![]() ![]() ![]() Some people see these more easily than others, and some projectors tend to show them more easily. What you see then instead of white is a burst of red, green, and blue, otherwise known as a rainbow artifact. ![]() The potential problem with sequential color is that if the projector rotates through the color sequence too slowly in, say, a scene where James Bond walks across the room quickly while wearing a tuxedo and white shirt, the red, green, and blue elements of the shirt can fall on different parts of the retina. This is how single-chip projectors work, including the overwhelming majority of DLP models. If you rotate through the sequence repeatedly and quickly enough, your eye will integrate the colors over time. SpaceĪnother way to create color from three primaries is to show the red, green, and blue elements of the entire image separately, in sequence. (At this writing, the least expensive, currently produced three-chip model in our database is $27,526.) There are also palmtop and pocket laser projectors that produce colors this way, aiming red, green, and blue laser beams directly at the screen to paint the image dot by dot, one dot at a time. This approach-of putting small dots of three primary colors on the screen at once and letting your eye integrate the colors over space-is also how projectors with three imaging chips work, a group that includes most models that use LCD or LCoS imaging chips, and a few seriously expensive models that use DLP chips. Black is the absence of light created by turning pixels off. Your eye blends them together when viewed from a distance. Digital video displays, such as this LCD screen, have pixels comprised of separately addressable red, green, and blue subpixels that allow mixing of the primaries to create any color, including white. However, this is just a variation on how we see different colors in real world objects. You might think of this as tricking your eye into seeing a color that isn't there. Turn off the blue dot, for example, and your eye will see the red and green combination as yellow. Change the intensity of one or more of the primary colors and you'll see the combination as some other color. When you're too far away from the screen for your eye to resolve the individual dots, it integrates the three colors into the color you see, in this case white. Each set of red, green, and blue dots is a single pixel in the image. You'll see a repeating series of red, green, and blue rectangles-call them dots. If you launch a Windows or Mac program with a white background and use an 8x jeweler's loupe to look at your desktop or laptop screen up close, you won't see white. But keep in mind that some add other colors, which we'll get to a little later. We'll stay with the simplified version using just red, green, and blue for now, because that's what most displays do. To be precise, the gamut of colors you can produce depends on the choice of red, green, and blue you start with, and if the starting points won't let you create every possible color, you can expand the gamut by adding more colors, like yellow, cyan, and magenta. The concept of additive color allows that the three primary colors of red, green, and blue (for which the human eye has receptors) can be mixed to create all other visible colors, including white and the secondary colors magenta, cyan, and yellow. ![]() You only have to mix these three primary colors in the right proportions. Namely, if you're working with light, you need only three primary colors-red, green, and blue-to produce every color the human eye can see. So before we look at today's most common projection light sources-lamp, laser, and LED-and which might be best for your needs, let's start by talking about imaging.Īll color displays, including projectors, are built around a core observation of how the human visual system perceives color. The two interact in such a way that to fully understand your choices for the light source, you also have to know a little about the imaging technology it's paired with, and how imaging technologies work in general. At the heart of every projector are two essentials: the imaging technology and the light source. ![]()
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