The Raw processing module has recently gained a new tool: a multi-area WB.
This new WB mode allows to compute the white balance coefficients by averaging several rectangular areas across the image. The resulting average is weighted according to the size of each area, so larger areas contribute more than small ones (proportional to the number of pixels in each area).
When the tool is activated the first time, and no areas are yet defined, a square around the mouse pointer suggests the placement of the first WB area. Once the first is placed, additional areas can be inserted with a Ctrl-Alt-left mouse click.
Existing areas can be moved by left-clicking anywhere inside them and dragging with the mouse.
Areas can also be resized by dragging one of the four red corners.
Finally, areas are deleted by right-clicking inside their rectangular region.
Here is a screenshot showing the new tool in action:
As usual, updated packages can be downloaded from the github site.
Any feedback is welcome!