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[OM] Re: Comparison shots

Subject: [OM] Re: Comparison shots
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Sat, 01 Nov 2008 08:59:21 -0400
I agree.  B is the Portra scan and A is from the E-510 and 14-54. 
Ignoring Nathan's practical comments about which picture the mothers 
will prefer and dealing only with technical image quality issues:
A is to be preferred for sharpness and saturation. I think B is 
undersaturated relative to the original scene but nevertheless probably 
closer to the original... which is what Portra NC attempts to do.  A 
(the 14-54) still shows some distortion not shown by the 50mm Mamiya 
(see image A at 100%, shape of the heads of the group of children in the 
foreground).  The 50mm did a better job in that respect but PTLens could 
probably improve the 14-54 shot with a proper profile.  B is not only 
undersaturated but under sharpened.  The image improves considerably 
after applying some LCE and more sharpening.  I think the Portra shot 
could be made to at least equal the 510 shot (if not surpass it) with an 
improved scan (on the same scanner) and post processing.

But it does make you wonder why one would haul around an RB-67 and go to 
all this labor and expense when (for modest size prints at least) one 
gets a very good result nearly straight out of the 510 and at far lower 
cost.

Chuck Norcutt


James R wrote:
> B is definitely the scan - the colours are a bit off, especially the  
> reds, and it reminds me of how frustrating scanning is. Does Vuescan  
> still have all those weird film types and none of the ones that you  
> might actually use?
> 
> A looks better but, ignoring the limited attention of the subjects, I  
> wonder if the same would be true if you looked at a print from the neg?
> 
> James
> 
> On 1 Nov 2008, at 05:13, Wayne Harridge wrote:
> 
>>
>> http://lrh.structuregraphs.com/images/group-a.jpg
>>
>> http://lrh.structuregraphs.com/images/group-b.jpg
>>
>>
>> One of these images:
>>
>> Olympus E-510, 14-42mm @14mm, ISO 400, 1/125, f8
>>
>> the other:
>>
>> Mamiya RB-67 Pro-S, 50mm, Portra 400NC, 1/125, f8, scanned (vuescan)
>> @2400dpi on Epson V700, some adjustment to colour balance & contrast.
>>
>> Both images had perspective correction as I was shooting from the  
>> top of a
>> 2m step ladder, cropping, resize to 2400 wide and same basic  
>> sharpening
>> before uploading to the site.
>>
>> Ok, so which image is E-510 ?
>> Which one do you prefer ?  (whatever your criteria happens to be)
>> Why ?
>>
>> ...Wayne
>>
>>
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