Which three color channels are used in a color image?

• A. Red, green, and yellow
• B. Red, green, and blue
• C. Cyan, magenta, and black
• D. Red, yellow, and blue

Answer: (B)

The correct answer highlights the foundational color model used in digital imaging, known as the RGB color model. In this model, colors are created through the combination of three primary colors: red, green, and blue. Each color channel can have a value that typically ranges from 0 to 255 in digital representations, allowing for the creation of millions of colors through various combinations of these three channels.

When red, green, and blue light are combined in different intensities, they produce a wide spectrum of colors perceived by the human eye. For instance, combining all three at full intensity yields white light, while the absence of all three results in black.

The other options reference different color models or combinations that are not applicable to the RGB color space used for digital images. For example, cyan, magenta, and black describe the CMYK model typically used in color printing, while the mix of red, yellow, and blue refers to traditional color theory often discussed in art, which does not align with the RGB digital standard. The inclusion of yellow as a primary color in the other options does not apply to the typical RGB framework used in most digital systems today.