Fresh Dew on a Rose

by adarsha joisa

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Welcome to the "Photoshop Tax" on getting a new camera body. The main thing to keep in mind is that RAW is not an acronym, a file format, or a standard. It's merely a file that contains the unprocessed (raw) contents of a sensor data dump. Every camera model has a different RAW file format. The .CR2 files from a 5DMKII are different from the .CR2 files ...


This accounts for nonlinearity in human perception of brightness. This page, citing Williamson & Cummins (1983), explains: In considering this question we can replace "reflectance" with "exposure." Note that the response curve has a roughly constant slope for all but the darkest range.


I found that the recording of the darkest areas was itself nonlinear. The blacks taper off giving a much larger range, with bigger steps between each value. My experiment was done many years ago, but that might (still) be an inherent property of the sensor technology. (That would mean that a well has a harder time registering a hit when it is empty)

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