1.2.4. Data Storage - representing images

Colour depth refers to:

• How many bits are used in a file to store colour information in every pixel
• Resolution divided by the number of colours in an image.
• Degree of file compression applied to an image file.
• Repeated resampling of an image.

The smallest unit of data stored in an image file is called:

• Pixels
• Resolution
• Alpha
• Bitmap.

How many colours can an image with a colour depth of 3 store?

• 2 colours

• 4 colours

• 8 colours

• 24 colours

How many colours can be displayed by an image with a colour depth of 2 bits?

• 2 colours

• 4 colours

• 8 colours

• 24 colours

The higher the resolution, the ____ the file size.

• Smaller
• Larger

What is the calculation to work out how many bytes a bitmap is?

• height * width * colour depth / 8

• height / width * colour depth / 8

• height - width + colour depth / 8

• height * width / colour depth / 8

Reducing the amount of colours in the image will

• Reduce the quality of the image.
• Reduce the amount of binary needed for each pixel.
• Make the file size larger
• Remove pixels from the image.

Which is NOT an example of metadata for an image file?

• Resolution
• Colour depth
• Camera used
• Sample rate

Additional Information about the image file is stored as

• Metadata
• Properties
• File summary
• Pixels

Which is NOT an effect of increasing the resolution in an image?

• More colours can be displayed.
• More binary will be required to create the image.
• Larger file size
• Higher quality image