Representing Images (OCR GCSE Computer Science): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is a pixel?
What is a pixel?
The smallest unit of an image
What does colour depth measure?
What does colour depth measure?
The number of bits per pixel
How many colours can be represented with a colour depth of 2 bits?
How many colours can be represented with a colour depth of 2 bits?
4 colours
How many colours can be stored using 8 bits per pixel?
How many colours can be stored using 8 bits per pixel?
256 colours
What unit is often used to measure image resolution?
What unit is often used to measure image resolution?
Dots per inch (DPI)
What is the effect of a higher DPI?
What is the effect of a higher DPI?
More pixels, sharper image
Which of these is NOT typically included in image metadata?
Which of these is NOT typically included in image metadata?
Internet download speed
What happens with larger colour depth and higher resolution?
What happens with larger colour depth and higher resolution?
Higher quality, larger file size
What formula calculates image file size?
What formula calculates image file size?
Size = Resolution × Colour Depth
How many bits are in 1 byte?
How many bits are in 1 byte?
8 bits
How many bytes are in 1 megabyte (MB)?
How many bytes are in 1 megabyte (MB)?
1,000,000 bytes
What is the file size of pixels at 8 bits per pixel in bytes?
What is the file size of pixels at 8 bits per pixel in bytes?
250,000 bytes