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Images captured with a digital cameras are created by reading and recording the light .
A digital camera translates light into color using receptors which correspond to the : red , green, and blue color . Why Red , Green and blue ? because the light can be broken into variation of these colors .
Each receptor measures the brightness of the light for its particular range.
To understand this effect you use three LEDs ( lighting emmiting diodes ) with red , green and blue colors in a darkened camera . If you will mix the light of these three colors you will observe that when all Leds will light in the same point the resulted color is white . If the intensity of the light is not the same for all Leds you will obtain a variation of colors .
Like human eye the camera computes the brightness level to obtain colors and images .
Other devices like computer monitors, television sets, digital projectors and scanners also create images by combining red, green, and blue colors .
The brightness values for each color is stored in separate portions of the image file.
Using a photo editing software we can view and edit the individual color channels from any image or photo .
Another color model is CMY/CMYK used in general in other devices which don’t use light to create images (mix of red , green and blue color ) . The CMY / CMYK color is used in printers , ink printers which mix Cyan , Magenta and Yellow ink colors to create images .
Because inks are not pure colors is hard to produce a true black color mixing just cyan, magenta, and yellow , so most photo printers use an additional color black ( black ink ) .is difficult.
This color model is called CMYK (the K is used to represent black ) .
There are many other format of colors like : sRGB , PMS .
If we look at one photo in the RGB format and the same photo in the CMYK format we don’t see a big difference but in reality the RGB colors are much more “strong “ .
sRGB is a variation of the RGB color format with a smaller range of colors than RGB . This color format was designed to improve color matching between on-screen and printed images because the RGB use more colors to create an image than printers can reproduce .
In fact the sRGB format is a standard for RGB colors used in on screen monitors . The s letter from sRGB is a stands for standard .
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