Originally posted by scottDee Data is measured from raw files taken to my specifications and contributed by people from around the world.
Originally posted by scottDee Looks like a serious, motivated guy. He deserves many thanks.
Yes, he is definitely serious.
The analysis is both simple and complex. The simple part is that Bill Claff works from the numeric data stored in the RAW files for captures done under standard conditions. The RAW files are user-submitted. The complex part is how he infers NR, scaling, and so on from a set of numbers since the data are essentially opaque with no explicit clues as to what modifications have been applied in the A/D conversion and initial scaling to 12 or 14 bit digital.* For the patient, he includes a primer on the P2P site:
Sensor Analysis Primer
(Actively wondering why a tech-savvy site would continue to use characters that render as � ?)
FWIW, P2P is followed closely by PentaxRumors and associated rumors sites as a source of a steady trickle of rumorable information. They are also widely cited and debated on digital photography forums when subjects such as base ISO come up, though it is often not clear what the charts actually say.**
Steve
* All data are scaled at least to arbitrary clipping values for black and white as part of the A/D conversion. It is the choice of those values that heavily influence capture character.
** My pet peeve is comparing performance at a particular ISO with the inference that the numbers mean the same across brands...they don't.
Last edited by stevebrot; 12-10-2018 at 10:20 AM.
Reason: punctuation