Local edits in ART for beginners (e.g. exposure)

[agriggio (Alberto)]

Hi,

@a6000

Is this just due to my lack of experience?

I think there is a genuine lack of documentation for ART, unfortunately. Things are getting better, thanks also to the contributions of users (e.g. @BarryThomas recently added a “quick start” guide), but writing good docs takes a lot of time.

Regarding exposure/brightness adjustments, here’s a description of how to emulate a tone curve with the Color Correction module:

ART feature requests and discussion

Ok, so here’s how to emulate a tone curve with the color correction module. We start from neutral: [Screenshot from 2020-08-19 21.01.17] We use power, pivot and offset to add contrast: [contrast] This is certainly “punchier” but the highlights are blown (check the clouds). To understand why, it is useful to have a look at the curve that is generated by the sliders. The formula is: out = \left(\frac{in - offset}{pivot}\right)^{power}*pivot which visually is something like this (in green…

EDIT: in addition to what written above, if you want a simple exposure compensation, that can be done with the “slope/highlights” slider in the color correction module, which does exactly the same thing, except that the scale in the GUI is linear, instead of being logarithmic like in the exposure module (therefore, to add e.g. 1EV of compensation, set “slope” to 2).

I probably need to find some time to turn this into a proper wiki page – it seems many people struggle with this…

Hope this helps