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How do I deflicker and what is the meaning of the colored curves?
gwegner Offline
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Post: #1
How do I deflicker and what is the meaning of the colored curves?
Before deflickering make all your transitions. Deflickering will only change the exposure values.

Set a reference are by clicking and dragging the mouse inside the preview window around an area that will serve as reference for the brigtness. Try to avoid parts with moving objects (waves, cars etc.) instead focus on an area that only shows the unwanted flicker you want to get rid of.

Read this thread to learn how to edit your images to get the best of the deflickering algorithm.

Now make sure your exposure curve hasn't any former deflickering applied yet (straight yelow curve without bumps), if not right click on exposure in the table header and select "reset current column values without keyframes" (in this case reapply the auto transition).

You already see two curves important for deflicker:
  1. The yellow curve is the original exposure curve (if you don't see it make sure to select "exposure" on the curves selector below the preview)
  2. The blue curve is the average brightness of your image or reference area. To set a reference ares draw a rectangle with the mouse into your preview panel. Set the referece so that only local, unwanted flicker is captured not global effects like passing clouds etc. Find for example a place in the sky where no clouds pass or a part of the image that lies in the shadow all the time. The Goal is to separate flicker from wanted changes in lightning conditions. You can even set different reference areas on different images, LRTimelapse calculates an animation between them (like key frames). Single click in the preview erases the current reference-key-frame, double click resets all.

Now you can turn on the deflicker checkbox. New curves appear:

  1. The Green curve is a smoothed out version of the blue one. I serves to indicate how the brightness of the selected area should behave. It should preserve any global (wanted) changes in lightning conditions and smooth out the unwanted flicker. With the "Avg. smooth" slider you can control how tight the curve matches the original blue brightness curve.
    My tip: avoid changing the Strength slider, in 99% its okay at the default value.
  2. The red curve shows a compensated yellow (exposure) curve. So when you hit save the red curve turns into the new yellow (deflickered) exposure curve. Basically the red curve is the blue curve mirrored on the green curve. You will see the changing effects when you play with the sliders.

The new version 2014 of my EBook Timelapse Shooting and Processing is available now,
covering all new Workflows with LRTimelapse 3! Available in English and German.

lrtimelapse.com - advanced Time Lapse Photography made easy!
gwegner.de - Fotografie, Zeitraffer, Video, Reisen.
facebook · Google+ · twitter · vimeo

(This post was last modified: 10-28-2012 09:48 PM by gwegner.)
12-27-2011 06:19 PM
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anugrahbahl Offline
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Posts: 10
Joined: Jul 2012
Post: #2
RE: How do I deflicker and what is the meaning of the colored curves?
I have followed all your instructions in detail to de-flicker the timelapse I'm working on but could not able to get rid of flickering.
I shot with DSLR in Av mode, aperture was set to: 3.5 and ISO: 100, Focus: Manual mode, Image stablization: OFF. Camera mounted on the tripod.

I use Lightroom 4.1 and LRTimelapse 1.9.4

Can you help me.

Thank you sir Gwegner.
Wait to hear from you.


(12-27-2011 06:19 PM)gwegner Wrote:  Before deflickering make all your transitions. Deflickering will only change the exposure values.

Read this thread to learn how to edit your images to get the best of the deflickering algorithm.

Now make sure your exposure curve hasn't any former deflickering applied yet (straight yelow curve without bumps), if not right click on exposure in the table header and select "reset current column values without keyframes" (in this case reapply the auto transition).

You already see two curves important for deflicker:
  1. The yellow curve is the original exposure curve (if you don't see it make sure to select "exposure" on the curves selector below the preview)
  2. The blue curve is the average brightness of your image or reference area. To set a reference ares draw a rectangle with the mouse into your preview panel. Set the referece so that only local, unwanted flicker is captured not global effects like passing clouds etc. Find for example a place in the sky where no clouds pass or a part of the image that lies in the shadow all the time. The Goal is to separate flicker from wanted changes in lightning conditions. You can even set different reference areas on different images, LRTimelapse calculates an animation between them (like key frames). Single click in the preview erases the current reference-key-frame, double click resets all.

Now you can turn on the deflicker checkbox. New curves appear:

  1. The Green curve is a smoothed out version of the blue one. I serves to indicate how the brightness of the selected area should behave. It should preserve any global (wanted) changes in lightning conditions and smooth out the unwanted flicker. With the "Avg. smooth" slider you can control how tight the curve matches the original blue brightness curve.
    My tip: avoid changing the Strength slider, in 99% its okay at the default value.
  2. The red curve shows a compensated yellow (exposure) curve. So when you hit save the red curve turns into the new yellow (deflickered) exposure curve. Basically the red curve is the blue curve mirrored on the green curve. You will see the changing effects when you play with the sliders.
07-14-2012 03:37 AM
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gwegner Offline
Developer of LRTimelapse
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Posts: 4,167
Joined: Feb 2011
Post: #3
RE: How do I deflicker and what is the meaning of the colored curves?
Normally deflicker works just fine with the default settings. Just set an appropriete reference area into a region where ideally only flicker is observed. You set the reference area by dragging a rectangle into the preview pane.

If you need more help, I need more information from you, for example a screenshot of your preveiw panel with the curves and the reference area. Ideally with deflicker turned on.

The new version 2014 of my EBook Timelapse Shooting and Processing is available now,
covering all new Workflows with LRTimelapse 3! Available in English and German.

lrtimelapse.com - advanced Time Lapse Photography made easy!
gwegner.de - Fotografie, Zeitraffer, Video, Reisen.
facebook · Google+ · twitter · vimeo

07-14-2012 04:48 PM
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