Edi said:When I shine two different lights at a single spot on a white screen, say, yellow and blue, they both hit the spot and get reflected all mixed up and I see green. Thats all fine,
Edi said:When I shine two different lights at a single spot on a white screen, say, yellow and blue, they both hit the spot and get reflected all mixed up and I see green. Thats all fine, but what is the actual structure of that reflected, in this case, green light? Is it a ordinary green photon with its corresponding frequency? (say, 510nm )or is it the same blue and yellow photons, but our eyes just detect both at the same time, from the same spot, and interpret it as green?
Yes, this effect is called http://en.wikipedia.org/wiki/Metamerism_(color)"Edi said:So, with nothing but my natural sensors (eyes), I cannot know if I am looking at a green color (or any other color) or a combination of two or several..
nasu said:The light reflected from the white screen contains the yellow and blue photons. The normal reflection does not change the frequency of the photons.
The sensation of green is a physiologic effect due to simultaneous excitation of the receptors in the retina. The reflection is irrelevant actually. If you send the two beams directly to the eye you'll see green too.
Blue paint reflects more blue photons and yellow paint reflects more yellow photons. A mixture of blue and yellow paint will reflect both blue and yellow light (unless there is some interaction between the pigments which will change their nature). For solid pigments (like oxides) you can still see individual grains (and their individual color) with a microscope whereas the overall sensation is that of the "mixture color". The yellow pigment does not "eliminate" the blue photons reflected by the blue pigment.sweet springs said:Hi.
Is it true we see green color when blue photons and yellow photons are coming together into eye ?
As for paint mix of blue paint and yellow paint cause deletion of two complimentary colors and only almost green color can be reflected.
how about addition of blue photon and yellow photon?
Mix of various paint is black, however, mix of various photon is white.
Regards.
Delta Kilo said:Yes, this effect is called http://en.wikipedia.org/wiki/Metamerism_(color)"
sweet springs said:As for paint mix of blue paint and yellow paint cause deletion of two complimentary colors and only almost green color can be reflected.
how about addition of blue photon and yellow photon?
Mix of various paint is black, however, mix of various photon is white.
Mixed and reflected color frequencies refer to the wavelengths of light that are perceived by our eyes as different colors. When multiple wavelengths of light are combined or when light is reflected off of a surface, we perceive a specific color based on the frequencies present.
Our eyes contain special cells called cones that respond to different wavelengths of light. These cones are responsible for color vision and when they are stimulated by specific frequencies of light, we perceive a particular color.
Additive color mixing involves combining different colored lights to create new colors. For example, red, green, and blue lights can be combined to create white light. Subtractive color mixing, on the other hand, involves mixing pigments or dyes to create new colors. When pigments or dyes are mixed, the resulting color is determined by the wavelengths of light that are absorbed or reflected.
The color of an object that we see is determined by the wavelengths of light that are reflected off of its surface. For example, a red apple appears red because it reflects mostly red light while absorbing other wavelengths. The color of an object can also be affected by the color of the light that is shining on it.
Color frequencies determine the specific color that we perceive. Different frequencies correspond to different colors on the visible light spectrum. For example, low frequencies correspond to red and high frequencies correspond to violet. Our perception of color is also affected by the intensity or brightness of the frequencies present.