How to process dual ISO files

[babarasghar]

how u guys r getting such sharp images using dual iso/AETTR?
i tried dual iso with 29th jan 2015 Nbuild on my 6D n im getting horizontal banding quite visible
how to avoid that n get better images?

[Walter Schulz]

Which cr2hdr version are you using?
Which settings in your cam?

You may upload an example and a processed output file. We may be able to run it, too and compare results.

[babarasghar]

Which cr2hdr version are you using?
Which settings in your cam?

You may upload an example and a processed output file. We may be able to run it, too and compare results.

cr2hdr version? i need some guidance here,

my final images after a quick pp in lightroom 5
at ISO 200 with ML diabled


at 200-1600 with no ETTR enabled


CR2 links ill upload in a while on dropbox

dual iso file
https://www.dropbox.com/s/adfzxou10tjzs9y/IMG_0828.CR2?dl=0

[Audionut]

You need to process the dual ISO files with an application.  cr2hdr.

http://magiclantern.fm/forum/index.php?topic=7139.0
See section labeled Postprocessing.

[Danne]

Try this if you,re on mac.

cr2hdr-r
http://www.magiclantern.fm/forum/index.php?topic=13512.msg139619;topicseen#msg139619

Also kitchehof lightroom plug-in works excellent.

http://magiclantern.fm/forum/index.php?topic=11056.msg131968#msg131968

[babarasghar]

thanks audionut for separating this discussion from the other thread, sorry i was using wrong thread
guys is there any video tutorial for this im kinda noob here coming back to this ML after a very long time

[Walter Schulz]

Should be pretty clear after reading the first post in kitchehof's LR plug-in thread. Please try first. No video tutorial neccessary IMO.

[babarasghar]

ok boss! thanks for speedy replies guys

How the plugin works:
Pictures selected to export are listed
Only CR2 and DNG files are supported (if file is not present, skip)
Each picture, one by one is converted with cr2hdr (with defaults or custom args)
if cr2hdr 20bit and --same-levels are selected, all pictures are converted in the same time
Picture is moved to subfolder
Picture is renamed with suffix
Picture is imported into Lightroom catalog
Label is added
Keywords are added (and created if needed)
Synchronize keywords with original file
Keyword Dual ISO raw or no Dual ISO is added to original file
Parse log file to fill metadata with cr2hdr results
Add picture to all collections
Keep or remove log file
Set the flag of the original file

is this ur talking about? well its kinda confusing for me
do we import these cr2 files normally like any other cr2?
we edit the dual iso cr2 like we normally edit any other raw file? n once we r done editing we then export it using this plugin? n when its exported where it lands? in which folder?

[Walter Schulz]

Read "How to use".
Import process is identical to CR2 because those files are CR2. And you have to edit after export. That's the rational behind it because LR cannot know how to demosaic an ISO interleaved pattern.

[babarasghar]

okay so ist i import cr2 from sd card
currently my LR5 converts cr2 to dng
n then without any editing i export it?
after exporting it then re-import new dng with name like IMG_0828-dualiso.DNG?
but problem is it doesnt put these files in a new subfolder in my catalog folder
im sure i am doing some very noobish mistake here n missing something
so plz guide me step by step
sorry for ruining ur weekend guys

[Walter Schulz]

Please just try.

[babarasghar]

okay i am trying but no help from ur side hero member

[DeafEyeJedi]

@Danne's 'cr2hdr-r' is almost too good to be true & It works really well!

It's quite simple, actually.

I've been there & I understand how you feel @babarasghar.

But please just read, READ throughly and TRY at least...

I mean how else we did get to learn how to use this properly?

We tried.

This community is here to help as long as you can participate in as well!

[babarasghar]

Thanks for the motivation guys

[babarasghar]

Still no success, it's still the same issue. I'm on windows and I'm using 3.0 beta. The problem is same, the cr2hdr when exports it overwrites the original dng (crested during ist import) but I can't then add the newly created dualiso dng. What am I missing here?

[DeafEyeJedi]

Are you using the LR plugin from @kichetof?

[babarasghar]

Are you using the LR plugin from @kitcheof?

finally some help
yes i am using the beta version

[Danne]

Audionut linked to this page already. There are two alternatives to try out besides lightroom. BArracuda and an postprocessing exe file.
http://www.magiclantern.fm/forum/index.php?topic=7139.0
Good luck. I,m on mac so can,t help you further.

