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Chronos 1.4 RAW conversion tool - pyraw2dng

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For those of you itching to shoot RAW on your Chronos, you can now use the raw saving feature in the latest beta software v0.2.5 along with this new conversion tool to make DNG sequences. This is a stopgap solution until we have DNG saving built into the camera.

pyraw2dng converts the .raw files saved by Chronos to standard Adobe DNG files.

The pyraw2dng utility is open source, you can view the source code on Github:


Python 2.7, available here:
This might work in Python 3 as well, but it has not been tested.

During the Windows Python 2.7 installation, ‘install’ "Add Python.exe to Path" as shown below:


Save your video using the RAW16bit format on the camera. Raw16RJ works, but the images are dark and need to be fixed in post. RAW12bit packed mode is not yet supported, but is coming soon.

Download the script (see attachment)

Copy the script file, and the raw 16 bit format video into the same directory.

Open a terminal (command prompt), then navigate to the folder with your videos and script

Execute the script as shown in the example below. You will need to update the -w and -l switches with your actual frame size. -w (width) -l (length) (filename)

(width) is the horizontal resolution of your recording
(length) is the vertical resolution of your recording
(filename) is the .raw file you want to convert

An example of a complete command is shown below: -w 1280 -l 1024 vid.raw

The raw video will be converted and saved as a DNG sequence in a folder of the same name as the .raw file.

Let us know how this works for you!

John DeLonghi:
It might be useful if you could post here the advantages of shooting RAW with the Chronos...


--- Quote from: John DeLonghi on February 20, 2018, 08:24:51 AM ---It might be useful if you could post here the advantages of shooting RAW with the Chronos...

--- End quote ---

I'll let this comparison speak for itself:

Advantages of RAW are far greater control of the image processing pipeline, better color correction, better demosaic, etc. This ultimately results in far sharper and more accurate images than the current in-camera processing provides.

Better in-camera processing is on the way, eventually you should expect in-camera to be almost as good as the raw samples.

You can also find the full scenes, and dng attached.

John DeLonghi:
Well that's very dramatic. Much more so that I'd see with a jpg/RAW comparison from a DSLR.
Needless to say, I'll be shooting RAW from now on!

Is there any chance of posting a road map of the various key firmware improvements you're working on so we'd get an idea of which will be available when?

Wonder if it would be possible to save both RAW data and H.264 of the same clip automatically in a future firmware. Without having to change settings and save each one separately. That way it will be like RAW + JPG on still cameras.   The detail improvement with RAW is like getting a new camera.   Will test in the next few days.   ;D


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