what's its use,, and wat does it actually
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Most every digital camera can create a JPEG image, which is the camera's best guess at the processed outcome - it's like taking a Polaroid where there is no negative and the picture comes out automatically. In contrast, raw mode, which has a different extension by make (i.e., .NEF for Nikon), is the unprocessed image information as it was collected by the camera's sensor - like a film negative. By taking RAW images, you have the information that programs, like Adobe Lightroom and Photoshop, can use to adjust the final outcome of the image. So, like when processing a film negative, you can adjust the exposure, temperature, tint, etc.27 June 2012
I have my cameras set to take both raw and JPEG. I have the complete information for my purposes, but also have something for a customer to see right away.