There's an article about image quality on wikipedia which contains some 
references that might be useful, including one about information theoretic 
approaches to image quality assessment. 

http://en.wikipedia.org/wiki/Image_quality. 

There's also a link to a commercial site which offers products for measuring 
quality factors: 

http://www.imatest.com.
http://www.imatest.com/docs/iqfactors/

B



> On 30 Dec 2013, at 18:04, Bob W <[email protected]> wrote:
> 
>> On 30 Dec 2013, at 17:56, Ciprian Dorin Craciun <[email protected]> 
>> wrote:
>> 
>>> On Mon, Dec 30, 2013 at 7:48 PM, Bob W <[email protected]> wrote:
>>> Consider the following pictures, for example, which all show a Frenchman 
>>> riding a bicycle, but which are very different technically. Which one is 
>>> the best? Why?
>> 
>>   This is a trick question...  :D
>> 
>>> B) 
>>> http://metmuseum.org/Collections/search-the-collections/286639?rpp=20&pg=1&rndkey=20131214&ao=on&ft=*&where=France&who=Henri+Cartier-Bresson&pos=7#fullscreen
>> 
>>   Because the answer is most likely (B), made by HCB.  :)  (I know
>> the fable about Flickr group that dismissed this photo as unsharp.)
> 
> It is a trick question, but the answer is not B. The answer is 'it depends on 
> what the picture is for'.
> 
>> 
>>   However indeed it proves a point:  for some photos "correctness"
>> doesn't matter, it's all in the moment or "look-and-feel".  (Even I
>> have a few "failures" that I find better when compared with their
>> "correct" equivalents.)
>> 
>>   But still, for landscape or macro photography (which seems to be
>> my main interest), I still find sharpness and correct exposure very
>> important.
>> 
>>   Ciprian.
>> 
>> 

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