T6 Image

Question 1

What is DIGITAL IMAGE?

Answer 1

It is defined by image, width, height and pixel depth.

Question 2

Define image’s
width,
height and
bit depth.

Answer 2

No. of pixels
No. of lines
No. bits per pixels

Question 3

What are the 2 types of digital image?

Answer 3

Bitmap and vector

Question 4

Differentiate BITMAP and VECTOR images.

Answer 4

• Bitmap is PAINT graphic while Vector is DRAWN graphic.
• Bitmap is used for PHOTOREALISTIC image while Vector is created from GEOMETRIC objects.
• Bitmap image will be affected when it’s resized or rescaled but Vector is easily resizeable and rescalable
• Bitmap has LARGER memory space and LARGER file size, Vector is vice versa
• Bitmap can be displayed without plug-ins but Vector requires plug-ins for web-based displayed

Question 5

How do we convert Bitmap to Vector image?

Answer 5

Using autotraces

Question 6

What is the USAGE of Bitmap?

Answer 6

• photorealistic image
• complex drawing
• images that required fine details

Question 7

What is the USAGE of Vector?

Answer 7

• print media
• 3D animation programs
• CAD programs

Question 8

What are the APPLICATIONS of Bitmap and Vector Images? Give an example.

Answer 8

• Bitmap creates NATURAL DIGITAL images, Vector creates COMPUTER GRAPHICS
• Bitmap uses painting application, Vector uses drawing, illustrator and 3D modeling application
• Bitmap (Adobe PHOTOSHOP), Vector (Adobe ILLUSTRATOR)

Question 9

What happens if more no. of bits is used?

Answer 9

• more colors can be represented
• more color depth (= more photorealistic)
• more time to process
• larger memory

Question 10

What are the 2 basic METHODS of making colors?

Answer 10

ADDICTIVE (projected color) and SUBTRACTIVE (printed color)

Question 11

State the 3 color models.

Answer 11

RGB, HSB and CMYK

Question 12

What is RGB color model?

Answer 12

• addictive method
• red, green and blue
• range from 0 (black) to 255 (white)

Question 13

What is HSB color model?

Answer 13

• hue, saturation and brightness
• based on human perception
• hue: color type (range 0 to 360)
• 0 is red, 120' is green and 240 is blue
• saturation: intensity (range 0% to 360%)
• 0% is white, gray or black and 100% is pure color
• brightness: % of black or white that is mixed with colot=r
• 0% is black, 50% is pure, 100% is white

Question 14

What is CMYK color model?

Answer 14

• subtractive method
• SECONDARY color
• cyan, magenta, yellow, black
• associate with printing
• concept: subtraction and reflection
• K (black) is usually ignored except if it’s needed to produce black in printing