Hi, For the frei0r tinkerers:
http://cg.postech.ac.kr/research/robust_c2g/ "This paper presents a fast color-to-gray conversion algorithm which robustly reproduces the visual appearance of a color image in grayscale. The conversion preserves feature discriminability and reasonable color ordering, while respecting the original lightness of colors, by simple optimization of a nonlinear global mapping. Experimental results show that our method produces convincing results for a variety of color images. We further extend the method to temporally coherent color-to-gray video conversion. " Alexandre Prokoudine http://libregraphicsworld.org
