Thanks ! I could make you a tuto about that, but it wouldn’t contain anything that has already been said elsewhere. The technique is stupid simple, but the bulk is eyeballing the result and deciding if you need to be more aggressive or gentle on the correction. It’s more eye training rather than tricks.
Hello guys quite beginner/intermediate level darktable user there i a way to calibrate profiling with color checker in wondows? If yes any link video? Im using 3.4.1
The color checker tool will be shipped in dt 3.6. It’s not in 3.4.
Is it mostly done by splitting the image into 6 wavelets and using the blur tool on the coarsest one?
User manual to the rescue:
https://darktable-org.github.io/dtdocs/module-reference/processing-modules/retouch/
It is working nicely if you can compile it from the master branch on github…
Yes, but not just the coarsest one. You need to preview each scale to see if it contains unwanted texture, and blur each scale with the appropriate blur radius to smooth it. My personal touch is that I always put an opacity around 50% on each blurring mask to avoid waxy skin.
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Ok thanks. I just need more practice.
will it also support the x-rite colorchecker passport? If not, what would you need to support it?
Yes, it does (both variants from before 2014 and after).
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Looking forward to that, looks amazing and so simple
Hi Aurelien, thanks for the great work and effort you put into Darktable I really love Filmic V4. I look forward to exploring the new and improved options in DT3.6. There is one feature I really liked in Photoshop Elements. It was never put into Photoshop itself and only ever worked on an 8 bit image. It was a simple eyedropper tool to color balance an image based on skin tone. This option was great for portraits. It also allowed fine tuning the result as not all skin tone are the same, but it was a brilliant tool. I was wondering if you could use your talents to create something like this in a future release of DT. And again thanks for your commitment to DT.
There are so many different colors of skin and so many tints of spray tan, I’m not sure how that feature is possible.
Actually this would not be that hard. In the analog days of film we had colour spot analysers that we programmed for skin tone and these worked very well. It is surprising how similar skin tone is even between various ethic groups and countries. But as I suggested the tool exists in Photoshop elements and works very very well. Strange it is not in Photoshop. Lets be fair, most shots don’t have a grey card but do have skin tone. I only suggest it because I have seen it work.
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Please realise that I was saying the skin tone for a dark skin person and a light skin person is surprisingly similar in the ratio of RGB or YMC (analog film) and that was no racial slur intended in my comment. Also as with any color balancing tool it is only meant to get us within a close ballpark and fine tuning may still be necessary. I have used this tool with great success in Photoshop elements and have never seen a similar tool in any other program.
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Papers have been written on the closeness in hue between skins, despite a wide variety in lightness. From memory, I think the YCbCr colorspace is useful, ignoring the Y channel.
It may not be what you are looking for exactly but it might apply. Sometime s the skin color has a cast that reflects the lighting. Correct ing the skin correct s the image sometimes. I have used the color calibration and selected a skin patch as if doing a spot WB. Then switch this to custom if it doesn’t automatically go to that. This neutralizes the skin so now I just reduce the chroma to pull back on the effect until I get a nice skin tone and often this is a nice correction for the whole image