New answers tagged image-review
I think that using the Neutral style and configuring the camera to use Adobe RGB instead of sRGB would give the closes possible representation for the "original RAW", but it's actually not anywhere near. And depending on the RAW processor you use, it could still be very different (LR process RAWs very differently than the Canon software, and so on). Anyway, ...
Your best option is probably using the "Neutral" picture style, this will apply minimum processing with a flat tone curve and no sharpening. This will give you the closest thing to a raw histogram available in-camera but it will make the jpeg look dull and lifeless - so you'll lose the ability to use the jpeg and preview for anything except judging focus.
You can use Magic Lantern to display RAW histogram in live view and image review. Head over to http://www.magiclantern.fm and download the version available for your camera. The installation instructions are different for each camera and can be found in their forums. In order to view RAW histogram in the preview, you could shoot with the technicolor ...
You can't view a RAW image, because a RAW file is not an image, it is a set of monochrome luminance values. When the data is converted to RGB using demosaicing certain settings such as contrast, saturation, etc. are applied. There has to be a value for those settings. You are much better off learning to use the histogram (also drawn from the JPEG preview) to ...
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