-science/aqa/questions","basePath":"/gcse/computer-science/aqa/representing-images/questions","formulaUrl":null,"initialIndex":28,"initialQuestionWindow":[{"id":"b0e5cd4a-0f52-4918-8e42-983c789ca1a0","revisionId":"292657f4-caec-4581-ae04-00252380b566","questionNumber":null,"questionType":"LA","specification":"An engineer designs a custom telemetry display for a nuclear reactor core, represented as a bitmap image. The status display (Grid T) is shown below:\n\n![Telemetry sensor display of Grid T, measuring 40 pixels wide by 32 pixels high, using exactly eight distinct colors.](https://assets.mathsgenie.co.uk/aqa-qb/08da9368-15bf-4603-a0dc-d8b1753c98e9.png)","difficulty":5,"difficultyBand":"easy","totalMarks":2,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"885df07a-51b0-48b7-a2db-2c60aceb5941","label":null,"content":"Calculate the minimum amount of storage required to store the raw image data for Grid T.\n\nGive your answer in **bytes**.\n\nShow your working.","markscheme":"- Shows a correct method to find the total bits by multiplying the total number of pixels ($40 \\times 32 = 1280$) by the minimum bit depth of $3$ bits per pixel (for $8$ distinct colors, since $2^3 = 8$), yielding $3840$ bits M1\n- Converts total bits to bytes by dividing by $8$ to find the final correct size of $480$ bytes A1","marks":2,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"b744f088-530c-4d6a-a923-3c9fc1f0f082","revisionId":"db98ea84-645e-4fe3-abf6-55f34608d360","questionNumber":null,"questionType":"LA","specification":"A digital display on a retro-style synthesizer has a screen resolution of 80 pixels by 120 pixels. The user interface utilizes 50 unique colours to represent different waveform stages.","difficulty":5,"difficultyBand":"easy","totalMarks":2,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"2c8b93ad-22ca-4225-a5e0-a34bdeacc3de","label":null,"content":"Calculate the minimum file size, in bits, of a single full-screen interface image when represented as an uncompressed bitmap.\n\nYou should show your working.","markscheme":"- Determines that $6$ bits per pixel (color depth) are required to represent $50$ distinct colours, since $2^5 = 32 < 50 \\le 64 = 2^6$ M1\n- Calculates the total number of pixels as $80 \\times 120 = 9600$ and finds the minimum file size to be $9600 \\times 6 = 57,600$ bits A1","marks":2,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"b9e6c447-ca40-4ed7-9c54-245ea5671781","revisionId":"e110bf05-2247-4bd8-8e7a-bdb544121f35","questionNumber":null,"questionType":"LA","specification":"Digital image files contain more than just the binary pixel data; they also store metadata.","difficulty":2,"difficultyBand":"easy","totalMarks":1,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"05f74367-f5a5-4444-a034-cdac95621f7a","label":null,"content":"Define the term **metadata** in the context of digital files.","markscheme":"- Defines metadata as \"data about data\" or information about a file (such as its dimensions, color depth, resolution, or creation date) rather than the actual pixel/image data itself B1","marks":1,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null}],"subjectCode":"gcse_computer_science__aqa","summaries":[{"id":"0bd2fef1-a351-454d-a85b-4337cccce1cc","difficultyBand":"easy","calculatorUse":null},{"id":"0cee8044-bdb7-4299-87ef-e59dfe24e568","difficultyBand":"medium","calculatorUse":null},{"id":"0d6ec132-28d7-40de-b64e-8cd02251b781","difficultyBand":"easy","calculatorUse":null},{"id":"0dcc247f-b8a5-470d-94a2-f2ee1fed2562","difficultyBand":"easy","calculatorUse":null},{"id":"0df6aa91-0fd8-40c3-83bc-3633202b837a","difficultyBand":"easy","calculatorUse":null},{"id":"1dcc17d4-c215-4d99-b404-3d6c5cea2252","difficultyBand":"easy","calculatorUse":null},{"id":"1ef5635f-eebe-

Representing images

Question 19

Representing images Questions

Representing images

Question 19

Representing images Questions