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letmaik / rawpy

📷 RAW image processing for Python, a wrapper for libraw
https://pypi.python.org/pypi/rawpy
MIT License
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Edit attributes other than Rawpy.raw_image ? #130

Closed amonod closed 3 years ago

amonod commented 3 years ago

Hi,

First I wanted to say thank you for making this library. It goes without saying that it is extremely convenient for many python image processing applications.

My actual question is the following: when a raw file is opened with rawpy.imread(filePath), we can change the values of the Bayer array by affecting new values to the raw_image attribute of the Rawpy object. I've noticed, however, that we cannot edit the values of other array attributes, such as Rawpy.black_level_per_channel, or Rawpy.color_matrix . The potential usefulness of being able to edit such attributes is pretty obvious. Why is it not possible?

letmaik commented 3 years ago

These are (mostly) related to postprocessing. You can specify them as arguments in the .postprocess(..) method. See also the API docs.

amonod commented 3 years ago

Thank you, I had not seen the user_black parameter of postprocessing. However, there does not seem to be an option to change the color matrix.

letmaik commented 3 years ago

These are all the supported options and how they are passed down to libraw: https://github.com/letmaik/rawpy/blob/5e510fbc5f7b75f99380bd71d83b3d3a7db06888/rawpy/_rawpy.pyx#L893-L928 If a libraw option (see https://www.libraw.org/docs/API-datastruct-eng.html#libraw_output_params_t) is missing that you need, please open an issue specifically for that.