A jpeg file storage is a lossy compression technique for color images. Jpeg can reduce file sizes by 5% of their normal size. To upload work from Photoshop to WordPress the file has to be a Jpeg to work.
A raw file is the image that is seen by the camera's sensor. Like an unprocessed film. If you shoot in a raw it allows you to process the image to your liking. A way of adjusting the image is by opening photoshop with your image and adobe camera raw will open.
From here you can adjust values like the exposure or the temperature. If you move the exposure slider the result will be the image is reflected.
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