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Why are the DNG files generated by DxO OpticsPro bigger than the original RAW files ?

In order to apply its corrections, DxO Optics Pro has to “demosaic” the RAW image. The DNG file generated by DxO Optics Pro is therefore a “demosaiced” DNG file, which is by nature three times larger because it contains three times as much color information per pixel.

Explanatory note: A RAW file contains only a single kind of information about color per pixel (red, green, blue), whereas a “normal” image consists of three kinds of information about color per pixel. The operation that finds and adds the two other kinds of information about color is called “demosaicing.”

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