computer science quiz 2

Pixel

The smallest programmable unit of color on the screen

What data does a pixel contain

It contains numerical values representing color intensity, specifically RBG values (Red, green, and blue)

How is data for a pixel stored

Pixel data is stored digitally as binary numbers representing intensity

In standard systems, each of the three is stored as an integer value ranging from 0 to 255

Additive color (light/screens)

Starts with black (absence of light) and add light wavelengths together (red green and blue). Combining all three at maximum intensity produces white

Subtractive color (pain and pigments/print)

starts with white surface that reflects light and uses pigments to absorb (subtract) light wavelengths so only certain colors bounce back to your eyes

What is resolution and how is it calculated?

Definition: the level of detail in an image, determined by the total number of pixels it contains

Calculation: it is calculated exactly like the area of a rectangle. You multiply the number of pixels in the width by the number of pixels in the height

How do you get specific values from pixels in an image?

You access specific values by using programming commands (such as the “item of”’ block or table/list lookups to retrieve the row or coordinate corresponding to a specific pixel, which reports its list of RGB values