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Kalpanika / x3f

Tools for manipulating X3F files from Sigma cameras
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X3F_extract unable to extract files from APS-C sized Sigma Quattro H files #107

Open alextutubalin opened 6 years ago

alextutubalin commented 6 years ago

When trying to use x3f_extract on APS-C size images (both full-res and half-res), this utility displays 'Could not find any matching RAW format' messages. APS-H sized files from same camera are OK.

Here is archive, containing all 4 possible sized X3F files from this camera: https://www.dropbox.com/s/2z75tghs35slu9w/SQuattroHAllSizes.zip?dl=0

rolkar commented 6 years ago

Thanx for the report and the links to the files. I shall take a look. I do not promise and time frame for fixing it. The work on X3F Tools is on a very low pace.

Sigma is very problematic with their file format. Most is ad hoc and it is not always trivial to fix things

Sometimes it is just to add the ID for the file format. And sometimes not.

In this particular case we have those AF points. They are in a regular grid, that should be the same for APS-C. But, we need to find the offset. It is, unfortunately, hard coded for sd Q in our code. We have not found where they are defined in the meta data.

alextutubalin commented 6 years ago

The files contains mostly blue sky, so AF points are clearly visible (if AF intepolation is turned off)

But the problem is not with AF points, but with data extraction per see: DNG file is not created for APS-C files (both high- and low- res)

rolkar commented 6 years ago

Yes, I understood. But, to be able to make correct DNG files we need to interpolate the AF points.