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code.hs- digital information (3)
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Terms in this set (16)
What is data abstraction?
The process of simplifying complicated data into manageable chunks
Which of the following are examples of encoding information?
Representing fast food meals as numbers on the menu. For example a number 1 represents a hamburger. Assigning a numeric value to every area of a region, for example zip codes in the United States. Assigning a number to every character of the alphabet so we can represent sentences as series of simple digits.
In the binary value 1002, what is the place value of the 1?
4s place
What is the number base of the binary number system?
2
What is the value of 1310 in binary?
11012
How many bits are used to encode a character according to the ASCII encoding scheme?
8 bits (ex: 0100 0001 encodes 'A')
How many possible values can be created with only 2 bits?
4
What is a pixel?
A single tiny dot, or square, of color in a digital image.
What is the value of 9F16 in binary?
1001 11112
What is the value of F16 in decimal?
1510
What are the 3 color channels that make up a pixel according to the RGB color scheme?
Red, Green, and Blue
What is the range of values (expressed in decimal) that each color channel can have?
010 - 25510
Which of the following pixels has a color value of #ff0000 (expressed in hexadecimal)
(Red Pixel)
Which of the following instructions would brighten a pixel?Assume R is the red value of the pixel, G is the green value, and B is the blue value.
R = Math.min(R + 50, 255); G = Math.min(G + 50, 255); B = Math.min(B + 50, 255);
Which of the following functions properly removes all green and blue from a pixel and returns the modified pixel? var RED = 0; var GREEN = 1; var BLUE = 2
function removeGreenAndBlue(pixel) { pixel[GREEN] = 0; pixel[BLUE] = 0; return pixel; }
Which of the following describes the instructions for a general image filter? Given an image: for every (x, y) coordinate in the image
Get the current pixel at (x, y); Modify the pixel according to a function; Update image at (x, y) with this modified pixel
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