Issues with certain conversion

Hi there,

I did post a similar message on the Facebook group, but thought I’d post it here too.

I’ve noticed with some images, particularly those with a lot of sky - or similar, that I get some ‘wacky colours’.
I noticed similar issues on sometimes unexposed images too, but this is to be expected.
In the previous versions of NLP I could use the ‘sync scene’ from another, well rounded image and it would work wonders.
No such luck with V3 as it doesn’t have the option (unless I’m missing it).

There is a chance I’m being criminally stupid - I haven’t scanned much in the past year so not really used the app and played around.

I will try to post some examples tomorrow

Any help or advice is greatly appreciated!

NLP v3
Vuescan DNGs with a plustek 8200i

This seems to be fairly in line with what NLP can do. NLP adjusts tone curves according to what it finds in the image. Images with limited structure, contrast and hue content tend to raise the risk of wacky colours. Sometimes, it helps to crop the uniform parts off before using NLP. After the conversion, the crop can be switched off again.

In Lightroom you can mask the wacky areas and adjust the colour to taste, localized to the mask. Just remember that the controls work in reverse on non-rendered raw files.

Thanks, I did indeed try this but it only works for limited scenes in my experience.
Or rather, for some of the images I take, it doesn’t work.

I noticed on another post, it was mentioned about adjusting the black point - this has helped in some cases for me, but isn’t perfect sadly

Yes this is true, I have made Lightroom setting changes, but as soon as I use ctrl-n to load up NLP, it reverts my changes.

@nate is there any chance of bringing the sync scene option back? :frowning:

Yes, that would be most welcome :+1:

“…as soon as I use ctrl-n to load up NLP, it reverts my changes.”

That is weird - never seen it happen, nor do I know of any settings in Lr or NLP that would cause it - perhaps Nate has insight into it - he knows the programs from the inside.

Going back to your issue of 'wacky colours", I have not experienced this either, but I am not using either Vuescan or a Plustek scanner. I wouldn’t rule out issues specific to that set-up causing it, either because of how they perform or how you are using them. Needs more info on settings and diagnosis of the scanning conditions.

Yes, it’s back in v3.1 which is in beta at the moment. I will PM you a link.

Yes, it actually always recalculates/re-renders the image or images when loaded, based on the settings and analysis associated with the image. It just isn’t noticeable usually, assuming nothing has changed.

So if you just use Lightroom itself to to copy/paste the settings from another image (which has different analysis data and different settings), that will be overwritten when you reopen Negative Lab Pro. Even if it didn’t happen immediately on opening, it would have to happen when a setting change was made (in which case the calculations would be based on the current image analysis and settings, and not on the image that was copied from). Does that make sense?

-Nate

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To be clear, the quote above under my name is not from me, nor my problem. I picked it up from the OP who was having the issue.

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Amazing - thank you so much! - I will keep an eye out for the link in my DMs