Multiple Gradients/Graduated Filter

[patdavid]

Just asking for a feature request per this thread on the forum.

The OP was looking to be able to apply multiple graduated filters to an image (which I think would be handy also).

[dngimage]

That sure would be handy. And if it could add some gradient blur that would be great too. Some mouse control would be handy as well.

[michaelezra]

That would be a really useful feature.

[Excaliburst]

I second that feature. Have been missing it since my conversion from LR to RT... and it is one of those things that still holds me back to LR 5.4.

[epa]

I'd like to shoot with a real graduated filter on the camera, then undo the effect of that in RT. So you now have an image with a uniform exposure level, but effectively higher dynamic range (the sky not blown out). Having done that, I might then want to selectively add a graduated filter effect for artistic reasons, or before saving the image in a format that has limited dynamic range.

So I would want to apply two graduated filters in RT. The first one is a fixed negative filter setting which I've tuned to the characteristics of the filter I shot with. The second one I would adjust for each image. I can certainly see a case for adding additional graduated filters at different angles in some circumstances.

[jparsert]

Any new info on this?

[jonathanBieler]

This is now possible with local adjustment, using the shadow & highlight tool in standard & advanced mode (it's well hidden). @Desmis also there's no control for the width of the gradient, I guess that would be quite easy to add. If you gives me some pointers (where the relevant code is) I can try to add it myself.

[Desmis]

Hello @jonathanBieler

In LA, gradient are present in 5 modules (not in basic mode)

• Shadows Highlight - Luma mode
• Dynamic Range and Exposure - Luma mode
• Log encoding - Luma mode
• Color and Light : luma mode, chroma mode, hue mode
• Vibrance : luma mode, chroma mode, hue mode

There is also a "graduated filter mask" (of course when using mask..) in "Dynamic range and exposure" and "Common color mask"

To add functionnalities to gradient you can use multiple spots, position of the center of the spot, transitions

• For example, if you use "Full image", you can zoom the image to 8 or 15% and reduce the size of the spot - it will be over the size of full image, but allows transition

• If you use "Normal spot", choose an asymetrical size spot.

In transition (settings) that leeds to gradient you can change for example : transition value (gradient), but also differentiation between X and Y (gradient will be different in X and Y) But of course you can't ensure a rotation of the spot.

DeltaE also has a role to play, albeit different

Your question on code All gradient uses 2 functions :

• calclocalGradientParams locate in iplocallab.cc line 5359
• Calcgradientfactor (same function as in main) in iptransform.cc

Have a nice day

Excuse my very bad english.

Jacques

[jonathanBieler]

Thanks @Desmis I'll look further into it. Another thing I've noticed is that the graduated filter and the LA one don't behave exactly the same in terms of color, I guess that's due to the position in the pipeline ? I'm pushing it way too much in this example so I don't think it's a huge deal in practice, but I prefer the graduate version here :

I've been using LA for a while now and I'm quite happy with them but I have to say it should be easier to dodge & burn. I think all the tools are there but they maybe need to be streamlined a bit to be more user friendly.

[Desmis]

hello

I forgot to mention "feather" which is also in "Transition gradient" and is common for each Spot (only of course if you use a GF

Moreover it is obvious, by design of LA, with the taking into account of the deltaE, that the rendering according to the color will be different. It is enough to act on "Scope".

When to simplify, difficult, without removing something... but all ideas are good to take.

Thank you

Jacques