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romanvail

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welcome :) You are duplicating the article in LFI 2007 # 1 or # 2 I think. They mentioned special software. Would you mind shring the software you used?

 

the camera was originally meant to provide 14 bit uncompressed output. When it turned out to be too slow that way, Leica changed it to a special compression algorithm to provide an output that was approx the same as 12 bit.

It involved writing pointers to a LUT and compressing by multiplication and taking the square root.

 

It seems that you have found the uncompressed data, but after the LUT manipulation.

 

The conclusion in LFI was that there was no visible difference between the uncompressed and compressed image in a practical sense, but it could be distinguished in graphs.

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I don't know if it was in the article, but the difference in pixel size is due to the outermost pixeles 'normal' is used for RGB demosaic calculation only and cropped away.

There used to be a progam called DNG Recover Edges that could 'extend' the RAW files so it was possible to actually use/see these pixels.

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Hello,

 

I think I know which article you mean. Even though I do not understand what you mean by LFI 2007 #1.

 

I can not tell right now if there are visible benefits. The information content is definitely increased. I am inclined to disagree on the LUT thing though as I have full 14 bit data. :) The standard M8 dng only has 8bit of data.

 

Right now I am using Matlab as that was quick and easy. But I think I'll switch to C++. My plan would be to store the extracted data in a file which could be read by lightroom for example. So it's either dng or some easy to access proprietary raw format which can be converted. The metadata can be extracted to some extent from the jpg if needed.

 

Greetings,

Arvid

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