Apparatus and methods for illuminating substances using color to achieve visual contrast

1. An illumination system for illuminating a first biologic substance and a second biologic substance, comprising:

a first light output device capable of outputting polychromatic first light;

a second light output device capable of outputting polychromatic second light, the first light and the second light having different spectra with respect to each other and selected such that (i) a first apparent color results when the first light is scattered from the first biologic substance and a second apparent color results when the second light is scattered from the first biologic substance, the first apparent color and the second apparent color being substantially the same as one another and (ii) a third apparent color results when the first light is scattered from the second biologic substance and a fourth apparent color results when the second light is scattered from the second biologic substance, the third apparent color and the fourth apparent color being substantially different than one another; and

means for temporally modulating amounts of the first light and amounts of the second light in a light output from the system.

2. The system of claim 1 , wherein at least one of the first light output device and the second light output device comprises a polychromatic source.

3. The system of claim 1 , wherein the first light output device and the second light output device comprise a common polychromatic source.

4. The system of claim 1 , wherein at least one of the first light output device and the second light output device comprises a monochromatic source.

5. The system of claim 1 , wherein the means for modulating is adapted to alternately provide the first light and the second light in the light output from the system.

6. The system of claim 1 , wherein the means for modulating is adapted to alter an amount of the first light and the second light in the light output from the system such that both the first light and the second light are output at a same time.

7. The system of claim 1 , wherein means for modulating comprises an electromechanical component for alternately positioning a first filter and a second filter to form the first light and the second light.

8. The system of claim 1 , wherein means for modulating comprises an electrical component for alternately enabling a first filter and a second filter to form the first light and the second light.

9. The system of claim 1 , wherein the first light output device comprises a first source and the second light output device comprises a second source, and wherein the means for modulating comprises an electrical component for altering an output from a first source and an output from a second source to alter the first light and the second light.

10. The system of claim 1 , wherein at least one of the first light output device and the second light output device comprises at least two LEDs.

11. A method of illuminating a first biologic substance and a second biologic substance, comprising:

outputting onto, both, the first biologic substance and the second biologic substance A) a modulated polychromatic first light, and B) a modulated polychromatic second light,

(i) scattering of the first light by the first biologic substance giving rise to a first apparent color and scattering of the second light by the first biologic substance giving rise to a second apparent color, the first apparent color and the second apparent color being substantially the same as one another, and

(ii) scattering of the first light by the second biologic substance giving rise to a third apparent color and scattering of the second light by the second biologic substance giving rise to a fourth apparent color, the third apparent color and the fourth apparent color being substantially different from one another.

12. The method of claim 11 , further comprising producing at least one of the first light and the second light using a polychromatic source.

13. The method of claim 12 , wherein the step of producing comprises using the polychromatic source to produce the first light and the second light.

14. The method of claim 11 , further comprising producing at least one of the first light and the second light using a monochromatic source.

15. The method of claim 11 , wherein the step of outputting comprises alternately outputting the first light and the second light onto, both, the first biologic substance and the second biologic substance.

16. The system of claim 11 , wherein the step of outputting comprises modulating an amount of the first light and an amount of the second light such that the first light and the second light are projected onto, both, the first biologic substance and the second biologic substance at a same time.

17. The system of claim 11 , wherein the step of outputting comprises alternately positioning a first filter and a second filter in a light from a source to form the first light and the second light.

18. The system of claim 11 , wherein the step of outputting comprises using an electrical component to enable a first filter and a second filter to form the first light and the second light.

19. The system of claim 11 , wherein the step of outputting comprises altering an amount of light output from a first source and an amount of light output from a second source.