With Canon 650D (and presumably all the other Canon), I noticed that the picture style and full JPG processing is used to generate a review JPEG which is what the camera actually reads when reviewing images through the LCD (and actually, most RAW capable image viewers are using this thumbnail as well).
The problem is, assessing the image through this review JPG and its histogram which has varying degrees of contrast, saturation and exposure tweaks as well as a tone curve and other processing elements I just have no idea about, has resulting in my misjuding of the exposure in the RAW file, leading to over/under exposed images. Clearly these embedded JPG have their benefits; the camera need not reprocess the RAW to show you the review, when the camera gets it roughly right you can be lazy and just extract the JPG and use that.
So, how can I get my camera to show me something in the review image and histogram that is as close as possible to the actual RAW data I will have to work with?
Answer
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 cinestyle picture style, or any other 'flat' profile.
Magic Lantern also has a ton of other features that will aid you in setting the right exposure, like zebras, warning dots on the histogram and an auto-ETTR mode (http://en.wikipedia.org/wiki/Exposing_to_the_right). It is slightly complicated, but definitely worth exploring.
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