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Comp Sci 1033 > Lecture 3 - Intro to Graphics > Flashcards

Lecture 3 - Intro to Graphics Flashcards

1
Q

What three aspects do we rely on images for?

A
  1. Information
  2. Explanations
  3. Entertainment
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2
Q

What do computers understand or “speak”?

A

Binary - series of 0’s and 1’s

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3
Q

What is Digitization?

A

The process of translating a piece of information into Binary Bits

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4
Q

What does 1 bit represent?

A

A max of 2 values.

  • black and white
  • true and false
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5
Q

What does 2 bits represent?

A

A max of 4 values

  • black, dark grey, light grey and white
  • red, blue, yellow and black
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6
Q

What does 3 bits represent?

A

A max of 8 values

  • days of the week
  • shades of grey
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7
Q

If a pixel color is represented by 1 bit then,
Value 0 =

Value 1 =

A

Value 0 = Black

Value 1 = White

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8
Q

How many colours can 2 bits allow for?

A

4 colours

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9
Q

How many colours can 4 bits represent?

A

2^4 therefore 16

More bits, means more colours available to assign to a pixel

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10
Q

How many colors are 6 bits?

A

64 possible colours

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11
Q

How many colors are 8 bits?

A

256 possible colours (think Crayon boxes)

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12
Q

How many colors are 24 bits?

A

Approximately 16 million possible colors

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13
Q

What is Sampling?

A

How many parts (pixels) will I break the image up into?

The more samples taken, the clearer the picture becomes

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14
Q

What color model is used for the web?

A

Additive Model (RGB)

The primary colors are Red, Green and Blue

Adding light to a black background in order to obtain color shades, it is brighter than CMYK

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15
Q

What color model is used for printing?

A

Subtractive Model (CMYK)

Primary colors are Cyan, Magenta and Yellow

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16
Q

What bit representation does “True Color” use?

A

24 bits which is approximately 16 million colors

Need 3 bytes for True Color

17
Q

RGB Notation

A

Each pixel is represented by 3 values

Each value ranges from 0 to 255

Example: Light Yellow is 255, 255, 127

18
Q

In RGB Notation, what are the colors Red, Green, Blue, White and Black?

A

Red: <255,0,0>

Green: <0,255,0>

Blue: <0,0,255>

White: <255,255,255>

Black: <0,0,0>

19
Q

In Hexadecimal Notation, what are the colors Red, Green, Blue, Black, White, Dark Grey and Light Grey?

A 
Red: #FF0000
Green: #00FF00
Blue: #0000FF
Black: #000000
White: #FFFFFF
Dark Grey: #222222
Light Grey: #CCCCCC

Case is insignificant when writing hexadecimal notation

20
Q

Can you convert RGB to hexadecimal or vice versa?

A

YES

21
Q

Approximately how many colors can the human eye detect?

A

10 million

22
Q

How does being a Bitmap graphic or Vector graphic affect the display in a computer screen?

A
  1. Quality
  2. File Size
  3. Time to display the graphic
23
Q

Bitmap Graphics (Raster)

A

Made up of pixels

Editing pixels = changing colors

Bitmapped images come from scanners and cameras etc

24
Q

Interpolation

A

The computer adds new pixels and guesses on the color to color the new pixels based on the surrounding pixels

Quality decreases

File size increases

25
Q

Vector Graphics

A

The image is represented with lines and arcs that have a mathematical relationship

Doesn’t matter what the size is, doesn’t affect quality. May increase file size if the image is larger…

26
Q

Is a vector-based image smaller than a bitmap image?

A

YES, and will download faster due to .svg format

27
Q

What do Vector images look like?

A

Clip Art

28
Q

What are Bitmap file endings?

A

.jpg
.gif
.png

Always Bitmap

29
Q

Can you convert a Vector image to Bitmap?

A

Yes, bring it into a paint program

30
Q

Can you convert a Bitmap to Vector?

A

NO

31
Q

What affects image quality?

A
  1. Image resolution

2. Image Bit Depth

32
Q

For image resolution, what should the ppi be set to for the web?

A

72 ppi

Lower resolution, smaller file size, faster download time

33
Q

For image resolution, what should the ppi be for printing?

A

300 ppi or more

Higher resolution means bigger file size

34
Q

What programs are used for Vector images?

A

Illustration Programs like Adobe Illustrator or Macromedia Freehand

35
Q

What programs are used for Bitmap images?

A

Photo/Image Editors like Photoshop and Paint

Comp Sci 1033 (11 decks)

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