Digital Images and Colour Depth Quiz

What does the resolution of an image refer to?

• The number of pixels in an image

• The number of colours in an image

• The size of the file in megabytes

• The speed of image processing

What does colour depth represent in a digital image?

• The number of binary digits used to represent the colour of each pixel

• The number of pixels in an image

• The size of the image file

• The brightness of the image

How do you calculate the total number of bits needed to represent an image?

• Resolution × Colour Depth

• Resolution + Colour Depth

• Resolution ÷ Colour Depth

• Resolution - Colour Depth

If an image has a resolution of 100×100 and a 3-bit colour depth, how many bits are needed to represent the image?

• 30,000 bits

• 10,000 bits

• 300 bits

• 3,000 bits

How many kilobytes are in 2,359,296 bytes?

• 2,359.3 KB

• 23,593 KB

• 235.93 KB

• 23.59 KB

What does 8 bits per channel mean in RGB colour?

• Each R, G, and B value ranges from 0 to 255

• There are only 8 colours possible

• Each pixel is 8 bits in total

• Each channel is 8 pixels wide

What is a common misconception about 3-bit colour?

• That it gives only 3 colours, when it actually gives 8

• That it gives 8 colours, when it actually gives 3

• That it gives 16 colours, when it actually gives 8

• That it gives 256 colours, when it actually gives 8

What is the formula for calculating the total size of an image file in bits?

• Width in pixels × Height in pixels × Colour depth in bits

• Width in pixels + Height in pixels + Colour depth in bits

• Width in pixels ÷ Height in pixels × Colour depth in bits

• Width in pixels × Height in pixels ÷ Colour depth in bits

What is the next step after converting bits to bytes when calculating file size?

• Convert bytes to kilobytes

• Convert bytes to bits

• Convert bytes to pixels

• Convert bytes to colours

How do you convert bytes to kilobytes?

• Divide by 1000

• Multiply by 1000

• Divide by 8

• Multiply by 8