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Topics - Skinny

#1
General Chat / Swap red/blue channels in DNG?
May 08, 2023, 01:42:10 PM
Hi guys this is not ML related question but I know that people here have a lot of deep specific knowledge about dng format and raw data.

I used android phone to shoot some raw videos (it is possible with Motion Cam app).
And from this app you can export everything to dng sequence and edit in any program you like.

The problem is for some reason raw images from my phone look like they have red and blue channels swapped..

And I can change channels in post-processing, but I'm afraid the whole raw conversion before it will happen with wrong data. For example stuff like white balance will be processed who knows how..


If you know how I can process DNGs to swap red and blue channels before importing them, it would be awesome. If there is no easy solution to this problem, I can code with C/C++ but I am not really experienced with it, wrote stuff for AVR and ARM mostly just for fun.. If you push me in right direction (DNG processing) and it is not too complicated maybe I can figure it out..

I included one dng frame as an example (7 mb), maybe it is not r/b channels problem?

https://filetransfer.io/data-package/z7ss4jYf#link


This is what I see when just open it in photoshop



And this is after some tweaks after I swap blue and red channels

#2
https://www.youtube.com/watch?v=IImiHjbmX7c

This is a software that can do extreme denoising of RAW images with some new cool algorithms and so on.

And I also saw in some youtube video that it can also remove aliasing, which is a huge deal for users of Magic Lantern :) But I can't find this video again for some reason, and no information about this option unfortunately.

So this software takes RAW images, do processing and you can save them as RAW again. Which is perfect for MLV App workflow, I thought of converting MLV to DNG, do processing and convert DNGs back into MLV to proceed as usual with MLV App...


But at least version 2 of PureRAW can't process DNG files extracted from MLVs... I searched the internet and it was suggested that it can be because of the wrong metadata,
for example here is the method of changing two fields (make and model)
https://tutodxo.com/en/exifs-modification/

I tried this but in my case it was not enough... So any thoughts?
#3
Hi everyone, here is a small review of Helios 44M and some footage that was shot in september :)



By the way, is it too saturated? Unfortunately we only have a laptop with a *very* poor screen and no way to check on any decent monitor for now..
#4


I made *a few* shots here, other than that it is Rezeda's work

but I can share technical details:

  • Regular 3x3 raw 1880x784 in 12 bits on 5D2
  • Lens - Industar 50-2 (50mm f/3.5)
  • Color grade - 100% MLV App
  • Cut in Premiere with some warp stabilizer
  • Shot handheld using neck strap

I like how poplar fluff slowly flies in the air :D

Thanks to all guys on the ML project :)
#5
This is not exactly related to cameras, but if you also do a lot of audio recordings or make custom cables for your cameras this trick can be very useful. I know many of you guys are into the electronics. So I think it can be helpful.
I hope this stuff is OK in the hardware section of a forum. I invented this interesting method of checking cables myself, and never saw anyone doing this, but similar techniques are used in industrial applications.

https://www.youtube.com/watch?v=YsIAdSP0_xw
#6
Share Your Videos / Winter Ambient (5DII RAW)
April 23, 2021, 11:01:32 PM


Hello guys, this is just a short video I shot for my ambient track.

I used Canon 5DII with latest reddeercity's build, in 3x3 mode (1880x786) and 12 bits for this test (my cf card is too slow for anything better than this) so you can see aliasing sometimes.
Everything was shot handheld with Helios 44M wide open (f 2.0)

For the music I used vintage sampler (Yamaha SU700) and Korg Volca Keys for the bass.