pygame.event.get(let_us_just_go_ahead_and_end_this_irrelevant_to_pygame_discussion_now_Please)
On Tue, Mar 20, 2012 at 12:09 PM, Christopher Night <cosmologi...@gmail.com>wrote: > On Tue, Mar 20, 2012 at 12:57 AM, Greg Ewing > <greg.ew...@canterbury.ac.nz>wrote: > >> Christopher Night wrote: >> >>> The idea is that if we could independently stimulate each of the three >>> colors receptors (cones) in our eyes, then we could reproduce any visual >>> sensation and thereby any color. The problem is ... there's no such thing >>> as a wavelength of light that stimulates the middle (green) cones without >>> also stimulating either of the outer two. >>> >> >> But that means we never experience the sensation of >> having just the green cones stimulated, so there is >> no need to reproduce it. >> >> Unfortunately that's not the case. Here's a simplified example to show > the problem. Consider four variables red, yellow, green and blue, > representing the intensity of four different wavelengths of monochromatic > light. Any of them can have any positive value. Say the amount of > stimulation each cone receives is: > > LOW = 1 x red + 0.5 x yellow + 0.2 x green > MEDIUM = 0.2 x red + 0.5 x yellow + 1 x green + 0.2 x blue > HIGH = 0.2 x green + 1 x blue > > Now, the question is, how can you reproduce the response you get with > yellow light, with just red, green, and blue? Yellow stimulates the low and > medium cones with equal intensity, and the high cone not at all. So if > (red, yellow, green, blue) = (0, 1, 0, 0), then (LOW, MEDIUM, HIGH) = (0.5, > 0.5, 0). Using only red, green, and blue, the only way to get LOW = MEDIUM > is to use equal parts red and green. But if green > 0, then HIGH > 0. > > Of course you might say, maybe a different set of three wavelengths would > be able to produce the same response as any monochromatic light. And some > sets do better than others. But as I understand it, no set of three is > perfect. (Also, these are obviously completely made-up numbers.) > > -Christopher > -- Joseph M. Halvarson 612-875-2593
