Archived posting to the Leica Users Group, 2005/06/03

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Subject: [Leica] DMR RAW files for download, NOW: Fringing.
From: leica_korenman at hotmail.com (eric korenman)
Date: Fri Jun 3 05:57:25 2005

But what about the color fringing?
Isn't it awfully prominent at high contrast borders?
Do the D2x and MKII exihibit this degree of fringing?

Eric


>From: Douglas Sharp <douglas.sharp@gmx.de>
>Reply-To: Leica Users Group <lug@leica-users.org>
>To: Leica Users Group <lug@leica-users.org>
>Subject: Re: [Leica] DMR RAW files for download, NOW: Fringing.
>Date: Fri, 03 Jun 2005 13:19:58 +0200
>
>Hello Mikiro,
>try auto colour correction on the dragonfly picture and see if it shifts to 
>blue, it did when I ran it in PS Elements 3.0.
>
>I agree about the quality, I think it resembles more the shots from the 
>Olympus P&S digicamera my wife uses more than what I'm used to getting from 
>a Canon 20D or 300D. Are the images losing something during transfer from 
>the linked site?
>
>I've just compared a few parameters between 20D and DMR files
>
>DNG file size 19.4MB converts to TIFF 28.7 MB
>CR2 file size  8.4MB converts to TIFF 23.4 MB
>
>Unless my way of thinking is terribly wrong I make that a compression 
>factor of 1.48 for DNG and 2.8 for CR2, so you would be getting a lot more 
>CR2 files on your storage card.
>The relative sizes are, at 240 dpi
>DMR 3876x2584        Canon 20D 3504x2336  pixels
>DMR 41.02x27.35cm    Canon 20D 37.08x24.72cm  print size at 240dpi
>
>Both files do have an aspect ratio of 1,5 (2:3 format) so nothing has been 
>cropped here. The Leica file is in effect 1.2 times larger than the Canon 
>file, so somebody is being not quite accurate with the factors 1,37 and 1,6 
>quoted for the crop factors, this should work out as 1.16
>
>So in non-mathematical language the full resolution print size advantage  
>you get with a Leica DMR file is 20%, sounds quite reasonable until you see 
>that the print is then only 3.9cm longer (1.55 inches) and 2.6cm higher 
>(1.03inches) at the same resolution of 240dpi.
>
>Probably all a waste of time , but somebody may find the figures 
>interesting.
>Cheers
>Douglas
>
>
>MIKIRO wrote:
>>Douglas,
>>
>>I played with the image files on Photoshop. To my eye they look as if they 
>>had been taken with a smaller digicam, which may suggest the limited 
>>dynamic range you feel and/or possible problems of the lenses used. I do 
>>not see a massive shift to the blue channel but a tone similar to those I 
>>saw with Panasonic/Leica digicams.
>>
>>Cheers,
>>
>>MIKIRO
>>Japan
>>
>>Douglas Sharp wrote:
>>
>>>I downloaded the church and the dragonfly <nd ran them through PS with 
>>>acouple of simple standard processes, levels. contrast, auto colour 
>>>correction. Also through a couple of plug-ins like ColorCastFX.
>>>The reaction of the dragonfly shot to processing is disturbing, I get the 
>>>impression that there is a very limited dynamic range on these files, and 
>>>a tendency to a massive shift to the blue channel.
>>>Can anyone else confirm this so that I can be sure that it's not me 
>>>making mistakes.
>>>Douglas
>>>
>>>B. D. Colen wrote:
>>>
>>>>And a 100 iso image at that.
>>>>
>>>>
>>>>On 6/2/05 7:20 PM, "eric" <leica_korenman@hotmail.com> wrote:
>>>>
>>>>
>>>>>Interesting - the color fringing problem is pretty darn severe on some
>>>>>images.
>>>>>Look at "Kapuzinerkirche Salzburg" and look at the light fixture on the
>>>>>upper left.
>>>>>Very prominent color fringing is evident.
>>>>>
>>>>>Eric
>>>>>
>>>>>>
>>>>>>----- Original Message -----
>>>>>>From: "Douglas Herr" <telyt@earthlink.net>
>>>>>>To: <lug@leica-users.org>; <leica@freelists.org>;
>>>>>><leicareflex@freelists.org>
>>>>>>Sent: Thursday, June 02, 2005 6:06 PM
>>>>>>Subject: [Leica] DMR RAW files for download
>>>>>>
>>>>>>
>>>>>>
>>>>>>>Several sample RAW files in DNG format are available on Peter 
>>>>>>>Werner's
>>>>>>>website (not dial-up friendly):
>>>>>>>
>>>>>>>http://www.leicaphoto.net/Download/DMR_Raw/index.html
>>>>>>>
>>>>>>>
>>>>>>>Doug Herr
>>>>>>>Birdman of Sacramento
>>>>>>>http://www.wildlightphoto.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



Replies: Reply from douglas.sharp at gmx.de (Douglas Sharp) ([Leica] DMR RAW files for download, NOW: Fringing.)
Reply from creativevisions at verizon.net (Michael J Herring) ([Leica] DMR RAW files for download, NOW: Fringing.)
In reply to: Message from douglas.sharp at gmx.de (Douglas Sharp) ([Leica] DMR RAW files for download, NOW: Fringing.)