Archived posting to the Leica Users Group, 2006/06/03

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Subject: [Leica] Mapping - CS2 filters
From: Jim at (Jim Hemenway)
Date: Sat Jun 3 08:33:35 2006
References: <> <>


You're right... Photoshop CS2 already has a filter which enables me to 
quickly remove the vignetting produced by the edge light fall off of my 
wide angle 210mm lens on the 11x14.


I wouldn't be able to use the lens otherwise because when I went 
looking, Size VI center filters, (about 135mm wide) are available only 
to the rich!

CS2 has a nifty chromatic aberration filter as well.

I upgraded from PSP 7 so, for all that I know, the feature may also be 
available in CS1.


Lawrence Zeitlin wrote:

> On Jun 3, 2006, at 8:53 AM, Frank wrote:
>> I Agree with Don on the mapping concept, and telling the camera which 
>> lens is on the camera is the new piece of data the camera
>> needs to accomplish that bit of digital imagery.  What is on the 
>> "chip"?  "Serial number" of the lens?  FL of the lens?  Either can
>> be used to accomplish the goal.  It depends on whether the camera can 
>> do the mapping or if mapping is done at the factory.  A neat
>> side issue on the mapping concept is that you might be able to map 
>> Bokeh, or even different Bokeh to the same piece of glass....
>> Can you imagine putting 1932 50 Elmar Bokeh onto a 90 APO Summicron?
>> And now, it is time to wait for the trolls of Solms and the 
>> programmers located somewhere else in the world ( maybe) to do their
>> thing and impress us.
> There is no inherent reason why mapping and software correction of a 
> digital image cannot be used to remove all sorts of geometric 
> abberations and uneven illumination. Indeed, a Photoshop plug in for 
> each specific lens could do the job. Some early ultra wide angle lenses 
> did this in an analog way by using a graduated filter to correct for 
> light fall off at the edges of the frame. Your eye does this by adaptive 
> correction of the highly distorted image on the retina. Leica may, at 
> last, be entering the 21st. century.
> Larry Z

Replies: Reply from red735i at (Frank Filippone) ([Leica] Mapping - CS2 filters)
In reply to: Message from lrzeitlin at (Lawrence Zeitlin) ([Leica] Re: Mapping)