Archived posting to the Leica Users Group, 2006/12/21

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Subject: [Leica] IMG: Another Comparison - M8 correction in PS
From: walt at waltjohnson.com (Walt Johnson)
Date: Thu Dec 21 11:17:51 2006
References: <7.0.1.0.2.20061220133550.024a1f90@infoave.net> <BAY116-F29E75FF42459665AC25AAE9FCE0@phx.gbl> <6.2.1.2.2.20061221094953.047d1820@mail.infoave.net> <458AD363.4040103@waltjohnson.com> <458ADB05.60200@gmx.de>

Douglas

That's what I assumed as well. I fiddled with the flag/candle shot and 
it looked much better. Still, there are some serious issues to be 
concerned about. I just read Leica's press release and was not 
encouraged.  It could easily have come from the Bush White House and 
that's not an exaggeration.

Walt

Douglas Sharp wrote:

> Tina, Walt,
> Photoshop can! Well very nearly.
> Try Hue/Saturation - select red and shift the hue to around +30, then 
> go to magenta and shift it to the same value, play about with the 
> magenta saturation until it looks right (about + 8) . It gets close to 
> the "true" Canon colours (with the exception of the yellow fringe on 
> the flag). There is a slight residual yellowish cast that shouldn't be 
> too hard to get rid of.
> This does however imply that something is VERY much off track in the 
> colour spectrum.
> To those more expert out there - how do you convert these values to a 
> custom PS Filter?
> Douglas
>
>
> Walt Johnson wrote:
>
>> Tina
>>
>> I though Photoshop could correct just about any color shift? I was 
>> trying with the Underwater filter and it seemed to help.
>>
>>
>> Walt
>>
>> Tina Manley wrote:
>>
>>> At 08:26 AM 12/21/2006, you wrote:
>>>
>>>> Please note that changing WB after the fact cannot fix the IR 
>>>> problems--the IR contamination shifts the colors of objects 
>>>> differently, depending on how much they reflect IR. Synthetic black 
>>>> goes to magenta.  Synthetic green goes to gray, and so forth.
>>>>
>>>> Mark Davison
>>>
>>>
>>>
>>> Right, Mark!  I've discovered that no amount of color balancing in 
>>> photoshop can correct the strange colors.  Capture One seems to do 
>>> the best job with the Leica DNG files but it's still way off.  I 
>>> hope the IR filters will correct this and am encouraged to find out 
>>> that they don't cut the light any.
>>>
>>> Tina
>>>
>>> Tina Manley, ASMP, NPPA
>>> http://www.tinamanley.com
>>>
>>> _______________________________________________
>>> Leica Users Group.
>>> See http://leica-users.org/mailman/listinfo/lug for more information
>>>
>>
>> _______________________________________________
>> Leica Users Group.
>> See http://leica-users.org/mailman/listinfo/lug for more information
>>
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
>

In reply to: Message from images at InfoAve.Net (Tina Manley) ([Leica] IMG: Another Comparison)
Message from davison_m at msn.com (MARK DAVISON) ([Leica] IMG: Another Comparison)
Message from images at InfoAve.Net (Tina Manley) ([Leica] IMG: Another Comparison)
Message from walt at waltjohnson.com (Walt Johnson) ([Leica] IMG: Another Comparison)
Message from douglas.sharp at gmx.de (Douglas Sharp) ([Leica] IMG: Another Comparison - M8 correction in PS)