Archived posting to the Leica Users Group, 2007/03/06

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]
Subject: [Leica] IR Filters; Rain and Sun
From: lists at mcclary.net (Harrison McClary)
Date: Tue Mar 6 06:55:08 2007
References: <C20E07D6.9EF1%robert.rose@mac.com> <p06230901c20e9e0b4ab5@[10.1.16.129]>
 
Does this still occur if you do not use auto White balance? 

Henning Wulff wrote:
>
> I think you will find that the center of the image is more magenta 
> than the corners. This has been referred to as a 'cyan drift'. The 
> central magenta look is actually correctly filtered but looks magenta 
> because the auto WB averages things out, and the cyan corner 
> conditions are the result of the oblique rays filtering not just IR 
> but also visible magenta. This effect can be corrected in software, 
> whereas the IR sensitivity can't.


-- 
Harrison McClary
Harrison McClary Photography
harrison@mcclary.net
http://www.mcclary.net
ImageStockSouth - Stock Photography
http://www.imagestocksouth.com
Tobacco Road: Personal Blog:
http://www.mcclary.net/blog
Replies: Reply from drodgers at casefarms.com (David Rodgers) ([Leica] Digging deeper)
Reply from henningw at archiphoto.com (Henning Wulff) ([Leica] IR Filters; Rain and Sun)
 In reply to: Message from robert.rose at mac.com (Robert Rose) ([Leica] IR Filters; Rain and Sun)
Message from henningw at archiphoto.com (Henning Wulff) ([Leica] IR Filters; Rain and Sun)