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Laser Theater Red/Green Light Show Projector Party Effect - Brand New |  |
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Laser Effects Projector With Red And Green Lights | |
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Disco 400mW Blue 450nm Red RB Firefly Effect Show Laser Light System Projector | |
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Effects Projector Red
Light from projectors?
If you take a ruler and wave it in front of a projector (that is turned on and preferably projecting a white screen, such as a blank notepad document) it creates a pattern of a red version, a blue version, a green version, and a normal version of the image. Originally my physics teacher and I assumed it was just the cones in our eyes reacting at different speeds to different colors of the light, but then when I took a picture of it the same effect occurred. So now my question is why and how does this happen? Here is one of the pictures to help you better visualize it: http://blackgalaxy.tv/images/ruler.jpg
(the differently colored area on the left is where the ruler began to pass a second time so the colors overlapped and mixed)
Even if you don't know the answer I would appreciate any ideas you may have. Thanks!
Another note: We were using an epson projector connected to a computer
If I understand you correctly, the phenomenon you observed is due to the white light you see on the screen actually being projected as a combination of the red, green and blue color combinations that make up the full color image.
On a modern day TV, the tv has color "cells" made up of 3 smaller segments made of red,green, and blue transparent cells. The full color image you see is actually 3 images superimposed( one on top of the other) in rapid succession( one after the other ,all within a fraction of a second of each other)
When you waved the ruler in front of the projector, you created the same effect as watching a tv while a fan is in front of the screen. As the blades pass in front of the screen, they only permit you to see a section of the picture at a time, and that might be the red part, or the green part, or the blue part. Because your eyes see images in real time, and not in the "strobe" light fashion caused by distrupting the image , your brain combines the 3 colors to come up with a color image with all the shades in the rainbow, based on how intense a particular shade is in the picture. ( Look really close at a magazine picture... see all the different colored dots that make up the larger image? It's alot like your projector .)
Now imagine that magazine picture being displayed many times per second, first with all the red parts, then with all the blue parts, and so on. When you just look at the picture, your brain puts all the colors together. When you disrupt the image by waving the ruler, you only allow a certain color to get to the screen( red, blue or green) and that's what your eye sees, and sends that to your brain.
Hope this helps. ( Part of this phenomenom is called spectral discrimination, or color seeing) The other part is called kinetiscopic segmentation, or the breaking up of a moving picture into it's component parts. ( A movie is really just a series of still photos, with the image moving slightly between each still. When we display each consecutive image, our brain puts the pictures together in such a way as we say it is moving.)A TV picture is similar, except that only half the image is "drawn" at a time, and the other part is drawn in the space between the lines last drawn... ask your teacher for more details.
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Laser Theater Red/Green Light Show Projector Party Effect - Brand New | |
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US $157.32 | 26d 19h 27m |
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Laser Effects Projector With Red And Green Lights | |
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US $98.99 | 24d 14h 45m |
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Mini Green&Red Laser Effects Projector Sound Activation | |
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US $135.99 | 15d 8h 12m |
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Laser Theater Show Projector Party Effect - Red & Green | |
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US $159.99 | 11d 13h 16m |
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Disco 400mW Blue 450nm Red RB Firefly Effect Show Laser Light System Projector | |
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US $298.80 | 2d 7h 9m |
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No items matching your keywords were found.
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Mini Green & Red Lights Sound Activation Starry Effects Laser Star Stage Lighting Projector
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DescriptionIt features a mini laser stage light emits both Green and Red laser lighting. |
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Mini Green & Red Lights Sound Activation Starry Effects Laser Star Stage Lighting Projector
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Extreme Lasers :: Green Moon Flower Laser Light Show Projector
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DescriptionExperience TV programs, movies, games, and other video content with a 3D stereoscopic effect when you combine your compatible Mitsubishi HDTV with this 3D Starter Pack, which includes everything you need to start watching 3D video at home... |
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Mini Sound Activation Starry Effects Laser Star Projector
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The Mighty Mini Laser - Portable Laser Show
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Lava World 2552 USB Mini Lava Lamp ( Blue )
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DescriptionWhether you're gaming over night or just relaxing and web surfing, this USB Mini Lava Light will lighten your desktop. Just plug it into your USB port for power and this little desktop Glitter Lamp will be filled with clear lava and a lots of glitter flakes... |
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Red & Green Mini Laser Stage Lighting Projector
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DescriptionDescription 100% Satisfaction; Fast Shipment with UPS Ground? Animated moving green and red star |
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Crayola Color Explosion Glow Board
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Description.caption { font-family: Verdana, Helvetica neue, Arial, serif; font-size: 10px; font-weight: bold; font-style: italic; } ul.indent { list-style: inside disc; text-indent: -15px; } With the Crayola Color Explosion Glow Board, kids can take their creations to a whole new level of fun... |
$ 46-US, Laser Effects Projector With Red And Green Lights, 1st Shopping Channel
Purchasing A Slide Projector Part One
With so many slide projector manufacturers, and types of slide projectors to choose from, selecting the right one for you may seem like an impossible task, but it does not have to be. With some research, a little know how, and the help of this comprehensive article, you can have the confidence in knowing you are purchasing a slide projector that is right for you.
Most slide projectors on the market today feature one of two main projection technologies LCD and DLP. LCD stands for Liquid Crystal Display, and is the oldest and most widely used projector technology. With this type of projector, three LCD panels located inside the projector separate the color spectrum into red, green, and blue, and the passes through these panels to form the image on the screen.
With LCD technology, there is generally better color saturation, meaning that the colors are more vibrant and crisp. The images and data re typically more detailed with an LCD projector as opposed to a DLP as well, but it should be noted that DLP is a relatively new technology that is constantly being improved upon and updated.
DLP stands for Digital Light Processing, and is a newer technology that reflects the light of the projector lamp off of thousands of tiny spinning mirrors and also, through a color wheel, which produces the image shown on the screen. DLP is a proprietary technology developed by Texas Instruments.
With DLP technology, there are generally less pixels available, making DLP the better choice for video projection, which is the reason that many home theater enthusiasts prefer DLP over LCD. DLP technology is also capable of producing higher contrast ratios than the average LCD projector. Contrast ratio is a term used to describe the measurement of black on black levels on video.
The main weakness that has been observed with DLP technology is the tendency of these spinning color wheel projectors to produce an artifact on the screen which is commonly known as the rainbow effect. Not everyone, however, can see this effect, and with technological improvements and todays line of six segmented color wheel DLP projectors, this problem is steadily decreasing.
LCOS stands for Alternative Liquid Crystal on Silicon, and is a very high resolution and typically higher priced type of projector than the average LCD and DLP products. LCOS projectors use three LCOS chips, one to modulate red, green, and blue light channels. There is no spinning color wheel, and no rainbow effects or visible pixels due to the extremely high, i.e. SXGA 1365x1024 and above resolution class.
The disadvantages to LCOS technology are a lower contrast ratio, and limited lamp life, but if you require the highest resolution, than this type of projector may be the right choice for you.
Now that you know about the different types of projector technologies available, the next step is to determine your projector use needs.
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