I have gathered these from a few Internet resources – sorry I don’t have all the names for accreditation. If you need more practice try this spreadsheet or PDF from Madras

Calculate the sizes of the following files. Use the most appropriate units in your answer

Questions (Images)

1. 600 x 300 pixels, 24 bit colour depth
2. 600 x 400, 16 bit colour depth
3. 600 x 600, 24 bit colour depth
4. An image is 6 inches by 8 inches, and has a resolution of 1200 dpi. It has a bit depth of 20.
   1. How many colours can the image store?
   2. What will be the file size of the image?
5. A photograph measures 10 inches by 7 inches, and has a resolution of 400 dpi. The number of colours each pixel can store is 65536.
   1. What is the bit depth of the image?
   2. What will be the file size of the image?

Questions (Sound)

1. A stereo song has to be recorded at CD quality. The song is 2 minutes and 32 seconds long. What file size would the song have?
2. A stereo song has to be recorded at CD quality. The song is 4 minutes and 45 seconds long. What file size would the song have?
3. A 1 minute 15 second audio track is sampled in mono at 22.5KHz using an 8 bit sample rate. What file size would the track be?
4. A 32 second audio track is sampled in stereo at 22.5KHz using a 16 bit sample rate. What file size would the track be?

Question (Video)

1. A video is captured using 24fps and 600 x 400 pixels, colour depth 24 bits. What is the file size of the video if:
   1. it lasts 45 seconds
   2. it lasts 1 minute 22 seconds
   3. it lasts 3 minutes 50 seconds
2. Calculate the file size of a 8 minute video captured at 12fps, 800 x 600 with a colour depth 16 bits
3. Calculate the file size of a 35 second video captured at 24fps, 640 x 480 with a colour depth 24 bits
4. Calculate the file size of a 2 minute 15 second video captured at 25fps, 320 x 240 with a colour depth 16 bits