Practice question · True or false
A raw file is an image that simply has not been compressed yet.
Hints
- Ask how many colour values per pixel a raw file actually contains.
- Something still has to decide what colour each pixel is.
Show the answer
False
Why
False. A raw file is a set of single-colour measurements plus metadata, not an image: it has not been demosaiced, white balanced or tone mapped. That is why two converters produce visibly different pictures from the identical file, and why "the raw file" is not a picture anyone has ever seen.
Practise Digital Capture and the Input-Output Chain
The app has 5 more questions on this lesson, and keeps your place in the course. Photography I is free to start.
More questions on Digital Capture and the Input-Output Chain
- Sort each step by where it sits in the input-output chain.
- Half the photosites under a Bayer array carry a green filter and each photosite measures only one colour, yet…
- A Bayer colour filter array carries twice as many green filters as red or blue.
- A 24-megapixel sensor records 14 bits at every photosite. How large is one uncompressed raw file, in…
- Complete the account of digital capture.
- Which are true of bit depth and linear encoding?
- A 6000 by 4000 pixel file is printed at 300 pixels per inch. How wide is the print, in inches?
- Sensor data is recorded linearly, whereas human vision perceives brightness logarithmically. Why does this…