Images are being created to advertise holidays. Some of the images are bitmap images and some are vector graphics. (a) Complete the table by defining the image terms. Term Definition ------ ------------ Drawing list Pixel Colour depth (b) The bitmap images are photographs of the holiday locations. (i) Colour depth and image resolution are both included in the file header of a bitmap image. Identify two other items that could be included in the file header of each photograph.…

Computer Science 9618/11 — May/June 2023

Cambridge AS Level · Theory Fundamentals · worked solutions for every part, with the mark scheme

questions

marks

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Topics Information Representation · Processor Fundamentals · Hardware · Databases · Security, Privacy and Data Integrity · System Software · +2 more

Q1Information RepresentationFree sample

Images are being created to advertise holidays.

Some of the images are bitmap images and some are vector graphics.

(a)

Complete the table by defining the image terms.

(b)

The bitmap images are photographs of the holiday locations.

(i)

Colour depth and image resolution are both included in the file header of a bitmap image.

Identify two other items that could be included in the file header of each photograph.

1 ........................................................................................................................................

2 ........................................................................................................................................

(ii)

One of the photographs has a bit depth of 8 bytes and an image resolution of 1500 pixels wide and 3000 pixels high.

Calculate the file size of the photograph in megabytes. Show your working.

Working .............................................................................................................................

...........................................................................................................................................

File size ...........................MB

(c)

The photographs are compressed before they are uploaded to a web server. Customers download the photographs from this web server.

(i)

Explain the reasons why compressing the photographs will benefit the customers.

...........................................................................................................................................

.....................................................................................................................................

(ii)

An image can be compressed using run-length encoding (RLE).

Explain the reasons why RLE may not reduce the file size of a bitmap image. Give one example in your answer.

...........................................................................................................................................

.....................................................................................................................................

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