Author Topic: Dual ISO processing strangeness  (Read 1202 times)

garry23

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Dual ISO processing strangeness
« on: September 26, 2019, 06:47:26 PM »
I have a very stable Lightroom set up, that processes Dual ISOs seamlessly, until today.

I took a load of duals on my 5D3 and all of the images processed ok, as usual, other than half a dozen that refused to process.

I shot at 100/1600 and you can clearly see these are duals.

The LR plugin says, no dual, and doesn’t process these few images.

As I say, I’ve never seen this before.

Has any one got any insight.

Cheers

Garry

IDA_ML

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Re: Dual ISO processing strangeness
« Reply #1 on: September 26, 2019, 07:01:21 PM »
I had similar problems with Lightroom skipping frames when processing large Non-Dual ISO DNG sequences.  I never found the reason why that happens.  My suggestion is to use MLVApp for processing your Dual ISO files.  I does an excellent job with that while allowing for very precise color grading after  conversion.

Walter Schulz

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Re: Dual ISO processing strangeness
« Reply #2 on: September 26, 2019, 07:12:03 PM »
LR has no saying in Dual-ISO-processing. It's entirely a cr2hdr thing. And cr2hdr may do false rejection with specific Dual-ISO pics.
But the tip giving MLVapp a try is indeed a good one.

garry23

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Re: Dual ISO processing strangeness
« Reply #3 on: September 26, 2019, 07:14:16 PM »
Thanks to both of you for your suggestion.

I look into MLVApp.

Cheers

Garry

garry23

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Re: Dual ISO processing strangeness
« Reply #4 on: September 26, 2019, 07:27:55 PM »
 ???

First problem I see is that I have single .cr2 dual-iso files, but MLVApp appears to want to see .mlv files.

Any hints?

histor

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Re: Dual ISO processing strangeness
« Reply #5 on: September 26, 2019, 08:03:26 PM »
Have you tried some --force?
Code: [Select]
cr2hdr.exe --force IMG.CR2

garry23

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Re: Dual ISO processing strangeness
« Reply #6 on: September 26, 2019, 08:07:38 PM »
Sorry, I know you are trying to help, but you are a little too cryptic for me  ;)

As I say, I have normal, single image duals, and all I wish to do is open and process them in MLVApp.

Danne

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Re: Dual ISO processing strangeness
« Reply #7 on: September 26, 2019, 08:11:19 PM »
Mlv app isn´t working with files other than MLV. If on mac Switch works by simple drag drop.

garry23

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Re: Dual ISO processing strangeness
« Reply #8 on: September 26, 2019, 08:14:34 PM »
@Danne

Thanks: that's what it looked like.

So I'm still mystified why the LR Dual-ISO app doesn't process these few images, when they are clearly Duals

 :(

garry23

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Re: Dual ISO processing strangeness
« Reply #9 on: September 26, 2019, 08:15:52 PM »
BTW

What triggers Dual-ISO post processing?

Meta data?

EXIF data?

Or what?

Danne

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Re: Dual ISO processing strangeness
« Reply #10 on: September 26, 2019, 08:31:44 PM »
Throw one file up there for testing.

histor

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Re: Dual ISO processing strangeness
« Reply #11 on: September 26, 2019, 08:34:01 PM »
I referred to windows version of cr2hdr-20bit
https://builds.magiclantern.fm/jenkins/view/Other%20tasks/job/cr2hdr-20bit/

Sometimes it ignores the files
Code: [Select]
Doesn't look like interlaced ISO
ISO blending didn't work

Running it with the --force option you get blended DNG plus information from the log like this
Code: [Select]
offset too largeYou may get stripes at some lines finally (in the highlights, I believe).

garry23

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Re: Dual ISO processing strangeness
« Reply #12 on: September 26, 2019, 09:20:24 PM »
@histor

Many thanks for the education.

Managed to process the images, but strange that LR version decided to give up.

Cheers

Garry

histor

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Re: Dual ISO processing strangeness
« Reply #13 on: September 26, 2019, 09:32:47 PM »
May the --force be with you  ;)

Walter Schulz

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Re: Dual ISO processing strangeness
« Reply #14 on: September 26, 2019, 09:36:17 PM »
Managed to process the images, but strange that LR version decided to give up.

There is no "LR version". You have enough lua knowledge to add an --force option into plug-in's GUI.

garry23

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Re: Dual ISO processing strangeness
« Reply #15 on: September 26, 2019, 09:40:49 PM »
@Walter Schulz

You give me far too much credit.

I’m a simple Lua scripter.

Walter Schulz

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Re: Dual ISO processing strangeness
« Reply #16 on: September 26, 2019, 11:14:49 PM »
I’m a simple Lua scripter.

That will do!

garry23

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Re: Dual ISO processing strangeness
« Reply #17 on: September 28, 2019, 09:02:00 AM »
Back home now from my travels, so I thought I would be clear on what happened.

Using the LR version fails on certain images.

Using the desktop .exe version, ie dropping the image onto the  cr2hdr.exe, without using force, works ok.

In other words, it looks like to me that something strange is happening with the LR based approach.


garry23

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Re: Dual ISO processing strangeness [FIXED]
« Reply #18 on: September 28, 2019, 09:14:33 AM »
If anyone else has this random problem with the LR ‘version’ of cr2hdr.exe, here is how I fixed it.

The issue is that the you get the message that the image is not a dual and the image is not processed.

If you get this, click on the keyword icon in the image review and delete the keyword message that will be there, ie not dual iso.

Then reprocess again.

Walter Schulz

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Re: Dual ISO processing strangeness
« Reply #19 on: September 28, 2019, 10:17:08 AM »
This is not a solution and not a workaround but just random and won't do the trick for all affected pictures

garry23

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Re: Dual ISO processing strangeness
« Reply #20 on: September 28, 2019, 10:30:14 AM »
@Walter Schulz

Maybe I didn’t make myself clear. It appears to fix the problem IF LR refuses to process a dual.

...at least for me ;-)