to approximate skin subsurface scattering
in a decomposed melanin and haemoglobin color space. Our CGFR offers a
user-friendly control over the facial blemishes, achieving realistic and
gradual blemishes retouching. Experimental results based on actual clinical
data shows that CGFR can realistically simulate the blemishes' gradual
recovering process.
