03-11-2011, 11:35 AM
[quote name='mst' timestamp='1299841615' post='6678']
That doesn't change anything, because both dcraw and the DNG converter evolve over time.
-- Markus
[/quote]
Just to add - please remember that we do always mention that the test results are not cross-(test-)system comparable.
There're simply parameters which introduce variations into the final results:
- the style and layout of the test target
- AA filter
- sensor micro-lenses
- layout of the photodiodes
- bayer interpolation (demosaicing)
- AA filter-compensation sharpening
- quality of the analysis tool
As far as we are concerned a cross-system comparison can only be coarse at best and it's technically not valid.
Within a test system these individual parameters don't really matter - after all this is just a chain of multiplication factors - and whether you use 0% or 1000% for the USM or demosaicing engine A or B is, in the end, absolutely meaningless because it only affects the scale but not the quality of the numbers.
e.g.
Test parameter set A: center = 9, border = 5 (based on a presentation scale from 4 to 10)
Test parameter set B: center = 4.5, border = 2.5 (based on a presentation scale from 2 to 5)
The qualitative result of both test setups is identical. This is just an example for a linear factor but the same would be applicable for an exponential factor - as long as you remain within a single test environment it just does not matter on a qualitative level. The specific numbers are always a matter of interpretation - whether a dollar is little money or much money is dependent on your point of view.
That doesn't change anything, because both dcraw and the DNG converter evolve over time.
-- Markus
[/quote]
Just to add - please remember that we do always mention that the test results are not cross-(test-)system comparable.
There're simply parameters which introduce variations into the final results:
- the style and layout of the test target
- AA filter
- sensor micro-lenses
- layout of the photodiodes
- bayer interpolation (demosaicing)
- AA filter-compensation sharpening
- quality of the analysis tool
As far as we are concerned a cross-system comparison can only be coarse at best and it's technically not valid.
Within a test system these individual parameters don't really matter - after all this is just a chain of multiplication factors - and whether you use 0% or 1000% for the USM or demosaicing engine A or B is, in the end, absolutely meaningless because it only affects the scale but not the quality of the numbers.
e.g.
Test parameter set A: center = 9, border = 5 (based on a presentation scale from 4 to 10)
Test parameter set B: center = 4.5, border = 2.5 (based on a presentation scale from 2 to 5)
The qualitative result of both test setups is identical. This is just an example for a linear factor but the same would be applicable for an exponential factor - as long as you remain within a single test environment it just does not matter on a qualitative level. The specific numbers are always a matter of interpretation - whether a dollar is little money or much money is dependent on your point of view.