M8 Cyan corner correction by software ?

[MP3]

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Hi Folks

 

I've taken some shots with my M8 and ZM21/2.8 combo just yesterday. WIth 486 filter on the lens, the cyan corners or red vignetting is rather obvious.

 

I would certainly agree the 6-bit coded lenses and firmware v1.10 are the official leica solutions. Apart from the DIY sharpies coding and bayonnet change, could anybody shed me some light on,

 

- whether this red vignetting issue could be deal with some current post-processing software?

- And if that is possible, which software would give the best results in terns of IQ and easy of use?

 

Since I got my M8, I have been working with C1 LE, for me it is quite user friendly. I have not much experience with PS CS2 or other raw converters.

 

Thanks a lot for your kind inputs.

 

Best

Matthew

[MP3]

I made a google and happened to learn the Panorama Tools & its Radial Luminance Correction Plug-in, seems launched by epaperpress.

 

Does anybody here have experience using this software plug-in and would shed us some light on, where could we find some tutorial material on this workflow.

 

Thank you very much for your kind advice.

 

Cheers

Matthew

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[robsteve]

Just tried panorama tools to correct the cyan corners and it works great and quickly. I am not sure if it works on a Mac in 16bit. this it the link to the 16bit plugins.

 

 

Panorama Tools Plug-ins (16-bit)

 

 

The attached file was done with 10 in the red field of radial luminance under the PTcorrect plugin. This was shot with my old 28mm elmarit. I didn't play with the values much, 10 for red was the second attempt.

 

 

[robsteve]

I played with the radial luminace correction a bit more. This one had the RGB values of Radial luminance as 8,2,2. I assume by adding some adjustmnt to the ble ang green, I am do a general vignett correction of RGB 2,2,2 and then 6 extra on the red.

 

[MP3]

Dear Robert

 

Thank you very much for your samples. Seems a nice afternoon. They do have the cyan corners improved or removed. There is also a slight color change in the center of the picture (less red in the center).

 

I read from the web materials that 8,2,2 will impose 4,1,1 at the corners and -4,-1,-1 at the center and a gradient change between corners and center of image. To improve the corners without affecting the center will need some mask and layering technique which is certainly out of my PS knowledge. Hope I can master them bit by bit.

 

Thanks again for your input =)

 

Cheers

Matthew

[Guest guy_mancuso]

I have got to get this onto my Mac. for some reason not sure i have the right software on this. Any help hear would be great ,I'm on a MacPro

[LJL]

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Guy,

Panorama Tools does not run on Macs, only PCs. There is another version of things done by a software company called Kekus, but it appears to be mostly for doing the panoramic stitching and such that Pano Tools originally started out doing. I have not found anything else yet that works like Pano Tools for use on a Mac, besides DxO, which is way more pricey, and probably does not yet have lens modules built for Leica M lenses. I really am not sure about this, however.

 

LJ

[Guest guy_mancuso]

Damn L.J that was not the best news of the day my friend. I guess will have to look for something else than

[LJL]

Just thought about a very convoluted workaround for the Mac.....you would have to install Parallels and Win XP, and then Pano Tools. That would then give you the ability to run both systems in separtate windows on the the Mac OS, and pass files from one to the other. (That last part is a bit cumbersome, but getting better.)

 

Still think the solution needs to be built into C1 and/or within the Leica in-camera firmware, and accessed via menu for use with non-coded lenses. This, to me, is still the best way to do this, but several of us have been saying that for some time now.

 

LJ

[roberth]

does corner cyan contamination change with f-stop? hopefully not a dumb question.

does it change with light source?

[Guest guy_mancuso]

Just thought about a very convoluted workaround for the Mac.....you would have to install Parallels and Win XP, and then Pano Tools. That would then give you the ability to run both systems in separtate windows on the the Mac OS, and pass files from one to the other. (That last part is a bit cumbersome, but getting better.)

