Hi Malte, you could try darktable-chart . Of all the methods that I have tried it seems to give the best comparison to the in camera jpeg. It not only matches the tone curve of the image but also the color.
Have a look at, http://weeklyedit.com/camera-profiling-darktable-chart/ You will need a color chart though. I used a wolf-faust scanner calibration chart that I already had because it has 288 color patches and therefore should produce a more accurate color match you can get one from, http://www.targets.coloraid.de/ Hope this helps. Tim. On Monday, 24 April 2017 23:26:18 BST Malte Cornils wrote: > Hi Tim, > > thanks - it's certainly helpful for the process, and I redid a whole ISO > series now. Unfortunately, I still don't get anything resembling a proper > curve. > > Any other ideas? > > -Malte > > 2017-04-23 15:42 GMT+02:00 Tim Rolph <[email protected]>: > > Hi Malte, have you seen this video on basecurves? > > > > http://weeklyedit.com/basecurves/ > > > > Tim. > > > > On Saturday, 22 April 2017 23:14:13 BST Malte Cornils wrote: > > > Hi, > > > > > > although there is now even denoise support for the RAW DNG's created by > > > LG's Nexus 5X phone main camera, the basecurve between JPG and RAW seems > > > very much off. I was trying to follow > > > http://www.darktable.org/2013/10/about-basecurves/ to create my own > > > basecurve, but the result was much worse: > > > > > > While dt-curve-tool-helper worked following a mixture of the article and > > > the tools/basecurve/README.md for both RAW DNGs/JPGs, and the curve tool > > > invocation generated a useable shell script (attached), this did not > > > look > > > like a curve at all and had horrible colours. > > > > > > I tried with both a black/white picture following the blog instructions, > > > > as > > > > > well as a normally exposed one. You can find them here (my own work and > > > CC0-licensed): > > > > > > https://srv.cornils.net/DSC_0132.DNG > > > https://srv.cornils.net/DSC_0132.JPG > > > https://srv.cornils.net/DSC_0135.DNG > > > https://srv.cornils.net/DSC_0135.JPG > > > > > > (will leave them up there for at least six months) > > > > > > How can I get a reasonable basecurve out of those images? They were > > > generated by FV-5 camera app, which has DNG RAW support. > > > > > > Thanks > > > -Malte > > > > > > ____________________________________________________________ > > > > ________________ > > > > > darktable user mailing list > > > to unsubscribe send a mail to darktable-user+unsubscribe@ > > > > lists.darktable.org > > > > > > ____________________________________________________________ > > ________________ > > darktable user mailing list > > to unsubscribe send a mail to darktable-user+unsubscribe@ > > lists.darktable.org > > ____________________________________________________________________________ > darktable user mailing list > to unsubscribe send a mail to [email protected] ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
