Maybe because the effect produced by the module affects the final result, whatever the values are set to.
Setting them to "zero" will enhance the result in a neutral way, which does not mean "with no effect". Moving the sliders will then increase or decrease the initial effect. I feel like having written martian... very bad feeling... did someone understand what I mean ? > Message du 17/05/17 20:11 > De : "I. Ivanov" > A : [email protected] > Copie à : > Objet : Re: [darktable-user] contrast brightness saturation changes image > even without changing values > > Hi Tobias, > > The concern is actually not that the blue cast exists. The concern is > that it changes from blue to purple by just enabling the "contrast > brightness saturation module" - without populating any values in it. > > My expectation is that if I am to enable the module and do not modify > any of the values - brightness / contrast or saturation - all of them > remain zero - then it should not alter the image (but it does). > > Regards, > > B > > > On 2017-05-17 01:32 AM, Tobias Ellinghaus wrote: > > Am Dienstag, 16. Mai 2017, 18:42:23 CEST schrieb I. Ivanov: > >> Hi All, > > Hi. > > > >> Stumbled on the following. > >> > >> https://www.dropbox.com/s/nwq5lt3r8d1b2ju/Screenshot%20from%202017-05-16%201 > >> 8-33-53.png?dl=0 > >> https://www.dropbox.com/s/ef1un9w1oca8rl0/Screenshot%20from%202017-05-16%20 > >> 18-33-10.png?dl=0 > >> > >> The only difference between the 2 images is turning ON or OFF Contrast > >> Brightness Saturation. However - the values remain 0,0,0 > >> > >> I expect that there should be no change as even if the module is active > >> - I have not changed any values within it > >> > >> Even the histogram changes by just enabling the module and the exported > >> images are certainly different. > >> > >> Is this expected? I did not expect it. > > What you are seeing is a problem with very saturated blue. Try enabling the > > gamut clipping in the input color profile (2nd dropdown there). Set it to > > "linear Rec2020 RGB" for a start. > > > >> DT 2.2.4 on Ubuntu 16.04. > >> > >> Regards, > >> > >> B > > Tobias > > ____________________________________________________________________________ > darktable user mailing list > to unsubscribe send a mail to [email protected] > > ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
