RAW is normally only used when additional computer processing is intended. However, raw has numerous advantages over JPEG such as:: - 
  •  Higher image quality. The pixel value are more accurate and less posterization
  •  Bypassing of undesired steps in the camera’s processing,including sharpening and noise reduction
  • The maximum amount of image detail compared the JPEG images. Raw image typically lossless compression, but JPEG image typically save using a lossy compression format.
  • Finer control. Allow us to manipulate more parameter by using RAW conversion software(such as lightness,white balance, hue etc..) and do so with greater variability.
  • More precisely highlight,shadows and saturated color.
  • The color space can be set to whatever is desired..
  • Different demosaicing algorithms can be used.
  • The contents of raw files include more information, and potentially higher quality, than the converted results, in which the rendering parameters are fixed, the color gamut is clipped, and there may be quantization and compression artifacts.
  • Large transformations of the data, such as increasing the exposure of a dramatically under-exposed photo, result in less visible artifacts when done from raw data than when done from already rendered image files. Raw data leave more scope for both corrections and artistic manipulations, without resulting in images with visible flaws such as Posterization.

Follow this advice if want to spend less time editing picture in front the computer by shot using high-quality JPEG Setting: - 
  • Color space – keep Adobe RGB for maximum compatibility when it comes to printing and sharing your photo
  • Sharpening – try it out on various settings to get sharp and clear image on the computer without harsh pixellation on finer detail.
  • Saturation – make sure not make to far when ramp up the color saturation.
  • Hue - Some cameras have more adjustment than others in the JPEG processing menu,but this is on you will want to leave unchanged as it alters the hue of the color spectrum and can throw color way off.
  • Contrast – this is one adjustment can make in digital darkroom to boost impact, make sure you wake the setting up for really deep blacks and bright highlights in your JPEGs
  • Brightness – Leave it alone at the default setting. Images can appear washed out or suffer lack of contrast otherwise,
A well set-up camera taking lightly compressed JPEGs with the color and sharpening setting tweaked for maximum impact will result in minimum editing.  

Source: Digital Camera, page 47, issue 42, June 2009


p/s: you can read more about RAW and JPEG by clicking this website.

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