Whiten skin color in an image

Question

Is there any theory or image filter for whitening the skin color in an image on iPhone ?

I have the RGB data on hand. But whatever I change, it cannot archieve my needs. I alter the RGB as follows:

New value of R/G/B = (int)roundf(Old R/G/B - 128) * contrast_value + 128 + brightness_value);

Where contrast_value = 1 to 1.3 and brightness_value = 0 to 50

But I found that it comes to pale yellow ...

Next you'll be wondering how to apply this outside of the iPhone... Kind of a scary question. (And honestly hard to imagine a typical use case. Why do you need to lighten the skin tones separately from the rest of an image?) — Cody Gray - on strike, Feb 28 '11 at 10:23
A camera application with a WHITENING filter. So whenever a photo is taken, user can adjust to make the face of person more white — SkyEagle888, Mar 02 '11 at 23:40

score 2 · Answer 1 · edited May 23 '17 at 12:31

2

Convert your image to YUV colorspace first. This gives you two advantages:

edited May 23 '17 at 12:31

Community

answered Mar 01 '11 at 12:32

mpenkov

score 0 · Answer 2 · edited May 23 '17 at 12:31

0

One thing I have seen to work is to add a constand value to all the three components of the color, like R + 0x33 G + 0x33 B + 0x33

EDITED: I just found another thread that has additional information: Programmatically Lighten a Color

edited May 23 '17 at 12:31

Community

answered Feb 28 '11 at 10:21

Krishna

2 Answers2