Removing vignetting created by film camera lens

[ArnoG]

Hi all,

Read this:

Integrating sphere as a uniform backlight

Hi all, As mentioned in the first post in this forum thread, a finite planar light source (such as an LED panel) will always result in an inhomogeneous light distribution on film. A planar light panel a give a homogeneous light distribution on film, provided it is infinitely large compared to the film, which is not practical for table-top solutions. It took me a while to get this done, but I just calculated the brightness inhomogeneity on a film that results from using a planar light source tha…

and this:

Integrating sphere as a uniform backlight

Small update: I managed to quite accurately create a brightness mask in LRC. The procedure is as follows: Take a shot of a blank B&W negative Import with Linear B&W profile (e.g., NegativeLab v2.3 B&W) Analyze the variation of brightness (if any) in LRC in the development module by hovering over the frame and looking at the R, G, and B values: They should be the same (since B&W) and constant across the frame Crop to see only the blank negative Apply a radial mask: My light panel is square, so…