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Matt Grum
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Re: Lossless RAW files from the Sony A7/A7R?


lozoyad wrote:
I am very interested in learning how you did this, software you are using and how I can obtain a copy of it. Again excellent job sir.


This was just a first experiment to remove artifacts in a very specific scenario, there\'s a lot more work to make it work for all images. I\'m using dcraw, which is an open source RAW converter written in C as a base and modifying the routine it uses to decompress Sony RAW files.

Currently it\'s not useful for anything other than completely automated RAW conversion to TIFF, the next step is to make it output a DNG file that someone can process in Lightroom or whatever their default workflow is. I\'ll release the code when I\'ve done this (currently being held up as I can\'t get the @%$! Adobe DNG SDK to compile)...


dgdg wrote:
Great work.
If you can manipulate the code, can you simply bypass the compression?


I\'m working directly on RAW files after they\'ve been transferred from the camera. I don\'t know if anyone\'s been able to modify the camera firmware in any way. I don\'t have the knowledge to attempt this, hopefully one of the magic lantern guys could have a go as this would be much better than trying to fix compression artifacts after the fact!



namestaken wrote:
Computer graphics card companies will do anything just to get an extra ounce of performance, for reviews.

It\'s interesting how different camera companies are


The problem is there\'s no standard reproducible benchmark for testing cameras, each review site has it\'s own tests and methodologies so it\'s much harder to game. Also people rely on benchmarks and scores much more when buying graphics cards than cameras.



davewolfs wrote:
This is very interesting, good work! Is Sony\'s firmware open? Where did you get the original code?

Edit:

After reading more of thread I see that you are fixing this in the RAW so effectively smoothing the signal on these artifacts.


Yeah sorry I haven\'t found a way to alter the camera firmware!



May 14, 2015 at 08:15 AM





  Previous versions of Matt Grum's message #13013850 « Lossless RAW files from the Sony A7/A7R? »