TheShoe Loc: Lacey, WA

I was just looking at some photos from about 3 years ago that some of them have what appears to be inverse vignetting. They are darker toward the center and brighter at the edges and all 4 corners. Does anyone know what causes that to happen? There were several shots in sequence, fairly close together in time but not a burst, but only 4 or 5 in the middle of the sequence had this gnittengiv.

RichardTaylor Loc: Sydney, Australia

Possibly lighting and/or post processing.

Linda From Maine Loc: Yakima, Washington

Can you post an example? (did your spell checker reverse the order of the letters? "gnittengiv"?? Strange!)

Vignettes applied in a photo editing program can be black, white, or a color.

BB4A

Well, gnittengiv is the inverse of vignetting? LOL

Linda From Maine Loc: Yakima, Washington

👍 😄

BB4A

Kudos to TheShoe for Wednesday Evening Wordplay.

I do agree that it appears to be an obscure issue and maybe a pic of the effect would help suggest possible causes?

Linda From Maine Loc: Yakima, Washington

Main discussion topics go on for pages with guess after guess when an OP declines to share an image. Certainly would help, but might not be as much fun for the regulars. Re Word Play, I swallowed the hook, line and sinker, didn't I?

Quixdraw Loc: x

IMO this is an effect that was popular for High key for a while in film days. Not hard in the darkroon - not enough of a PP guy to comment on here and now. The backwards was clever - cast me back in time to watching Captain Video and backwards names!

TheShoe Loc: Lacey, WA

I may have a solution. I just canceled DxOs default corrections on one of the images. It looks as though it is an artifact introduced by what are dark corners where the lens did not cover them at the maximum width. The corners before DxO got ahold of the image were black. The question now one of who is at fault, DxO, Panasonic, or both? The camera is the FZ1000.

TheShoe Loc: Lacey, WA

Linda,

I thought that you would be the first to see the play.

Linda From Maine Loc: Yakima, Washington

My brain is much sharper in the morning

E.L.. Shapiro Loc: Ottawa, Ontario Canada

Seriously now

There are some lenses, usually wide angles or super-wides that require a center spot neutral density filter to compensate for overexposure in the center of the field- if you exposed for the edges the center would become darker . Because of their extreme angle of coverage, uniform exposure is not possible without the special filter- it's factored into the design. The appropriate filter was supplied with the lens. If you lost your filter, they are available at B&H- they are very costly - up to as much as over $1,300. They are made for specific lenses. The reason I mention this is that the OP's lens may have been suffering from such an aberration that was not designed into the formula- just a bad lens! Some early zooms had this issue in the wide angle range and there were no filters to compensate for the issue.

It is also true that in classical high key portraiture oftentimes is done with a "high key vignette" which was accomplished by an illuminated vignetter used on the lens. A translucent vignetter is placed in a matte-box in front of the lens and an off-camera light was aimed at the vignetter from an oblique angle. The exposure on the vignetter is adjusted so it blends into the white background. The vignetter is kept out of focus so there is a feathered edge that fades the subject into the background. This effect can be added in custom printing or post-process but the in-camera version is usually more aesthetically pleasing.

"Erutalcnemon" is "nomenclature " spelled backward!

LiamRowan Loc: Michigan

If you have Lightroom you can see "inverse" vignetting easily. In teh "Post-crop vignetting" menu the top slider is "Amount." If you have the menu set to "Highlight Priority" and slide the "Amount" left you get "regular' vignetting. Slide it to the right and you get the inverse. I'll attach the same photo with -20 Amount and +20 Amount. The inverse vignetting can be very effective in winter scenes with a lot of snow.

The -20 is not too noticeable. The +20 looks ridiculous, but illustrates how the slider works.

There is no other difference between the two images than the vignette slider. Hard to believe.

TheShoe Loc: Lacey, WA

Since it was an FZ1000 at its 9.5mm (25mm after applying the crop factor) setting, I just have to accept that I must be aware of the problem and do my best to avoid it in the future. A $1300 filter is not a reasonable alternative. If I could afford that, I could buy another camera, perhaps one without the problem.

TheShoe Loc: Lacey, WA

It is easy to see in PhotoLab, too. All one has to do is click the Compare button to see the image before the default corrections were applied.