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Topics - chadat23

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Here's an app that I'm writing for deflickering, ramping, and stabilizing DNG files that are part of a timelapse. It does this by editing embedded Lightroom data.

The app has a similar workflow to LRTimelapse but with a few key differences. Instead of working with Lightroom sidecar files, it directly edits the xmp data that's in the DNG files (like what Lightroom does). Also, instead of relying on an exteral app to render each image, the app does it internally with its own custom DNG read/write/render engine. This lets me do things like only render the parts of each pic that I care about when deflickering (which speeds up the process), not have to rerender between deflickering runs that continue to reference the same portion of the image, and more interestingly, it lets me stabilize shaky image sequences by adjusting crops after comparing rendered images.

Additionally, while it's not presently a main priority, I'm most of the way to being able to do things like creating DNGs with reduiced noise from comparing other DNGs, or automatically removing flying birds or bugs from timelapses.

You can find it at

While it's still rough in some regards, I'm pretty happy with the results. Here's something I made with an earlier version.

Edit: I should throw out that I'm expecting to expand it to work with other editing software that works with DNG files, whether they store edit info internally, or to sidecar files. When and what I work on will largely just be a function of what people are interested in and what sounds interesting.

I've gotten a lot from this community and hope to give a little back!


General Chat / Timelapses with a "beat" pattern?
« on: February 10, 2019, 09:33:17 AM »
Often when I capture timelapse sequences they seem to have a "beat" to them, an almost regular shake to them. Any thoughts on what would cause this or how to prevent it? It does seem to be more prevalent when the tripod's on something softer like dirt as opposed to a big rock or pavement, but if it was just the ground squishing I wouldn't expect such regular movement.

And for those tinkering with DNG file internals, I checked and the Active Area and Default Crop Origins are constant.


General Help Q&A / Auto ETTR match camera settings?
« on: March 19, 2017, 04:52:58 AM »
Does auto ettr limit itself only to settings that you can input through the camera's UI, or will it also use in between values and then just set the camera's display and metadata to the nearest value, say, taking a 1/22 second exposure while recording it as 1/20?

I've written yet another deflicker tool. It reads the iso, fstop, and shutter speed info out of the dng files to calculate relative brightnesses in order to set the exposure in Lightroom. It generally works well when I set my camera to manual and make adjustments as needed, but I get a lot of flickering when I use auto ettr. Thanks!

HDR and Dual ISO Postprocessing / Dual-Iso "No Dual ISO"
« on: March 09, 2017, 07:14:27 AM »
Using the Lightroom plugin 3.0-BETA3.3 (Lightroom 6.8) on Windows 10 I converted a mid-day timelapse sequence (lighting didn't change) where every shot had the same exposure. 40 ish photos from the middle of the sequence didn't convert and I still can't convert them; when I try it just immediately finishes and lists them under the "No Dual ISO" tab. I've had this happen before when processing gets interrupted for some reason and have been able to solve it by restarting my computer but it's not working this time. Thoughts? Thanks!


Share Your Videos / 6D landscape timelapse
« on: February 28, 2017, 07:35:57 PM »
Here's something I made with a 6D using the ML intervalometer and, for some shots, dual-iso.

Camera: 6D
Lenses: Canon EF 24-105mm f/4L IS USM and Samyang 24mm F1.4
Software: Lightroom, something I'm writing to do lighting transitions and image stabilization natively in DNG, and HitFilm

Duplicate Questions / Dual ISO/graduated neutral density filters
« on: November 18, 2014, 09:37:53 PM »
I was imagining accomplishing what a graduated neutral density filter does using the camera iso setting above a user defined line and a ML defined iso for below the line. Being able to angle the line could be nice but isn't necessarily necessary. Maybe you'd also get a marker when using Live View so you wouldn't have to guess and check as to where the line is. Thanks


HDR and Dual ISO Postprocessing / Dual iso missing Exif information
« on: November 01, 2014, 08:54:42 PM »
I've been post processing dual iso pictures with BarracudaGUI, I have exiftool selected where it's looked for in the settings. It's in the same folder as cr2hdr.exe. However, after processing, when I look at the file properties all of the camera specific information is gone and only the basic file information remains. Any idea why this would happen or how to fix it? Thanks


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