Representing images: pixels and bitmaps

9.Increasing the resolution of a bitmap image always increases the file size.

10.Which of the following are lossless compression algorithms? (Select all that apply)

11.Match each term to its correct definition.

12.Arrange the following steps in the order they occur when a bitmap image is displayed on a screen.

13.A raster image with a higher resolution always has a larger file size than one with a lower resolution, regardless of compression.

14.Lossy compression algorithms can perfectly reconstruct the original image from the compressed data.

15.Which of the following best explains why a photograph is more suitable for raster graphics than vector graphics?

16.Put the following steps in the order they occur when a bitmap image is displayed on a screen.

17.Which of the following are common raster image file formats? (Select all that apply)

18.A bitmap image with a color depth of 4 bits per pixel can display up to 16 different colors.

19.Which of the following best explains why run-length encoding (RLE) is often more efficient for line drawings than for photographs?

20.The word 'raster' comes from the Latin word for 'rake'.

21.Which of the following statements about lossy compression are true? (Select all that apply)

22.A bitmap image is 8 pixels wide and 8 pixels high. If it uses 1 bit per pixel, how many bits are needed to store the image without compression?

23.A photograph is stored as a 24-bit bitmap with resolution 1920 × 1080. What is the uncompressed file size in megabytes (MB) if 1 MB = 1,048,576 bytes?

24.A bitmap image with a color depth of 8 bits per pixel can display 256 distinct colors.

25.Which of the following factors directly affect the file size of an uncompressed bitmap image? (Select all that apply)

26.Run-length encoding (RLE) is always more efficient than storing the original pixel values for any bitmap image.

27.A bitmap image is 10 pixels wide and 10 pixels high, with a color depth of 4 bits per pixel. It is compressed using run-length encoding. The first row of pixels has the values: 5, 5, 5, 5, 5, 5, 5, 5, 5, 5. How many bits would be needed to store this row using RLE, assuming each value and count is stored as a 4-bit number?

28.In a row-major format, the cells of the image are stored starting from the bottom row and moving upward.

29.Which of the following best describes the purpose of the header in a raster image file?

30.In a raster image, the size of each pixel is constant across the grid.

31.Arrange the following steps in the correct order for storing a raster image in a file using row-major format.

32.A raster image has a color depth of 4 bits per pixel and a resolution of 1024 × 768. It is compressed using run-length encoding. The image consists entirely of a single solid color. What is the compressed file size in bytes, assuming the header is negligible and each run is stored as two bytes?

33.The word 'raster' originates from the Latin word 'rastrum', meaning a rake.

34.In a raster image, the size of each pixel can vary across the grid.

35.In a row-major format, the cells of a raster image are listed starting from the bottom row and moving upward.

36.Which of the following are characteristics of raster images? (Select all that apply)

37.A raster image with a color depth of 4 bits per pixel can display up to 16 different colors.

38.In a raster image, the header section at the beginning of the file must contain at least the number of columns and the pixel datatype.

39.Put the following steps in the correct order when storing a bitmap image in a file using row-major format.

40.Which of the following are common raster compression algorithms? (Select all that apply)

41.Complete the sentence.

42.Fill in the blank.

43.How many distinct colors can be represented with 8 bits per pixel?

44.What is the main advantage of using raster graphics for photographs compared to vector graphics?

45.A bitmap image is 10 pixels wide and 10 pixels high, with a color depth of 4 bits per pixel. How many bits are needed to store the image without compression?

46.A 24-bit bitmap image has a resolution of 1920 × 1080 pixels. Calculate the uncompressed file size in bytes.

47.An image has a resolution of 800 pixels wide and 600 pixels high, with a color depth of 16 bits per pixel. How many bits are needed to store this image without compression?

48.What is the term for the process of converting a raster image to a vector image?

49.A bitmap image has a resolution of 100 pixels wide and 100 pixels high, and uses 8-bit color depth. Calculate the uncompressed file size in bytes.

50.Complete the sentence:

51.A bitmap image has a resolution of 200 pixels wide and 150 pixels high, with a color depth of 16 bits per pixel. What is the uncompressed file size in bytes?

52.A bitmap image is 20 pixels wide and 15 pixels high. How many pixels does it contain in total?

53.Explain why increasing the color depth of an image from 8-bit to 24-bit increases the file size, and give an example calculation.

54.Explain why increasing the resolution of a bitmap image from 100x100 to 200x200 will increase the file size, and calculate the factor by which the number of pixels increases.

55.Explain why a photograph stored as a bitmap with a color depth of 24 bits and high resolution will have a much larger file size than a simple line drawing stored with the same resolution but a color depth of 1 bit. Use calculations to support your answer.

56.Explain why increasing the resolution of a bitmap image from 100×100 to 200×200 will increase the file size, and calculate the factor by which the number of pixels increases.

57.Explain why run-length encoding (RLE) can be up to twice the size of the original file for a photograph, but very efficient for a line drawing.

58.How many distinct colors can be represented with 8 bits per pixel?

59.A bitmap image is 10 pixels wide and 10 pixels high, with a color depth of 4 bits per pixel. How many bits are needed to store the image without compression?

60.A 24-bit bitmap image has a resolution of 1920 × 1080 pixels. Calculate the uncompressed file size in bytes.

61.An image has a resolution of 800 pixels wide and 600 pixels high, with a color depth of 16 bits per pixel. How many bits are needed to store this image without compression?

62.A bitmap image has a resolution of 200 pixels wide and 150 pixels high, with a color depth of 16 bits per pixel. What is the uncompressed file size in bytes?

63.A bitmap image is 20 pixels wide and 15 pixels high. How many pixels does it contain in total?