projecting light and shadows on a surface.

asked 2013-05-01 18:24:30 -0600

hamid
6 ●2

Hi I am trying to extract the lighting and the shadow from one surface and apply it to another type of surface. I convert the image to HSV and extract the Hue component and plot it which seems to give me a good indication of where the lighting and shadows are. However when I swap the hue component of the original image with my final image I get all sorts of greens and blues that are not desired. Are there any other techniques that can be used to project shadow and lighting?

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answered 2013-05-02 06:08:52 -0600

Guanta
6736 ●6 ●25 ●79

Swapping hue components? Seems like a strange way to adapt a light condition, I don't know if it goes that easy. Imho you need to get the correct light direction and light parameters, i.e. you need to model the light (e.g. via a Phong-model) and get all parameters for it from your source image - this is an optimization problem. Then you need to adapt these light parameters to your destination image, i.e. unlight it and relight it with your estimated parameters.