Re: [darktable-user] contrast brightness saturation changes image even without changing values

2017-05-17 Thread I. Ivanov
I did try the suggestion as per Tobias and indeed it produces a pleasing result. Thank you Tobias... I experimented with sRGB clipping and looks like it pushes towards purple while linear Rec2020 RGB pushes towards blue. What I am learning (together with the gamut clipping) is the assumption

Re: [darktable-user] contrast brightness saturation changes image even without changing values

2017-05-17 Thread johannes hanika
30 years young! could you please try what tobias suggested? the slightly longer answer is that Lab is an interesting colour space, so is your camera rgb. the colour matrix produces mostly matching colours for usual tones, but due to the linear approximation this matrix represents, it pushes out col

Re: [darktable-user] contrast brightness saturation changes image even without changing values

2017-05-17 Thread I. Ivanov
In 30 years - I have never seen a graphic program of any kind to behave in such a way and it would be considered "normal". The only settings available are brightens, contrast and saturation and they are not altered by any number. There should not be any change to the image. Regards, B On 20

Re: [darktable-user] contrast brightness saturation changes image even without changing values

2017-05-17 Thread darktable
On Wed, 17 May 2017 11:11:43 -0700 "I. Ivanov" wrote: >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). I think that it is not a "correct"

Re: [darktable-user] contrast brightness saturation changes image even without changing values

2017-05-17 Thread I. Ivanov
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 o

Re: [darktable-user] contrast brightness saturation changes image even without changing values

2017-05-17 Thread Tobias Ellinghaus
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?