Understanding RAW File Format

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Understanding RAW File Format

Date Added: January 15, 2010 08:55:28 AM

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When you take a picture in JPEG file format with your digital camera, a couple of things happen before the image is even saved to memory card:

The image sensor gathers the information from its photosites, converts it from analog to digital, and holds it for further processing. At this stage, the image data captured can be thought of as being "unprocessed" -- or, RAW data.
If you have specified white balance, sharpening, contrast, saturation, image effect, digital zoom, etc., these are applied to the RAW data.
If you have specified image quality and size, these are also applied to the RAW data.
The resulting image is a JPEG image, processed ("in-camera process"), and compressed, which is then written to your memory card.

After you have transferred the image from your memory card to your PC, you may decide to further process it ("post-processing") in an image editing software, such as Photoshop. Most photographers will usually adjust levels and sharpen the image a bit.

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