I didn't remember exactly what it was about, but I found the post, and it was about converting to BW: https://discuss.pixls.us/t/black-printing-problem/19048/6
I appreciate the explanation. On Fri, Sep 4, 2020 at 10:42 PM Matt Maguire <[email protected]> wrote: > Le sam. 5 sept. 2020 à 11:55, Bill Martz <[email protected]> > a écrit : > >> I will have to dig through my Pixls posts to find this, but I posted >> about a problem using channel mixer, and I received that suggestion in >> reply. I tried it, and it fixed the problem as far as I could tell. I will >> see if I can find it tomorrow. >> > > Putting the channel mixer after the filmic module will "solve" the > clipping problem, but remember that channel mixer is doing a matrix > multiplication. When you multiply in a linear space like we have before > fimlic, you are doing a scaling, but when you multiply in a log space like > what we have after filmic, it becomes like raising the values to a power, > which will mess around with the contrast. If the adjustments are small, > maybe this won't matter too much in practice, but I was just warning from a > maths perspective, it could become problematic especially for larger > adjustmentd. The ideal situation is to do those sorts of scaling and > rotation transformations in a linear space without doing any clipping, then > at the end of those transforms you apply your non-linear look transform > using filmic/tonecurve/basecurve/whatever. > ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
