Retouching a RAW capture as much as possible before finishing the photograph in Photoshop is a best practice. RAW files contain all of the data that the camera was able to record of a scene, without a gamma curve imposed. In other words the RAW photo is pure, unaltered image info along with a color look up table (LUT) telling the RAW processor what color each pixel is on the sensor. Edits in Camera Raw are non-destructive. They provide the highest quality image to hand off to Photoshop. For instance it is much better to darken a sky of a RAW file in Camera Raw than it is to the Camera Raw Filter on pixels in Photoshop.
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