Processing RAW files in Linux
In this article I’m going to show the benefits of storing the photos in RAW “format”. I’ll be also decribing GNU/Linux tools that can help you with processing such images.
The term RAW, used in the field of digital photography, comes from English and has the same meaning as “raw”. It is common for manufacturers to supply customers with software for decoding their proprietary software.
Decoding is not an easy thing to do, because the light-sensitive points on an array (CMOS or CCD) do not sense colors, only light intensity (the light is filtered separately for each primary color), which means creating a “mosaic” image in the camera. The camera then has to process the image in such manner, as to provide each pixel with full information about the color (based on the neighboring monochromatic points). It is also necessary to correct the white balance, and some cameras also adjust the contrast and saturation. The electronic hardware in the camera has thus a plenty of complex operations to accomplish after the shutter button is pressed.
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