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RAW

RAW is an entirely new approach to image capture. Rather than simply capture the data from the image sensor, then write it to memory as a file format, RAW files instead save all the metadata associated with an image, and bundle it with the raw data, hence the name, from the sensor. This novel approach to images provides some drastic advantages after a photo is taken. Rather than work with values like red, green and blue, and guessed values like saturation, image editing software, like Adobe's Photoshop for instance, can edit the raw data from the camera, allowing for incredible adjustments with no loss of image quality.

 
Some refer to the RAW image format as a digital negative. In traditional film photography, negatives aren't usable as images on their own, but instead need to have light projected on to photographic paper to create a usable image. Likewise, RAW images have all the data necessary to create a usable image, but inherantly aren't an image unto themselves. RAW images, like traditional negatives, can contain more color information than can be reproduced in a traditional image, allowing for additional potential effects, or extreme detail.

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