[babarasghar]

Audionut linked to this page already. There are two alternatives to try out besides lightroom. BArracuda and an postprocessing exe file.
http://www.magiclantern.fm/forum/index.php?topic=7139.0
Good luck. I,m on mac so can,t help you further.

i have mac osx installed on my pc also, but i just tried in windows
when cr2hdr exports dng it renames it but lightroom is not updating its library n is showing old file. So i relocated it clicking that small exclamation mark on the thumb nail to relocate the DNG n reloaded it in library. Now artifacts are gone. I hope tomorrow morning ill take gud sunrise shots n will be able to share with u guys
Plz devs look into this, i was using V3.0 Beta 3 with Lightroom 5.7. I will now try 2.1 version lets hope this small error is not there.

cr2hdr: a post processing tool for Dual ISO images

Last update: 0eabcb0 on 2014-08-29 12:42:54 UTC by a1ex:
cr2hdr exposure matching: when all else fails, brute force prevails...

Active options:
--amaze-edge    : use a temporary demosaic step (AMaZE) followed by edge-directed interpolation (default)
--cs2x2         : apply 2x2 chroma smoothing in noisy and aliased areas (default)
--no-bad-pix    : disable bad pixel fixing (try it if you shoot stars)
--wb=graymax    : set AsShotNeutral by maximizing the number of gray pixels (default)

Input file      : C:\Users\babarasghar\Pictures\2015\2015-02-08\IMG_0832.dng
Camera          : Canon EOS 6D
Camera model    : Canon EOS 6D
Full size       : 5568 x 3708
Active area     : 5496 x 3670
Black borders   : 72 left, 38 top
Black level     : 2046
ISO pattern     : dBBd RGGB
White levels    : 15184 13783
Noise levels    : 4.69 7.86 7.97 4.70 (14-bit)
ISO difference  : 4.01 EV (1607)
Black delta     : 2.98
Dynamic range   : 11.45 (+) 10.52 => 14.53 EV (in theory)
AMaZE interpolation ...
Amaze took 2.07 s
Edge-directed interpolation...
Semi-overexposed: 30.99%
Deep shadows    : 17.02%
Horizontal stripe fix...
Full-res reconstruction...
ISO overlap     : 4.4 EV (approx)
Half-res blending...
Chroma smoothing...
Building alias map...
Filtering alias map...
Smoothing alias map...
Final blending...
Noise level     : 25.81 (20-bit), ideally 25.81
Dynamic range   : 14.99 EV (cooked)
Black adjust    : -16
AsShotNeutral   : 0.88 1 0.21, 2000K/g=0.64 (gray max)
Output file     : C:\Users\babarasghar\Pictures\2015\2015-02-08\IMG_0832.DNG (already exists, overwriting)
C:\Users\babarasghar\Pictures\2015\2015-02-08\IMG_0832.DNG: copying EXIF from C:\Users\babarasghar\Pictures\2015\2015-02-08\IMG_0832.dng

n here is final image

[limey]

Depending on your Lightroom version, after you export, it will only show the negative flagged original cr2 image. That is because you are in the LR develop mode. You have to switch from develop mode to library mode to see the new dual ISO dng in the same folder. It's a bug.

[babarasghar]

Depending on your Lightroom version, after you export, it will only show the negative flagged original cr2 image. That is because you are in the LR develop mode. You have to switch from develop mode to library mode to see the new dual ISO dng in the same folder. It's a bug.

i tried that also and even tried to exit lightroom even n relaunching it re-syncing the library
as i said im on LR 5.7 so will downgrading lightroom to like 5.4 5.6 etc will solve this issue?

[limey]

No...the only possibility I can think of, is that dual iso wasn't enabled for those pics? You see the bands if you zoom in 1:1?

[babarasghar]

some more developments
tried a landscape shot today
here is final version



Dual ISO DNG
https://www.dropbox.com/s/rradcr7tonrggv0/IMG_0868-dualiso.DNG?dl=0

Native ISO DNG
https://www.dropbox.com/s/3vnmsy2uimnnrkc/IMG_0862.dng?dl=0