How to make awesome time-lapses from RAW photos

Discussion in 'Tips, Guides and Tutorials' started by Bezbod, Mar 2, 2017.

  1. Troy

    Troy Administrator Staff Member

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    Good observation @Sulev.
     
  2. Sulev Svilponis

    Sulev Svilponis Elite

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    It would be nice, if you test shoot something with a smooth brightness gradient. Like some matte (non reflective) spherical or rounded surface, that has no distinct pattern on it.

    I revised those purple spots, where ones step in into columns of leading zeros, and concluded, that those columns with trailing zeros should be actually also with leading zeros, instead of trailing zeros. As those spots are brightest spots on the image, and there should be relativeley smooth brightness gradient, this sample 12.5 x 10 pixel area should possibly be look like this:
    [​IMG]

    Explanations for those, who does not know much about bytes:
    08 + 1 bit = 09
    09 + 1 bit = 0A
    0A + 1 bit = 0B
    0F + 1 bit = 10
    10 +,1 bit = 11
    19 + 1 bit = 1A etc.
     
    Last edited: Sep 11, 2018
  3. Damian Holt

    Damian Holt Moderator

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    Sulev Svilponis likes this.
  4. Sulev Svilponis

    Sulev Svilponis Elite

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    Thanks, Damian!

    I examined those files and can confirm now, that in those raw files 25% of data is just a useless ballast, and some more information is lost/skewed. Right nibbles of bytes with trailing zeroes never change and always contain only zeros. Left nibbles of those bytes have distorted values (it looks like the trailing nibble of initial byte value is shifted to the leading position and the leading nibble is vanished/lost), causing changes in pixel data values for raw converters. Even raw2nef and raw2dng have problems with those files, because of distorted data. That's why these colors are so dull in converted raw files, especially the grass (greens).
     
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  5. Sulev Svilponis

    Sulev Svilponis Elite

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    Here are few samples of those conversions.
    First two raw images are converted with the raw2nef converter, no adjustments at all.
    [​IMG]
    Notice the pinkish hue in the upper right corner!

    [​IMG]
    Somewhat dull, but free of striking errors.

    The same pair converted with the SJCAM converter, also no adjustments at all.
    [​IMG]


    [​IMG]
    Pretty crazy coloring! Obviously wrong handling of pixel data!
     
    Last edited: Sep 12, 2018
  6. Damian Holt

    Damian Holt Moderator

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    @Troy can you pass this info back up the chain please. Personally I'm not bothered about raw however there's plenty that are. The camera has been advertised as being able to produce raw images but so far there's no way to use these images.
     
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