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And here is a screenshot of my Darktable browsing screen. You can clearly see there is difference in white from pictures to pictures.
You can also see my manual setup for Camera.
F/13.0 Aperture
1/125 Exposure
My question is, how can I smooth that difference to having the same white in the background at the time of shooting. Is is a problem of light ?
I currently have 3 LED strips Above, Left and Right, a Flash above the Camera.
Should I install a slave remote flash and some light diffuser behind the camera ?
thank you for your help.