iGCSE Computer Science: Digital Image Representation

Pixels get their colour from a combination of which colours?

• cyan magenta yellow black

• red green blue

• primary colours

• black white

Which factors affect the file size of a bitmap image? (select all that apply)

• pixel density

• image dimensions

• colour depth

• software used to create it

• format of image meta-data

If an image has a colour depth of 8 bits then the number of possible colour shades is ... ?

• 256

• 8

• 16

• 2014

If an image has a colour depth of 65,536 colours, then the number of bits used to represent each pixel is ...

• 64

• 10

• 8

• 16

The True Color bitmap standard uses 24 bits to represent every pixel. How many possible colour shades does this allow?

• 16,777,216

• 65,536

• 24

• 48

Which of these image file formats involves lossy compression?

• .gif

• .png

• .jpg

• .bmp

Which of these image file formats involves lossless compression? (select all that apply)

• .gif

• .png

• .jpg

• .bmp

Which image file format is uncompressed?

• .bmp

• .png

• .jpg

• .gif

The density of pixels in an image is measured by ...?

• pixels per inch

• dots per cm

• pixels per cm

• width * height

What is the correct term for the amount of pixels that make up a digital image?

• pixellation

• resolution

• resolvation

• density