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Re: [OM] Talking about violet

Subject: Re: [OM] Talking about violet
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Sat, 10 Apr 2010 07:25:05 -0400
Sure looks pretty violet to me!

Chuck Norcutt


Jim Nichols wrote:
> Moose,
> 
> My E-1 loves violets.  I have posted this link previously.  It shows a mix 
> of conventional wild violets, along with the grey ones that, where we grew 
> up in Mississippi, were called Confederate Violets.
> 
> http://gallery.leica-users.org/v/OldNick/Violets.jpg.html
> 
> Jim Nichols
> Tullahoma, TN USA
> ----- Original Message ----- 
> From: "Moose" <olymoose@xxxxxxxxx>
> To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
> Sent: Friday, April 09, 2010 11:00 PM
> Subject: Re: [OM] Talking about violet
> 
> 
>> On 4/6/2010 2:47 AM, C.H.Ling wrote:
>>> After seeing the discussion about violet reproduction, I was a bit worry 
>>> if the later Olympus camera will have problem to see it. Here are some 
>>> shots taken for the same type of flower at different date but under 
>>> similar
>>> daylight (overcast) condition:
>>>
>>> E-1  http://www.accura.com.hk/temp/P3180419.jpg
>>>
>>> E-PL1  http://www.accura.com.hk/temp/P4060397.jpg
>>>
>>> 5D II  http://www.accura.com.hk/temp/IMG_1700.JPG
>>>
>>> 40D  http://www.accura.com.hk/temp/IMG_0806.JPG
>>>
>>> All converted from RAW with daylight balance, what do you think?
>>>
>> The difference in background, particularly brightness, makes visual
>> comparison pretty impossible for me. To get a semi objective measure of
>> difference, I selected the violet portion of the primary flower in all
>> four, expressly leaving out the very different, pinkish petal in the 40D
>> shot.
>>
>> I then averaged the selected area. Here are the color values:
>>
>> Channel   E-1    E-LP1    5DII     40D
>> --------------------------------------
>> Red       113     126      129     112
>> Green      32      42       29      37
>> Blue      146     150      144     142
>>
>> Assuming the E-1 is most accurate, per AG:
>>
>> Difference
>> Red                13       16      -1
>> Green              10       -3       5
>> Blue                4       -2      -4
>> Total              27       11       0
>>
>> Absolute Difference
>> Red                13       16       1
>> Green              10        3       5
>> Blue                4        2       4
>> Total              27       21      10
>>
>> The 40D is the clear winner in "E-1 emulation", with very small
>> individual deviations and an average deviation of zero. You are right to
>> be concerned about the E-LP1, as it's the farthest off.
>>
>> Certainly nothing absolute in all this. You don't say what RAW
>> converter(s) were used. In the case of ACR, the default conversion
>> depends on some values drawn from test shots of targets, so RAW
>> conversion probably says more about ACR than the camera itself, at least
>> at this level of subtlety.
>>
>> It might be interesting to compare JPEGs and/or RAW conversions using
>> Oly software for their camera and Canon's DPP for theirs. or did you do
>> that?
>>
>> A. Violet Moose
>> [Just one letter away from trouble.]
>> -- 
>> _________________________________________________________________
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>>
>>
> 
> 
-- 
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