Data Representation - Storing Images (GCSE Computing)

The following is a GCSE Computing test covering 'Data Representation - Storing Images'

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Question 1

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Which of the following is true about RAW image files from digital cameras?

If you double both the width and height of an image, what happens to the total number of pixels?

Why might someone use lossless compression for an image?

Which of the following statements about DPI (dots per inch) is correct for on-screen images?

If an image uses indexed colour with a palette of 256 colours, how many bits per pixel are required?

Which of the following is a reason to reduce image resolution before uploading to a website?

What is metadata in the context of image files?

What effect does adding an alpha channel to a 24-bit image have on bits per pixel?

An image with dimensions 1600×1200 uses 32 bits per pixel. What is the uncompressed file size in megabytes (MB)?

Which statement best describes GIF image format limitations?

What is the purpose of a colour palette in indexed images?

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