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What shows the brightness of the pixel in a digital signal processor?

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What shows the brightness of the pixel in a digital signal processor?

(a) luminance

(b) transparent

(c) chrominance

(d) opaque

I have been asked this question during an interview for a job.

This intriguing question comes from Types of Processors topic in portion Embedded Processors of Embedded Systems

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Right answer is (a) luminance

To elaborate: The color image of a digital signal processor have multiple channels. The brightness of the pixel is determined by luminance and the color of the pixel is determined by chrominance.

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