Try changing the 'input color profile' ... the 'linear XYZ' appears to make for a reasonable starting profile, some of the other profiles may also be of interest ... the infrared is different!!
David On 02/25/2017 11:18 AM, Tim Rolph wrote: > Before anyone points out the error, darktable-chart produces a style that > contains a color-lut and tone curve that either corrects that image to look > like the refernce image, whether that be in camera jpeg or another processors > output ie CaptureOne or just the reference data for your color chart. and not > an icc profile. > > Tim. > > On Saturday, 25 February 2017 18:29:58 GMT Tim Rolph wrote: >> Hello, the card I use is two sided, it has white grey and black on one side >> and the standard 24 colors on the other and yes you can use Adobe DNG to >> produce a color profile for use in Lightroom and rawtherapee. However I use >> it mostly for a custom WB in camera on my 14 year old DSLR canon it is just >> a matter of taking one full frame image of the WB side of the card and then >> telling the camera to use the custom WB image. Of course you need to change >> images if the lighting changes significantly and you can also use it within >> dt with the spot wb option. >> While on the subject of colour profiles I have recently used the excellent >> darktable-chart programme to create a profile and tone curve using a wolf >> faust it8 scanner calibration target that I purchased for 15.00 euros back >> in 2009 and I can say it is better that any other profile that I have >> produced using any other method. >> >> Tim. >> >> On Saturday, 25 February 2017 16:10:36 GMT Remco Viëtor wrote: >>> On samedi 25 février 2017 01:38:01 CET Marcus Sundman wrote: >>>> Well, first we need sensible support for color cards in darktable. (Now >>>> you have to go through crazy many hoops to set your whitebalance from a >>>> color card, including multiple import/export and profile generation in >>>> an external program and custom command line tools and whatnot.) >>> First you need a correctly calibrated and profiled screen (and printer if >>> you plan on printing). Without that, you'd have to work strictly by the >>> numbers, because there's no way you can visualise the final result. (OK, >>> if >>> you publish on the web, >90% of the viewers won't have a profiled screen, >>> but at least you know how it should look) >>> >>> Then, setting your white balance from a *colour* card is looking for >>> trouble (if it is at all possible to get any decent white balance from >>> such a card). >>> >>> As has been said already, for a white balance, you need a neutral spot in >>> your image: light or dark gray, but not white or black. (Such a spot can >>> of >>> course be a *neutral* spot on your colour card). Remember that 'setting >>> the >>> white balance' means changing the ratios green/red and green/blue (in >>> practice, green is set to 1.0, and the red and blue channels are >>> multiplied >>> by one value each, depending on colour temperature and tint, DT _shows_ >>> those multipliers in the white balance module, and allows you to change >>> them directly). >>> >>> When you have that neutral spot in your image, in DT it's just a matter of >>> choosing the "spot" mode in the white balance module and select a >>> rectangle >>> on the neutral spot. >>> >>> The colour patches are used to create a *camera profile*, and yes, this >>> needs an external programme (or two), just like screen or printer >>> profiling. *Unlike* screen and printer profiling, it's something that's >>> mostly needed for very colour critical work. (the few times I bothered >>> with >>> a camera profile, the results with a custom profile were identical or >>> nearly identical to the default profile and I had no way to show which was >>> better) And when you get to that level, you also have to be very careful >>> about your lights all having the same colour, as the colour of the >>> incoming >>> lights influences what the camera "sees". >>> >>> And just a small question: is there *any* raw developer that includes the >>> possibility to generate an input profile from a colour card? >>> >>> Remco >>> __________________________________________________________________________ >>> __ darktable user mailing list >>> to unsubscribe send a mail to >>> darktable-user+unsubscr...@lists.darktable.org >> ____________________________________________________________________________ >> darktable user mailing list >> to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org > > ____________________________________________________________________________ > darktable user mailing list > to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org > ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
