For me argument that RAW encodes data into 14 bit per channel vs 8 bit per channel, for JPEG, is more than sufficient. But for non-technical person that is not very convincing. If we add to it fact that internal camera processor in 90% of situations does great job when it creates JPEG and you need quite high level of processing skills to achieve the same starting from RAW, rock solid RAW argument doesn’t look so good. People advocating RAW start to look like Groucho Marx: “Who are you going to believe, me or your lying eyes?”.
So, here is simple example why RAW is good. Camera handling of great difference in luminosity is nowhere near to human eye. With automatic exposure on we will get or dark is too dark or bright is too bright. Offending photo is stored as RAW and I will open it in Darktable. It should be opened by default in darkroom mode. After doing sharpening and lens correction, in correction group (one with broken circle symbol) I switch to basic group. Here is what we got:
After activating overexposed plugin all overexposed parts will become red, like here:
To remedy that I switch on exposure plugin and push slide to unreasonably low -2.61EV. Now everything what is underexposed is blue.
After adjustment of exposure to reasonable -1.42EV we still have some underexposed areas but that is in shade and we can safely ignore it.
Now we can export it and do further processing in GIMP or even we can try exporting different levels of exposure and later do exposure blending.
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