Advanced RAW photography in Linux
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Alexander Tolstoy hides secret messages in underexposed parts of his photos. There are much easier ways to order pizza, though.
Shooting in RAW opens up a whole world of new possibilities in digital photography. RAW images contain more information about colours that we can use to improve image quality. In the first part of this tutorial we fixed exposure, white balance and grain noise. This time we’re moving forward with another set of improvements, specifically chromatic aberrations, dynamic range compression and local adjustments. We’ll also explain how to remove unwanted vignetting and haze.
Even though digital cameras are getting better all the time and their firmware algorithms deliver perfectly acceptable results in Auto mode, there are still image-editing tasks that you can do better manually. Note that this tutorial isn’t tied to a specific RAW processing software. There are lots of applications to choose from in Linux, after all. It’s far more important to get used to the techniques involved and understand which tools can help you achieve the best results.
Chromatic aberration
Chromatic aberration is a type of lens distortion when boundaries of an object have an unusual colour outline – often cyan, purple or yellow. Such defects occur).
