Hi, I'm interested in writing an automatic white balance module or preset for darktable, similar to rawtherapee's AWB mode. Briefly spoken, it allows one to set a bias value for warmer / cooler tones and calculates the color temperature using all pixels in the image (like using the spot preset with a 100% area for the color picker).
So far I kind of understand darktable's module interface, but I don't understand how the color picker works. To my understanding, the color picker can only function when in GUI mode? I.e. it needs mouse focus, calling the color picker module in the background will crash darktable. Another thing I couldn't figure out was how the spot preset works exactly. A comment says, that the coefficients are filled in the "expose" callback, which, I guess, refers the X11 Expose event, but I can't find the callback in the source code... So, for a working module or preset I need some information: 1) How can I get all the necessary information / color values from the picture (color picker?)? 2) How does the algorithm for calculating the white balance using a bias look like? Thank you very much, Jochen ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
