M Monochrom and Adobe flat field plug in or CornerFix

[menos I M6]

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I am starting my first steps of learning about ways to handle extreme light falloff by lenses like the Carl Zeiss Hologon on the Leica M Monochrom.

 

Can people who use either technique share some tips regarding their workflow, specific to M Monochrom DNG files (I see issues, using these files with CornerFix, that might not be relevant to other DNG files).

 

So far my attempts with CornerFix ended with:

 

"Warning - CornerFix doesn't recognise the data format"

 

While my attempts with the Adobe flat field plugin ended at:

"Error

No calibration images detected!"

 

My goal is to find a way to remove the unnatural rectangular light falloff in files from the Mono specific to the digital sensor of the camera (M9 + MM) and leave the natural, smooth falloff, the lens provides (as in rendering on film).

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[250swb]

Cornerfix works very well as we know for colour files. But I have never been 100% happy with the 'formula', sometimes it works as planned, but sometimes my eye/brain say's I want something different, a bit more fall off perhaps.

 

I haven't tried Cornerfix with my MM files at all. With B&W we don't have the main problem which is colour cast that needs correcting at the same time as the fall off, so I just use the vignette tool in Silver Efex for my MM files that have a heavy natural vignette. Obviously it doesn't work to a formula unless you put the same values in each time, you need to work by eye. But you can change the shape of the vignette, go lighter or darker, and change the transition of the effect from narrow to wide. Once you get the hang of it making a heavy vignette lighter and the transition smoother is relatively easy.

 

 

Steve

[menos I M6]

Thanks Steve for the input.

 

My goal is to batch process the DNG files from camera to remove a distinct light falloff, added to the image by the digital sensor before importing the raw files into Lightroom.

 

I have spent many hours since I have the Hologon, to emulate this by specific development profiles in Lightroom itself, but the wanted effect is not universal and the labour involved, doing this one a image to image basis very tedious.

 

I never used Cornerfix, so I have high hopes here, it might be of help.

Unfortunately, I am stopped at the gate, since Cornerfix has issues with the MM DNG file format ?

[250swb]

I suspect it's because Cornerfix and Adobe are expecting an RGB file when you input a .dng, but the default profile is Greyscale. As you know you'd normally make your MM file into and RGB file for post processing when using ACR and not use the default profile, so perhaps you can input an RGB TIFF into Cornerfix to force it to 'see' three channels?

 

Steve

[sandymc]

CornerFix is primarily designed to fix "cyan corners" aka "red edge", so color artifacts. But it shouldn't have a problem with MM files. What's the sequence of operations you're following to get to that message?

 

Sandy

 

 

I am starting my first steps of learning about ways to handle extreme light falloff by lenses like the Carl Zeiss Hologon on the Leica M Monochrom.

 

Can people who use either technique share some tips regarding their workflow, specific to M Monochrom DNG files (I see issues, using these files with CornerFix, that might not be relevant to other DNG files).

 

So far my attempts with CornerFix ended with:

 

"Warning - CornerFix doesn't recognise the data format"

 

While my attempts with the Adobe flat field plugin ended at:

"Error

No calibration images detected!"

 

My goal is to find a way to remove the unnatural rectangular light falloff in files from the Mono specific to the digital sensor of the camera (M9 + MM) and leave the natural, smooth falloff, the lens provides (as in rendering on film).

[menos I M6]

Hey Sandy, here is some basic info:

 

MacBook Pro 15" retina

OS X 10.8.5

 

CornerFix

Version 1.4.2.0

 

Leica MM

FW 1.002

 

sequence:

 

1) open CornerFix

 

2) File/Open…

 

3) select file to open in dialogue

 

4) click OK button to open selected file

 

5) CornerFix opens file, but a popup warning displays:

 

"Warning - CornerFix doesn't recognise the

data format

 

You should try to convert to a Linear (demosaiced)

DNG - see the CornerFix web site"

 

 

And this is the point, where I am lost …

 

My next step was going to try with other DNG files (from other cameras), once I am back at my place.

[sandymc]

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Ok, 1.4.2.0 is quite old. First thing to do, upgrade to the latest version (1.4.2.4) here:

 

CornerFix | Free Security & Utilities software downloads at SourceForge.net

 

If that doesn't help, then send me the file you're having trouble with.

 

Sandy

[menos I M6]

Thanks for the update link Sandy!

 

I tried with the linked newest version, but the outcome is the same so far. I tried Leica S2 DNG files, which do work normally it appears.

[sandymc]

Ok, the CornerFix issue is resolved with V1.4.2.5, now available on SourceForge.

 

Sandy

[menos I M6]

Thanks Sandy, CornerFix version V1.4.2.5 loads MM files now ;-)

[RinoJasper]

Wow, nice results with the Hologon. I have the same lens it was converted by DAG camera but mounted on the M9 it's worthless - have a look.

Rino

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