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What's stored first, the raw image or the jpeg sidecar file ?

Discussion in 'General Equipment Chat & Advice' started by mediaman, Jan 2, 2019.

  1. Roger Hicks

    Roger Hicks Well-Known Member

    Dear Pete,

    This certainly seems extremely likely. I was (like several on here, I think) conflating which file is created first, and which is written first.


  2. El_Sid

    El_Sid Well-Known Member

    On those occasions when I take JPEGs rather than raw I find that it takes less time to process and save a JPEG than to simply save a raw file. The reason for this I suspect is that the JPEG is only 8 bit rather than 12 or 14 bit and therefore a lot smaller. The write procedure is the rate limiting step as it is far slower than the actual data processing step(s) - the time taken to write a file to is far in excess of the time it takes to actually process the image....
  3. cliveva

    cliveva Well-Known Member

    The RaW is what the Jepeg is created from, and could be saved first, but only the manufacturer could tell you!!!
  4. daft_biker

    daft_biker Action Man!

    Unless someone knows of a debugging tool which can trace the steps..... or copies the firmware off their camera and runs it through a decompiler to generate some hopefully readable source code.

    The manufacturer probably already has is documented somewhere and some techie will know what he/she did but I doubt the customer facing support staff will be able to tell us.
    Andrew Flannigan likes this.
  5. Andrew Flannigan

    Andrew Flannigan Well-Known Member

    ^^^^^^ what Andrew said.
  6. Benchista

    Benchista Which Tyler

    I don't really see why which is saved first matters - it's clear that the RAW files is created first, because that's what a RAW file actually is - a JPEG is always crreated from raw data, even on cameras that can't save RAW files.
    Last edited: Jan 7, 2019
    Andrew Flannigan likes this.

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