 

Still think the solution needs to be built into C1 and/or within the Leica in-camera firmware, and accessed via menu for use with non-coded lenses. This, to me, is still the best way to do this, but several of us have been saying that for some time now.

 

LJ

 

 

Yes i agree it should be in C1 and hoping it does with 4.0 and also with leica firmware .

 

I could do the PC thing with Parallels, which i actually have the first version of it which i know has been seiously upgraded since. What a PITA though. Good suggestion

[dhoelscher]

Hey Guy,

 

The Kekus version of the Panotools plug-in for MacOS DOES have the radial luminance corrective option.

 

See this web page: Kekus Digital - Panorama Tools for OS X :: LensFix and Panorama Tools plug-ins

 

Of course, since this isn't a universal binary, it must run in Rosetta on a Mac Pro, and this means that you must launch photoshop to run in Rosetta (even if running the new CS3 beta) so that the plug in can live.

 

I'm gonna give this a try this afternoon.

 

DH

[LJL]

David,

This is a great find. Not sure how I missed this earlier, but glad that you brought it into play. This could be a viable workaround for many of us for a while. The problem of running it in Rosetta is a bit of a pain for those with Intel Macs, but at least there is a solution. I imagine that if a few folks start asking about a Universal Binary version for the plug-ins, one will be on the way. (Since it is a PS plug-in, they really would only be releasing a beta of it, most likely, until Adobe turns out CS3 version in UB. Would still be worth having to use in the beta version of PS running on Intel Macs now.)

 

Thanks again for pointing this out, and do let us know what you find out in your testing.

 

LJ

[wparsonsgisnet]

does corner cyan contamination change with f-stop? hopefully not a dumb question.

does it change with light source?

 

Robert, as I understand it, the cyan-drift does not change but the vignetting does. The change in the vignetting makes the cyan look different even tho it doesn't change.

[dhoelscher]

David,

This is a great find. Not sure how I missed this earlier, but glad that you brought it into play. This could be a viable workaround for many of us for a while. ...

 

Thanks again for pointing this out, and do let us know what you find out in your testing.

 

LJ

 

Wow !

 

I downloaded the plug in set from Kekus - installed it into Photoshop - and tried it on 486 filter images from:

 

1) Zeiss 15mm f/2.8 distagon (NO coding)

2) CV 15mm Heliar (NO coding)

3) CV 12mm Heliar (NO coding)

 

and I like the results. Yahoo, I'm beginning to think I can tolerate color images from the Zeiss and CVs with the 486 filter in place even without Sharpie coding, etc. (the B&W images really looked just fine as Sean says)

 

Disclaimer for Guy: I don't have a Mac Pro like you do, so I did my testing with my bogus old Quad G5 Mac .......

 

DH

[roberth]

thank you Bill. A PS action to correct colour with an added mask may be enough for the cyan, the vignetting I am not worried about as I usually add some to my photos anyway.

[Guest guy_mancuso]

Wow !

 

I downloaded the plug in set from Kekus - installed it into Photoshop - and tried it on 486 filter images from:

 

1) Zeiss 15mm f/2.8 distagon (NO coding)

2) CV 15mm Heliar (NO coding)

3) CV 12mm Heliar (NO coding)

 

and I like the results. Yahoo, I'm beginning to think I can tolerate color images from the Zeiss and CVs with the 486 filter in place even without Sharpie coding, etc. (the B&W images really looked just fine as Sean says)

 

Disclaimer for Guy: I don't have a Mac Pro like you do, so I did my testing with my bogus old Quad G5 Mac .......

 

DH

 

 

Thanks so much for trying this out David , I am going to certainly try loading it in CS2 . I think i tried in CS3 beta and maybe the reason it did not work. I can work easily with CS2 in Rosetta , this unit has a lot of horsepower . So really it is not that slow. Hope to get this loaded on Thursday or Friday when I get a day off here. Thanks again. This is certainly a fix for the cyan drift until the firmware can do it